Dave, I believe I’ve figured it out. Your channel feels like you’re my neighbor who I can visit whenever I’d like, to see what wild and interesting experiments he’s been up to 😂 It’s awesome, I’ve learned/applied so much from your videos. Thanks for sharing with us.
This popped up in my shorts feed, thanks for the laugh. Reminds me of the time we we're learning in class about magnetic field sensors and the course instructions explicitly said "Don't use the higher voltage connection, it'll spin too fast and launch things across the lab." Naturally... I definitely did use the high voltage power supply... for science...
mr Dave your content is quite entertaining, mixing teaching w/ fun is a special kind of talent. we really appreciate you sharing your expertise... wish you all the best to you and your family.
😂 cool demonstration..I would love to see Dave and Rog Mogale collaborate on a project. They are definitely two of the most eclectic minds in the business
I've got a group of nichrome elements set in a big drum of cooking oil that can be series / paralleled in to a number of different (stereo) impedances. Has the advantage that the impedance stays fairly constant as the nichrome itself doesn't heat up much itself. When you really thump a big amp in to it you can fry chips ;)
i'd read a story about someone doing something like this decades ago when they needed a 50hz electric organ to work with the 60hz power of the country they were touring in (or vice versa). cool to see it in action lol
Love the video, 24vdc is unfun when it bites you, always make sure your welder ground clamp is a better path to ground than your arm. Great improvised VFD variable frequency transistor inverter drive made from the amp and tone generator.
I still think it's mad how unbelievably powerful amps are these's days and at a tiny size. I've still got NOT so fond memories of lugging around massive heavy amp rack's with HUGE toroids in ☹️ I still to this day, can't get my head around it. But that's technology for ya! 👍🏻
I did this once with an Yamaha T5n amp. I also hooked it to a 8:1 step-up transformer. then stuck those wire leads into a pan of water and watched the sparks fly with the synthesizer music
Reminds me of the old electro-voice promo for the P series amps, 50hz tone at 0dbu into a p3000 in bridge mode with a 3000w angle grinder attached to the bridged output.
5:43 "What I forgot to metion here, is the NL-4 to to romex adapter that I've got running around power this duplex outlet, which could come in handy, I can now power numerous household appliances off this power amp, should I choose to..." sounds like fun 😂 Maybe try using a Powersoft X4 or X4L four channel amp as 3 phase VFD for motor someday... 😂
Your wall voltage vs shock factor is sort of correct, the point about RMS vs peak to peak AC voltage is well taken, but you're missing a piece. Your body has some significant capacitance, and this works to help block DC from carrying current through your body, the same way it does in a circuit. However, AC is not blocked in the same way and thus you carry more current and feel more pain.
Great point. I looked up human body capacitance and it seems to be in the 10s to 100s of pico farads. So the frequency of the electricity would be an important factor as well. I guess the question is, which would zap ya more, 120 volts DC which is straight 120 volts or 120 volts AC which has peak voltages of 340 volts. I am guessing the 340 would bite more but 340 DC vs 120V ac, I would guess the DC would bite more. Best way to find out is test!! Any volunteers?
@@DaveRat Electroboom already has! Do a search for something like "AC vs DC pain Electroboom" and there are a few where he tried different voltages and frequencies on his tongue. I think he did push pretty high on DC but couldn't get anywhere near it with AC, and you're correct, different AC frequencies did hurt differently.
Did not watch but here is a quote from the electroboom in the video description that seems to align with what I would expect. Also he seems to not be aware that peak voltage is 2x rms x 1.41. "Now as I show in my video, the AC seems to hurt at RMS levels half of the DC. But you should know that RMS means the effective AC voltage, meaning that from power consumption point of view an AC signal with specific RMS value is equal to the same value DC signal. But the actual peak of the AC voltage is the RMS value times 1.41. So a 6.5V RMS means that it is oscillating around 0V with 9.16V peaks in a sine wave form."
As a little additional test, you’ve also showed that powersoft amps allow grounded output channels. Your scope automatically shorts the ground of the probe to earth 😜
Hey hey Ben! The toaster is an 8 ohm load. My next vid series will be on amp power and released to members. Just did the intro vid now and posting tonight
your skin is the key . It takes about 42v to overcome the resistance of ur skin . But if ur hands were wet wich would aid in the power transfer to ur body and in that case 12v is plenty to give you a good shock
had anything to do with Wharfedale pro amplifiers the mp2800 £500 1400 Watts per channel 2 ohms bridged DSP looks good amplifier especially for the price 12 volts AC or dc doesn't have the carrying capacity to penetrate the skin resistance
Have not dealt with the wharfdale amps. Yes, its harder to feel 9 or 12 volts but can be felt in sensitive areas and some people are super sensitive to voltages. I knew a gal that could feel the electric output from a microphone. I could talk into the mic an she could be at the far end of a mic cable and with her finger, tell me if the cable was plugged into the mic or not.
I’m of the understanding that a large proportion of the crown 10k monoblocks were sold into medical facilities to power precision medicine machines. I believe stable psu was the design intent.
Because the Amp tested is a 1u, it probably has a switching power supply? If so does this prove that the days of big toroidal transformers is a thing of the past? I am sure toast is not a sensitive as our ears and doesn't really care how the power is delivered but can our ears tell the difference? Thanks Dave, reminds me of cooking hot dogs with just two nails, some wire and a wall socket.
I am starting up a video series on amp testing and watts and will cover old vs new amps, how watts are not all delivered the same and loads more. As usual, I will post to members first and then make the videos public at a later date.
I’ve got an innovation. Run a matrix out from the console and as the band plays, make toast and you can sell it. This way we can actually taste what the song tastes like.
It’s strange how you can touch the negative and positive on a 12 V car battery and not feel anything yet drop an open end wrench across those two terminals and you get an instant arc welder
Yeah, that would work. The challenge is it is a non linear load, the resistance raises as the elements heat so wattage calcs would be a bit more complex.
Well, it's rated at 1800 watts but there is a 2 slices and 4 slice setting and I had it on 2 slice. So 900 watts. And since watts = volts x amps, dividing both sides by volts would be 900/120 = 7.5 amps. And since volts divided by amps= resistance, that calcs out as 120/7.5 = 16 ohms. Though the resistance of a heater element starts lower and raises with temp. But yes, about a 16 ohm load
Dave !!!!!!!!!!! you are such a crazy guy !! absolutely love what you do !! 🤣😍🤣😍🤣😍🤣😍🤣😍 … could you please run a hairdryer supplying it with 120 V Bohemian Rhapsody ??? … i want some „music in the air“ !!!! 🤪🤣🤪🤣🤪🤣🤪🤣🤪🤣
A 4 ohm load would dissipate roughly 4000W with a supply of 130vac. The toaster, like filament lights, will be a non-linear load resistance, dropping with heat. Did you happen to measure it or am I just getting too serious.
Ha1 All good., this is important stuff. The toaster is rated at 1800 watts so that calcs out to an 8 ohm load. But I am guessing the 1800 watts is when the switch is set to 4 toast slices and I had only 2 slice setting. So since the elements are in parallel, it should be a 16 ohm load and 900 watts with the elements fully heated. The load would be a lower resistance briefly while heating up.
Multiply the wall voltage times itself (voltage squared) and divide by the wattage listed on the toaster to get the resistance. The resistance will be lower at first till it gets hot but even a 2000 watt toaster would be 7.2 ohms. A 1000 watt toaster will be 14.4 ohms. So you should be fine
Excellent! With a VZ5000 run through a DX38 with 2 Linkwitz-Riley 24-dB/octave slopes (low pass) @ 16kH and HP @ 45Hz not only did I get even browning, I could feel it toasting through my buttKicker.
pictured here (and trust me, the grinder is way more difficult load than steady toaster is): www.prosoundnetwork.com/international/exit-stage-left-stuntman-martin-traut
Thank you and correct. Not sure what part you are referring but just to clarify: 120vac is rms. So it would 120 X 1.414 = 169.68 peak and 339.36 peak to peak
Hmmm, well that can be calculated for the wall voltage, it's an 1800 watt toaster at 120 volts, then it would be 15 amps, And 15 amps at 120 volts is surprisingly 8 ohms!
120V RMS is in fact ~170V peak, but can never be 340V. All though mathematically, peak to peak is (170- (-170) =340) the difference in tension never exceeds 170V because one of the lines is always 0V, the other one oscilates between +170 and -170V. Therefore there is no way to ever measure 340V
Hmmm, does that mean that one leg of a 170v fully rectified ac waveform would feel and shock exactly the same as a 170volt peak (340 volt p to p) waveform? Perhaps that is true, would need to test to find out. Or is it possible that the 340v swing from negative 170v to positive 170v has its own shock or impact value. I don't know the answer but I could see logic that supports both perspectives. If you look at the absolute value of the voltage differential to ground at any point in time, the two waveforms are exactly the same. What do ya think? Does a fully rectified leg of ac with a 170v peak voltage shock exactly the same as a non rectified 170v ac waveform? Like I said, I don't know though I tend to think that two differing signals are unlikely to have the exact same impact. Fun stuff!
@@DaveRat What matters for electric shock is the voltage difference at any given time (between you/the ground you stand on and what you touch or between two conductive items you happen to touch). It is not the swing over time (the shape of the voltage curve) that matters. So, if one side is ground potential (as a person standing on the ground), and *not* touching e.g. a charged capacitor that holds the potential far from ground potential, while the other side of the person touches a phase/line conductor of an AC supply with a grounded neutral, then the maximum difference at any given time will only be 'ground to peak', not 'peak to peak'.
So if I touch a high voltage DC wire with a positive voltage while not grounded, I won't get shocked. And then if I let go and immediately touch a high voltage wire of negative voltage voltage I also won't get shocked. The body instantly adapts to whatever voltage we touch, no shock? So what you are saying is that changes or swings in potential have no impact at all. Except with static electricity where we do get shocked and we are not grounded. Is that contradictory? At what voltage or potential levels does it transition from no impact to impact? Is it a certain voltage or is it gradually increasing? Have you tested this or is it a hypothesis? As you may realize from the videos I do, I am not one to accept things as facts easily without testing. I can say that DC feels different that ac in that I can feel the vibration of the ac vs the clamping sensation of DC when shocked beyond the initial bite. So I do know that the waveform does have an impact. Furthermore, the freq of the ac can be felt. What I don't know for sure is whether rectified ac feels the same as ac or whether it feels more intense or not. Also, whether a square wave give more shock that a sine wave. I would guess that the square wave would bit more with the quicker transition from extremes and added high frequency energy. But according to your explanation, a square wave would bit the exact same as a sine wave. Pondering a test!
@@DaveRat Static charge is in practice unavoidable (in the ungrounded scenario or thought experiment), but has no role if there is permanent connection that prevents a build-up of static charge. So the scenario gets simpler if the person is connected to the power source with a single connection we can choose to call "common/ground". Your example with DC will only result in static discharge chock. Once that discharge has settled, the shocking voltage is 0, as there is no circuit for an electric current. Grabbing a phase in one hand and a neutral/ground in the other hand, fed with a sinusoidal voltage, you will not feel the peak-to-peak voltage, just the instant voltage between the hands. There will not be charge left from one peak to the next.
@@DaveRat @Dave Rat The purpose was to explain why the presented case of sinusoidal AC voltage giving electric shock has no relation to a peak-to-peak voltage, but just the peak between the terminals. For "resistive loads", like a person getting a (potentially dangerously) good connection to 120 V RMS AC or higher, the current though the body is not related to peak-to-peak value of voltage, rather the RMS value at average and the peak voltage gives the peak current. >>So what you are saying is that changes or swings in potential have no impact at all. Not on peak current, no. Not in a way that makes a peak-to-peak measure relevant. I tried to say that the peak current is not determined by a peak-to-peak measure. It is the voltage across you body, which does not rise to 2*peak level. Sorry that was not clearly written. Electrically, the time between the peaks is waaaay longer than any effect of one peak takes to die out. Therefore I predict that one peak does not affect the next, regardind the strength of the the shock. Not enough to double the sensation of a shock. I have not tested this theory. :-) When getting zapped 120 times a second, the next zap may not feel 2 times worse just because the current flows in an opposite direction the next time. The peak and average current stays the same for each zap, unrelated of polarity and *un-smoothed* rectification.
Hi Dave, can you recommend or introduce a new headphone monitor? It’s been a long time since you introduced the headset last time, your loyal fan Zhang
Regarding electric shock and the resistance of a human body. The skin is the key,and its resistance varies a lot. See www.ncbi.nlm.nih.gov/pmc/articles/PMC2763825/ (second hit on DuckDuckGo) "A calloused, dry hand may have more than 100,000 Ω because of a thick outer layer of dead cells in the stratum corneum. The internal body resistance is about 300 Ω, being related to the wet, relatively salty tissues beneath the skin. The skin resistance can be effectively bypassed if there is skin breakdown from high voltage, a cut, a deep abrasion, or immersion in water " Skin "allows more current to flow if a voltage is changing rapidly." "It is the current that determines physiological effects" "With alternating current, if the current level is high enough, there will be a feeling of electric shock as long as contact is made. " "In contrast, with direct current, there is a feeling of shock only when the circuit is made or broken unless the voltage is relatively high"
This makes sense and is what makes me think the max voltage swing is a factor in addition to the voltage to ground. And why rectified ac will feel different than non rectified ac. If the max voltage swing has zero impact then rectified ac would feel exactly like ac. But rectified ac is closer to dc which feels different than ac. If the voltage swing is a factor in what we feel, then the 170 voltage swing of rectified ac could feel different than the 340 voltage swing of non rectified ac. Even though both are the same 170 to ground. I believe the info you are presenting supports that as probable.
Authentic French toast must be toasted at ~230V @50Hz. Sounds warm, with buttery midrange and crispy highs. The golden brown sound everyone wants.
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Dave, I believe I’ve figured it out. Your channel feels like you’re my neighbor who I can visit whenever I’d like, to see what wild and interesting experiments he’s been up to 😂 It’s awesome, I’ve learned/applied so much from your videos. Thanks for sharing with us.
Thank you Desmond!
I feel pretty strongly that this is the best content on the internet!
Awesome and thank you! Please share!
Pensado got nothing on Rat!
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"This is gonna be a variable frequency toast" - lol
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This popped up in my shorts feed, thanks for the laugh.
Reminds me of the time we we're learning in class about magnetic field sensors and the course instructions explicitly said "Don't use the higher voltage connection, it'll spin too fast and launch things across the lab."
Naturally... I definitely did use the high voltage power supply... for science...
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When you said you were going to toast an amp; I had something else in mind! Great video; great amp too.
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Probably the best pro audio video ever. Thanks
Awesome!
One of the finest demonstrations I have seen on UA-cam!
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This was awesome Dave! Thanks my friend!!
Thank you Karlos!
This is by far the best video i have ever seen on UA-cam!! Keep the toaster on and see how long it take to fry an egg on the amp 😂
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We kneaded this video.
Loads of fun!
Just love your site. Real world. Many thanks.
Very cool and thank you Frank!!!
Dave is fantastic. I love all these videos he's been putting out lately!
So cool thank you!
mr Dave your content is quite entertaining, mixing teaching w/ fun is a special kind of talent. we really appreciate you sharing your expertise...
wish you all the best to you and your family.
Thank you Durox!
This is the best amp test ever!!! 😂👍
Awesome and thank you!
April 1st is here already? Nice, Dave!
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For your next toast video we need a live band playing.... providing some "jam" for the toast!
Thats funny!!!
😂 cool demonstration..I would love to see Dave and Rog Mogale collaborate on a project. They are definitely two of the most eclectic minds in the business
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Relieved the toaster made it, that's some quality gear right there!
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Lol Dave, you’re a mad scientist
This was not what I was expecting xD
Ha, fun!
I've got a group of nichrome elements set in a big drum of cooking oil that can be series / paralleled in to a number of different (stereo) impedances. Has the advantage that the impedance stays fairly constant as the nichrome itself doesn't heat up much itself. When you really thump a big amp in to it you can fry chips ;)
Excellent!
I think this was a test in "can I get away with eating my breakfast on camera?"
Yes!
This guy is crazy... and that's why he does crazy good videos !!
👍 Thank you!!
i'd read a story about someone doing something like this decades ago when they needed a 50hz electric organ to work with the 60hz power of the country they were touring in (or vice versa). cool to see it in action lol
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Boston Light and Sound used to put 60hz through big old EV amps to run film projection equipment overseas!
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Love the video, 24vdc is unfun when it bites you, always make sure your welder ground clamp is a better path to ground than your arm.
Great improvised VFD variable frequency transistor inverter drive made from the amp and tone generator.
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I still think it's mad how unbelievably powerful amps are these's days and at a tiny size. I've still got NOT so fond memories of lugging around massive heavy amp rack's with HUGE toroids in ☹️
I still to this day, can't get my head around it.
But that's technology for ya! 👍🏻
Yes, agreed, and doing a vid now that helps explain how they accomplish it.
One of your best Dave ! 😂
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Good crunchy sounds
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I remember years ago Lab Gruppen was using a FP6400 to arc weld outside at Namm.
love that
Dave, you should have a Tshirt with ""COOL COOL" writen on it, its your trademark.
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Pizza Pizza, :)
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@@peehandshihtzu
Pizza Rat ...
@@FOH3663 Little Ceasers. :)
Hell yeah ! that was good ! Loved it !
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I always plug christmas lights into my amplifier outs and the different kinds of bulbs flash at different frequencies! And i get the music too, Fun!
Great idea and fun!
Too funny. Way to go Dave. Have Audiophiles ask you if your toast had pace, rhythm, micro and macro dynamics or thermal compression?
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"I'm gonna see what 80hertz toast tastes like" lol
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the guys at EMI (abbey road) did something similar to varispeed their big studers, for the beatles mainly.
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Cooking corner with Dave Rat 🐀 lol love it!
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I did this once with an Yamaha T5n amp. I also hooked it to a 8:1 step-up transformer. then stuck those wire leads into a pan of water and watched the sparks fly with the synthesizer music
Great Stuff!
Nice experiment. 😊😊
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Reminds me of the old electro-voice promo for the P series amps, 50hz tone at 0dbu into a p3000 in bridge mode with a 3000w angle grinder attached to the bridged output.
Love that!
🤣🤣... was this one Sammy's idea... had me cracking up the whole time
Awesome! I wish Sammy was in town to join me for it.
5:43 "What I forgot to metion here, is the NL-4 to to romex adapter that I've got running around power this duplex outlet, which could come in handy, I can now power numerous household appliances off this power amp, should I choose to..." sounds like fun 😂
Maybe try using a Powersoft X4 or X4L four channel amp as 3 phase VFD for motor someday... 😂
👍 yes, all kinds of fun to have
hahahaha wow, I so needed this kind of humour today, thanks Dave.
Awesome, thank you Emmanuel.
Haven't laughed this hard in a while! And I KNEW it had to be sourdough!
Awesome and thank you Todd!
Love the double meaning of "toasts" ...... !
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Very proper over-under buttering technique ....
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I have two T302's right now, I'd love a T902/4. Don't need all that power but I want it.
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Your wall voltage vs shock factor is sort of correct, the point about RMS vs peak to peak AC voltage is well taken, but you're missing a piece. Your body has some significant capacitance, and this works to help block DC from carrying current through your body, the same way it does in a circuit. However, AC is not blocked in the same way and thus you carry more current and feel more pain.
Great point. I looked up human body capacitance and it seems to be in the 10s to 100s of pico farads. So the frequency of the electricity would be an important factor as well.
I guess the question is, which would zap ya more, 120 volts DC which is straight 120 volts or 120 volts AC which has peak voltages of 340 volts. I am guessing the 340 would bite more but 340 DC vs 120V ac, I would guess the DC would bite more. Best way to find out is test!! Any volunteers?
@@DaveRat Electroboom already has! Do a search for something like "AC vs DC pain Electroboom" and there are a few where he tried different voltages and frequencies on his tongue. I think he did push pretty high on DC but couldn't get anywhere near it with AC, and you're correct, different AC frequencies did hurt differently.
Did not watch but here is a quote from the electroboom in the video description that seems to align with what I would expect. Also he seems to not be aware that peak voltage is 2x rms x 1.41.
"Now as I show in my video, the AC seems to hurt at RMS levels half of the DC. But you should know that RMS means the effective AC voltage, meaning that from power consumption point of view an AC signal with specific RMS value is equal to the same value DC signal. But the actual peak of the AC voltage is the RMS value times 1.41. So a 6.5V RMS means that it is oscillating around 0V with 9.16V peaks in a sine wave form."
As a little additional test, you’ve also showed that powersoft amps allow grounded output channels. Your scope automatically shorts the ground of the probe to earth 😜
Ha and yes, I tested that before connecting. Observant!
You absolutely must publish this on Scientific American, have it peer reviewed. I don't see who would oppose your Nobel nomination!
Ha! Thank you Tommi!
Welcome to Dave Rat's cooking channel. Next week grilled sea bream with lemon and creme brulé 🤣🤣🤣
Yes! Fun
You Sir are hilarious! :D
Awesome, thank you!
This made me laugh, thanks 😀
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this is so cool !!!!
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Amazing. A great improvement upon PARCan Pizza 😅
My question is, what were the amp input/output meters doing at the time! How much headroom was left 😂
Hey hey Ben! The toaster is an 8 ohm load. My next vid series will be on amp power and released to members. Just did the intro vid now and posting tonight
Dave Rat meets Photonicinduction lol.
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I dream of the Dave Rat and Electroboom collab
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your skin is the key . It takes about 42v to overcome the resistance of ur skin . But if ur hands were wet wich would aid in the power transfer to ur body and in that case 12v is plenty to give you a good shock
And also the current matters. Phantom power has a current limiting resistor that makes it's 48volts deliver way less power than a 9v battery or 5v USB
Cool Cool
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had anything to do with Wharfedale pro amplifiers the mp2800 £500 1400 Watts per channel 2 ohms bridged DSP looks good amplifier especially for the price
12 volts AC or dc doesn't have the carrying capacity to penetrate the skin resistance
Have not dealt with the wharfdale amps. Yes, its harder to feel 9 or 12 volts but can be felt in sensitive areas and some people are super sensitive to voltages. I knew a gal that could feel the electric output from a microphone. I could talk into the mic an she could be at the far end of a mic cable and with her finger, tell me if the cable was plugged into the mic or not.
I’m of the understanding that a large proportion of the crown 10k monoblocks were sold into medical facilities to power precision medicine machines. I believe stable psu was the design intent.
Interesting! I worked at Hughes aircraft and we had McIntosh 2300 amps that we used to test power supplies by creating ac voltages
Because the Amp tested is a 1u, it probably has a switching power supply? If so does this prove that the days of big toroidal transformers is a thing of the past? I am sure toast is not a sensitive as our ears and doesn't really care how the power is delivered but can our ears tell the difference? Thanks Dave, reminds me of cooking hot dogs with just two nails, some wire and a wall socket.
I am starting up a video series on amp testing and watts and will cover old vs new amps, how watts are not all delivered the same and loads more. As usual, I will post to members first and then make the videos public at a later date.
Well actually you can drive the amp & the toaster afterwards with music. For some dynamic flavor of course. ^^
This test made me hungry.
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no, no.. you need 4 pieces of sourdough for proper impedance matching! So would you say it's powerSoft or powerCrunchy?
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You are a seriously funny guy..
Ha, thank you!
Great test ,if you can add a Amp meter will be good also ..
I will ponder that
I’ve got an innovation.
Run a matrix out from the console and as the band plays, make toast and you can sell it.
This way we can actually taste what the song tastes like.
Metalitoast, red hot toasty peppers
It’s strange how you can touch the negative and positive on a 12 V car battery and not feel anything yet drop an open end wrench across those two terminals and you get an instant arc welder
Right! Looks and is safe unless you are made of metal, it is not safe at all!
A toaster load , great idea !!!
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power soft would have to apply for a FDA lic now... 🤣😂
I'm building a power amp load/hotplate now so we can really get into some fun stuff
Does the 4 bay toaster give you a cardiod pattern? I didn't see you set any delays....
Quadrophonic instead of stereo toast
MY FAV BREAD RYE
Love the rye too!
Can I use toaster as load for testing amplifier? Or what can be used for load, for testing 1000-2000w subwoofer amplifiers?
Yeah, that would work. The challenge is it is a non linear load, the resistance raises as the elements heat so wattage calcs would be a bit more complex.
45000 watts?! Wow that thing packs some serious punch!
Four channels of 5000 watts so 20,000 watts in a single each space.
What was the DC resistance or the impedance of the toaster?
Well, it's rated at 1800 watts but there is a 2 slices and 4 slice setting and I had it on 2 slice. So 900 watts. And since watts = volts x amps, dividing both sides by volts would be 900/120 = 7.5 amps. And since volts divided by amps= resistance, that calcs out as 120/7.5 = 16 ohms.
Though the resistance of a heater element starts lower and raises with temp. But yes, about a 16 ohm load
I was born to watch this video
Big smile!
Dave !!!!!!!!!!!
you are such a crazy guy !!
absolutely love what you do !!
🤣😍🤣😍🤣😍🤣😍🤣😍
… could you please run a hairdryer supplying it with 120 V Bohemian Rhapsody ???
… i want some „music in the air“ !!!!
🤪🤣🤪🤣🤪🤣🤪🤣🤪🤣
That's funny and a good idea
So what EQ do you use for the toaster?
Oh my! I have not made musical toast yet and have not tried differing EQs. This could be a culinary breakthrough!
Well that was toasty!
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A 4 ohm load would dissipate roughly 4000W with a supply of 130vac. The toaster, like filament lights, will be a non-linear load resistance, dropping with heat. Did you happen to measure it or am I just getting too serious.
Ha1 All good., this is important stuff. The toaster is rated at 1800 watts so that calcs out to an 8 ohm load. But I am guessing the 1800 watts is when the switch is set to 4 toast slices and I had only 2 slice setting. So since the elements are in parallel, it should be a 16 ohm load and 900 watts with the elements fully heated. The load would be a lower resistance briefly while heating up.
crazy man)))))
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Dave. Is this a class D amp? I couldn't find this info on Powersoft's web sight.
Look up T902 and T904, they are on the site
Did you calculate the ohm load of the toaster before you started? I can’t afford to burn up my amp with a 1 ohm load.
Multiply the wall voltage times itself (voltage squared) and divide by the wattage listed on the toaster to get the resistance.
The resistance will be lower at first till it gets hot but even a 2000 watt toaster would be 7.2 ohms. A 1000 watt toaster will be 14.4 ohms.
So you should be fine
Excellent! With a VZ5000 run through a DX38 with 2 Linkwitz-Riley 24-dB/octave slopes (low pass) @ 16kH and HP @ 45Hz not only did I get even browning, I could feel it toasting through my buttKicker.
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Is that toast mono?
Yes, 1 to 4 mono toasts with a choice of single or double sided dispersion
Please do more amps ,crown, lab , qsc anything
I am starting a new series on amps and watts. It will be for members first and eventually released to the public side as well
Great
Keep on Toasting
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Nextime try to power a grinder or a jackhammer as Martin Traut did years ago with DYNACORD amps. BTW have you ever toasted with Dynacord TGX or IPX?
pictured here (and trust me, the grinder is way more difficult load than steady toaster is):
www.prosoundnetwork.com/international/exit-stage-left-stuntman-martin-traut
Not yet but will ponder some other tests.
Waiting to see the marketing material brochure 'MAKES VARIABLE FREQUENCY TOAST'
And I also need to setup and test toast made with a musical signal!
Maybe you need to use it to power another power amp. You might create a black hole though, so be careful with your new found super powers
I'm up to do that!
Dave, could you please put to rest the 440Hz vs. 432 Hz toast debate?
Excellent topic and yes, settling that debate once and for all is top o the list!
AC voltage is measured peak to peak. 120vac is not really 240vac. Good content, just a little error 😁
Thank you and correct. Not sure what part you are referring but just to clarify:
120vac is rms. So it would 120 X 1.414 = 169.68 peak and 339.36 peak to peak
So what ohm load does the toaster measure out to?....
There's a big difference between a 100 ohm load and a 4 ohm load....lol
Hmmm, well that can be calculated for the wall voltage, it's an 1800 watt toaster at 120 volts, then it would be 15 amps,
And 15 amps at 120 volts is surprisingly 8 ohms!
@@DaveRat So you could parallel two of them to get the 4 ohms that the amp is rated for. And then there's the other channel.
Yes and no. I will be doing some vids soon on amp power and how all watts are not created equal
@@DaveRat Well, I guess I'll have to wait for those vids to see what you mean.
120V RMS is in fact ~170V peak, but can never be 340V. All though mathematically, peak to peak is (170- (-170) =340) the difference in tension never exceeds 170V because one of the lines is always 0V, the other one oscilates between +170 and -170V. Therefore there is no way to ever measure 340V
Hmmm, does that mean that one leg of a 170v fully rectified ac waveform would feel and shock exactly the same as a 170volt peak (340 volt p to p) waveform?
Perhaps that is true, would need to test to find out.
Or is it possible that the 340v swing from negative 170v to positive 170v has its own shock or impact value. I don't know the answer but I could see logic that supports both perspectives.
If you look at the absolute value of the voltage differential to ground at any point in time, the two waveforms are exactly the same.
What do ya think? Does a fully rectified leg of ac with a 170v peak voltage shock exactly the same as a non rectified 170v ac waveform?
Like I said, I don't know though I tend to think that two differing signals are unlikely to have the exact same impact.
Fun stuff!
@@DaveRat What matters for electric shock is the voltage difference at any given time (between you/the ground you stand on and what you touch or between two conductive items you happen to touch).
It is not the swing over time (the shape of the voltage curve) that matters.
So, if one side is ground potential (as a person standing on the ground), and *not* touching e.g. a charged capacitor that holds the potential far from ground potential, while the other side of the person touches a phase/line conductor of an AC supply with a grounded neutral, then the maximum difference at any given time will only be 'ground to peak', not 'peak to peak'.
So if I touch a high voltage DC wire with a positive voltage while not grounded, I won't get shocked. And then if I let go and immediately touch a high voltage wire of negative voltage voltage I also won't get shocked.
The body instantly adapts to whatever voltage we touch, no shock?
So what you are saying is that changes or swings in potential have no impact at all.
Except with static electricity where we do get shocked and we are not grounded.
Is that contradictory? At what voltage or potential levels does it transition from no impact to impact? Is it a certain voltage or is it gradually increasing?
Have you tested this or is it a hypothesis?
As you may realize from the videos I do, I am not one to accept things as facts easily without testing.
I can say that DC feels different that ac in that I can feel the vibration of the ac vs the clamping sensation of DC when shocked beyond the initial bite. So I do know that the waveform does have an impact. Furthermore, the freq of the ac can be felt.
What I don't know for sure is whether rectified ac feels the same as ac or whether it feels more intense or not. Also, whether a square wave give more shock that a sine wave. I would guess that the square wave would bit more with the quicker transition from extremes and added high frequency energy. But according to your explanation, a square wave would bit the exact same as a sine wave.
Pondering a test!
@@DaveRat Static charge is in practice unavoidable (in the ungrounded scenario or thought experiment), but has no role if there is permanent connection that prevents a build-up of static charge. So the scenario gets simpler if the person is connected to the power source with a single connection we can choose to call "common/ground".
Your example with DC will only result in static discharge chock. Once that discharge has settled, the shocking voltage is 0, as there is no circuit for an electric current.
Grabbing a phase in one hand and a neutral/ground in the other hand, fed with a sinusoidal voltage, you will not feel the peak-to-peak voltage, just the instant voltage between the hands. There will not be charge left from one peak to the next.
@@DaveRat @Dave Rat The purpose was to explain why the presented case of sinusoidal AC voltage giving electric shock has no relation to a peak-to-peak voltage, but just the peak between the terminals.
For "resistive loads", like a person getting a (potentially dangerously) good connection to 120 V RMS AC or higher, the current though the body is not related to peak-to-peak value of voltage, rather the RMS value at average and the peak voltage gives the peak current.
>>So what you are saying is that changes or swings in potential have no impact at all.
Not on peak current, no. Not in a way that makes a peak-to-peak measure relevant.
I tried to say that the peak current is not determined by a peak-to-peak measure. It is the voltage across you body, which does not rise to 2*peak level.
Sorry that was not clearly written.
Electrically, the time between the peaks is waaaay longer than any effect of one peak takes to die out. Therefore I predict that one peak does not affect the next, regardind the strength of the the shock. Not enough to double the sensation of a shock.
I have not tested this theory. :-)
When getting zapped 120 times a second, the next zap may not feel 2 times worse just because the current flows in an opposite direction the next time. The peak and average current stays the same for each zap, unrelated of polarity and *un-smoothed* rectification.
Hi Dave, can you recommend or introduce a new headphone monitor? It’s been a long time since you introduced the headset last time, your loyal fan Zhang
Its been a while since I worked on headphone comparisons. I will hope to do more at some point
Will it do 240v @ 50hz, might be handy when a band from Europe turn up.
We could bridge mono and and should work.
so that's how "feedback" sounds on a T902 @10:28 :}
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Regarding electric shock and the resistance of a human body. The skin is the key,and its resistance varies a lot.
See www.ncbi.nlm.nih.gov/pmc/articles/PMC2763825/ (second hit on DuckDuckGo)
"A calloused, dry hand may have more than 100,000 Ω because of a thick outer layer of dead cells in the stratum corneum. The internal body resistance is about 300 Ω, being related to the wet, relatively salty tissues beneath the skin. The skin resistance can be effectively bypassed if there is skin breakdown from high voltage, a cut, a deep abrasion, or immersion in water "
Skin "allows more current to flow if a voltage is changing rapidly."
"It is the current that determines physiological effects"
"With alternating current, if the current level is high enough, there will be a feeling of electric shock as long as contact is made. "
"In contrast, with direct current, there is a feeling of shock only when the circuit is made or broken unless the voltage is relatively high"
This makes sense and is what makes me think the max voltage swing is a factor in addition to the voltage to ground. And why rectified ac will feel different than non rectified ac.
If the max voltage swing has zero impact then rectified ac would feel exactly like ac.
But rectified ac is closer to dc which feels different than ac.
If the voltage swing is a factor in what we feel, then the 170 voltage swing of rectified ac could feel different than the 340 voltage swing of non rectified ac. Even though both are the same 170 to ground.
I believe the info you are presenting supports that as probable.
This is going to be RTA Rat Toast Audio lol
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Get two toaster ovens and toast in stereo. You could even run two ovens and call them sub toasters.
That's a good idea!
Do you also sell toasters?
Great Idea!!