As a bass player I've had such a problem lately because of a cheap PSU causing an annoying electrical hiss at high volume, which is amplified when I use distortion pedals, and I almost always do. Thanks a lot for this video!
After 1 minute of the german version of this video i switched to english - even i am a german native speaker, this german voice is so unfamiliar to me :-)
Thanks for a great explanation. I'm a physicist / engineer. This was always a mystery to me, especially the common mode vs differential mode. You really cleared it up.
You definitely raised up the bar with this video. It kept me absorbed for its whole length (despite I was in the office). Thanks a lot, keep bringing more videos like this one.
Thanks for bringing up this very important topic. In most of the maker designs we see here on UA-cam and elsewhere, EMC is never mentioned. Yet it affects us all on a daily basis, from interference on audio to degraded WiFi or other equipment performance. Moreover, you can even, unknowingly, affect your neighbours. I have friends who have tracked down interference on audio to faulty/cheap/nasty SMPS several houses away!
I've used Wurth filter components in my professional life, and they have been very good. I'd also recommend Fair-rite for ferrite devices. For this sort of interference, adding a filter will get the job done but adds cost. If this was a production situation, the first goal is always to fix the device emitting the noise. For the hobbyist getting their first exposure to EMC, this is a fine introduction.
This video gave me better knowledge about EMC topic as compared to my book on the same subject... Loved your video and thank you for making this topic memorable for me
You are a Legend! I owe my tinkering life to Folks like you who pour their knowledge and energy into great Production and videos that feel like hanging out with a Friend who is a Pro. Thank you
Great explanation. This is a solid reference for future research on my EMC problems. This video go straight on my electronics playlist. Thank you very much for sharing this.
Great intermediate video into the world of EMC!. A good thing to remember is that signal/power integrity/quality are inversely releated to EMC problems, if you have a well routed signal (tight ground return, matched impedances, length matching on differential pairs, etc), then your signal integrity will be solid plus that particular signal will likely be EMC compliant and immune to external interference. Win-win situations like that are certainly possible and desireable. If you can catch them early in the design phase (schematic & layout) then you'll be saving yourself alot of frustration down the road. Recommendation to definitely do a video on ESD / EFT in the future as that's another common EMC problem that EEs must face when designing products.
Coincidentally, what you just demonstrated is my new job. I spent 20 years doing production testing and troubleshooting of avionics, and now I'm doing EMI testing for new designs. 2 months ago, I had never even heard of such things as LISNs.
Big advantage to live in the same country as Würth, you can visit the facilities, wonderful kit!!!! very beatiful, I really like this type of advanced content
@GreatScott You know, after I watched this, I went to Würth Elektronik, and got the sample(s), and I didnt expect it to be so robust, and everything, I did mention you, and how what you were doing here, is what I wanted to do, and I still didnt think they would send anything at all, from 10th today the 15th of Nov(as there was no delivery date or where it was really coming from nor a tracking number) , holy shnitzel pretzel! HOnestly I thought the package or box anything would have been smaller like literally half the size, they looked so small on the screen, both on here and the website. Enough for 10 of these boards, and 3 are gonna be used to see if I can fix my problem, and maybe even my work problem that will require 3 there as well, 6 already gone... And they are DAMN GOOD quality too! Not the cheap knock offs that one would get with samples, heardy and robust, and damn good case too! Thank you so much GS! I will damn well be ordering other things from them in the future... I hope you get something outa the referrals or something even more! Even after i buy more!
You are the only engineer I know capable of oppressing noises, you are the savior please help us mitigate the EMI and build a better world my lord. 7:26
At beginning (1:00) there is noise when LED strip is put at 50%. In your final tests, the LED strip doesn't seem to be at 50%. If true, it is not a fair comparison as 50% would generate more noise. Never the less, it is still a great video on how to remove EMC.
@2:17 this was extremely helpful! I've been trying to figure out how to set up an AC to DC power supply and understood the rectifier half, but not the transformer part. Need more vids like this
Wow talk about good timing. I recently got an HDMI audio splitter from Amazon and it seems ever since I plugged it in my speakers have been making similar noises. Not sure I can manage building a filter (even with a kit 😅) but I was considering trying out some snap ferrites. Thanks for the interesting and informative video!
Your English is better than my Deutsch ever was, but it was wonderful seeing the other version for a moment. Could you please include a link to your "other" versions of the episodes in your descriptions? I'd love to hear both, frankly as my fluency is gone and I'd like to try a little. Since I grok the content, I expect it'll be more approachable. (Kinda like setting an alternate language on my phone or FB.) Thank you for your wonderful series of very interesting and educational content. tschüß
On the subject of audio. Did you happen to try to connect helmet intercom to action camera? I've seen you trying an intercom before (BTW that video motivated me to get one, thank you, best riding related decision ever). I have this funky setup where I connect two microphones to the camera via 3.5mm splitter - one is next to the intercom's microphone recording my voice, one is near the right intercom's speaker recording its output. It's okayish and has an advantage of working with every kind of intercom but it's uncomfortable (I have 2 extra microphones and a splitter in my helmet after all) and the sound quality of the other party speaking is "meh". I'd love to know how to match all the signals and actually connect that intercom (both microphone and speaker) to the 3.5mm input of the camera. I'm pretty sure it's not (very) complicated, I just lack knowledge.
Great stuff as always. But... @4:10 holy sht.. either switch on after plugging..or use insulated terminals..or longer leads to keep your hands away from mains. Longer life means more videos for us to watch!
Would love to see a video on load cells and load cell amplifiers, I'm always recalibrating them when someone bangs one and they drift awfully must learn more.
so the noise comes from main supply goes to the switch mode when its not full filtering or missing filtering component and they will interference with another components. so in audiophile those filter is precious value component needed for clear and silent harmonic noise from other component in house or in car. 50-60 hz component create less noise or no noise at all, the noise will come to problem when using switch mode power supply which most people use it today.
Common mode filters are great for canceling unwanted stuff, even on high speed / differential transmission lines (USB, RS-485 etc.) In most cases I don't need them, but from my experience, It's a good practise to preserve some board space for these components.
You might be a bit mistaken. In the recent past I have used the head stator from a hard disk, a darlington and MOSFET based amp, and a small speaker to check for EMR in many of the devices I've built. The stator coil on the head armature of a common hard disk is sensitive enough to pick up the flux field and creates a strong enough signal to be usable through a standard microphone preamp. The only issue I've found so far is frequency. As some audio devices filter out anything above 20KHz it's sometimes difficult to accurately find and diagnose such things as back EMC. This is why I would recommend building your own amps because you can omit such filtration. This might make an interesting episode of your series "Build or Buy" because it's been a pretty useful tool for me so far since I built it.
I was going to highlight: the past tense of wind is wound (not winded), for an electromagnetic coil, (but I can't find any reference material that supports my claim.)
@@jkobain "Winded" doesn't really mean exposed to wind (at least in North America). It means when a person is running out of breath. And is pronounced differently than winding meaning wrapping a coil.
Its like you were reading my mind! I was having issues splicing in a BlueTooth adapter to an old stereo and I kept hearing high frequency noise. I was able to rid most of the issues with better shield and wiring, but it still wasn't perfect.
Thanks for great video! Now I’m making own lab bench power supply, but it has EMI. Also my cheap Chinese power supply has extremely strong EMI. It doesn’t have any EMC filter circuit . So I try to design filter for it and my lab bench power supply with help of this video :)
Nice Video, i would be interested what kind of issues one would face when dealing with Microcontrollers as the typical hobbyist will not design his own powersupply.
Hi Scott, it is a nice video. Thanks. It would be far better if you explain the principle behind x and y capacitor importance in EMC filter little elaborately. Request you to do please.
I have 48v source and I need to supply my ic with that. I wanna add a filter design to my PCB for that 48v dc input. But I am not sure how I am gonna choose the component values. In the video it seems you choose like a general values? Can you help me on that?
Usually you should try to avoid EMC problems by design like using good decoupling, controlling impedance and following design guidelines. Remember all those fancy looking star gates increase your production cost (FBC) by a lot!
You can try a Ground Loop Isolator, but it might hurt the sound quality. You can also use two different power supplies for your audio source and amplifier.
saikat sadhukha Then you should try a ground loop isolator. You can also try a low-pass filter to filter out the high frequent noises. But keep in mind that in both cases the sound quality might get degraded.
Great Video :D What about Ground loop Noise or what it`s caled tha also can come from Audio amp`s etc, so the emc is the typical high pitch sound from wall adapter`s? :D
Hi. Most modern audio gear avoids the ground loop, low pitch hum, problem by not having a connection to true earth at all or not linking that to the signal path. Modern mains adaptors are usually switch-mode, chopping at high frequency, which produces the problems presented in this video.
@@raykent3211 do you know how to fix the low pitch hum? i have a 90s stereo speaker set they uses type C kontakt so no ground in it, while pc psu uses type F in Norway that is :) and this one dont uses adaptor only bult in so :)
@@StigDesign calling Finland.... Greetings from Brittany! I've never heard heard of type C and F, but guessing from what you say that one is two wire to mains, the other three wire. You haven't got a ground loop. Almost certainly, if you're hearing a mellow hum, you've got an aged smoothing capacitor in one of the two pieces of equipment. Probably the supply to the amplifier in your speaker set. These are used to reduce ripple, they are electrolytic capacitors and at more than 20 years old it's like asking a 60 year old person to run a marathon, some can, some can't. Replace it and the set is as good as new. Have you got a soldering iron?
Oh god! I just mixed up Finland and Norway! Sorry! Me, who has told several french people not to call a Scottish person "anglais", it might cause offence.
So I've got led driving day lights on my van, now my radio fm and dab signal is is rubbish! Got some ferrite cores but where's best to fit them on leds cables or back of the radio areial cable or both ?
I made an Arduino Synth and MIDI clock signal bleeds through the audio output. Do you think I need choke inductors? where should I put the LP filter? Difficult subject :(
Hello , can you make auto cutoff timer circuit for mobile phone charger plug , working on 220 AC or 5 v 2amp dc Like - we connect in our 220v AC circuit board and set the timer according time duration
I have the issue with EMC on my project. Is the important to have the filter before the power supply on th AC side or does it also work after the power supply on the 12 DC side? Thanks!
It does work on the "B" side of the transistor before the bridge rectifier, no common mode shoke needed. Atleast that is showing a schematic of a commercial product, some 1-2.2uF capacitor in series with a 56R - 1k Ohm resistor + 2 x 100nF in series parallel to the prior resistor/cap. you can draw this in Ltspice and do a FFT analisys of the 1-2.2uF capacitor in series with a 56R - 1k Ohm. You need to use inductors to form a transformer with a "code", you gotta look for that on the web.
Can you also get this buzz with a usb interface? From there my JBL LSR305s are connector via isolated balaanced TRS. Everytime my graphics card is under demand i get a low pitch buzz from the woofer and a high pitch one from the tweater. Could this be the interfaces fault? I tested 5 PCs and all got the same problem -> NO GPU COILWHINE. I use the Behringer UMC 22
Wow, rare to see a video with such a chill sponsor. Great job Würth, thanks for your hospitality!
As a bass player I've had such a problem lately because of a cheap PSU causing an annoying electrical hiss at high volume, which is amplified when I use distortion pedals, and I almost always do. Thanks a lot for this video!
Now you know how to fix that problem ;-) Thanks for the feedback.
@@greatscottlab yes, even if I think I will definitely stick to the pre-built solution ^^
Davie504
@@akash-zg4vj yes, but actually no. But you can still slap like now, or I will call the police.
@@deadbird99 ayyyyyyyyy. *Knife pointing*
After 1 minute of the german version of this video i switched to english - even i am a german native speaker, this german voice is so unfamiliar to me :-)
Me too😂 learning electronics in english is way more fun than in german :)
same dood except I'm not native at both
Same
Ne too🤣
It's most like indian to me..lol
Thanks for a great explanation. I'm a physicist / engineer. This was always a mystery to me, especially the common mode vs differential mode. You really cleared it up.
I hope this was a joke
You definitely raised up the bar with this video. It kept me absorbed for its whole length (despite I was in the office). Thanks a lot, keep bringing more videos like this one.
Thanks for bringing up this very important topic. In most of the maker designs we see here on UA-cam and elsewhere, EMC is never mentioned. Yet it affects us all on a daily basis, from interference on audio to degraded WiFi or other equipment performance. Moreover, you can even, unknowingly, affect your neighbours. I have friends who have tracked down interference on audio to faulty/cheap/nasty SMPS several houses away!
Your English has changed so dramatically since I first watched you.
Good work, and thank you for all the videos.
Hi great Scott you’ve told me a lot about electronics thank you for everything
You're welcome :-)
When you're so early, the title changes in front of you (from German to English)
He did two videos, one in English, one in German
it's a kind of magic
@@greatscottlab *Queen song starts playing in my head*
@@itsTyrion which one! I love em!
As well as the video itself.
I've used Wurth filter components in my professional life, and they have been very good. I'd also recommend Fair-rite for ferrite devices. For this sort of interference, adding a filter will get the job done but adds cost. If this was a production situation, the first goal is always to fix the device emitting the noise. For the hobbyist getting their first exposure to EMC, this is a fine introduction.
This video gave me better knowledge about EMC topic as compared to my book on the same subject...
Loved your video and thank you for making this topic memorable for me
Thanks for the feedback :-)
This is incredibly useful for ham radio ops
You are a Legend! I owe my tinkering life to Folks like you who pour their knowledge and energy into great Production and videos that feel like hanging out with a Friend who is a Pro. Thank you
Great explanation. This is a solid reference for future research on my EMC problems. This video go straight on my electronics playlist. Thank you very much for sharing this.
You're welcome :-)
This is great information to share with amateur radio operators too. We're always chasing down RFI. Thanks Scott!
I'm not the earliest one but i always watch your video's no matter what!
And as always very good and informative video!!
Thanks for watching :-)
Awesome! Würth did a great job advertising here
@@jkobain if you need any support from AVX, do let me know.
Great intermediate video into the world of EMC!. A good thing to remember is that signal/power integrity/quality are inversely releated to EMC problems, if you have a well routed signal (tight ground return, matched impedances, length matching on differential pairs, etc), then your signal integrity will be solid plus that particular signal will likely be EMC compliant and immune to external interference. Win-win situations like that are certainly possible and desireable. If you can catch them early in the design phase (schematic & layout) then you'll be saving yourself alot of frustration down the road.
Recommendation to definitely do a video on ESD / EFT in the future as that's another common EMC problem that EEs must face when designing products.
suprisingly educational for a video i thought was mostly gonna be about the sponsored content. good work
Thanks but that is what I always try to do. Content comes first, then everything else.
Coincidentally, what you just demonstrated is my new job. I spent 20 years doing production testing and troubleshooting of avionics, and now I'm doing EMI testing for new designs. 2 months ago, I had never even heard of such things as LISNs.
This was excellent! I had a very similar problem making powered speakers and buying a cheap PSU brick on eBay. A genuine Toshiba one was much quieter.
Big advantage to live in the same country as Würth, you can visit the facilities, wonderful kit!!!! very beatiful, I really like this type of advanced content
I love this video; it's so informative. Please keep it up!
I think the word you're looking for is "suppress" rather than "oppress".
@GreatScott You know, after I watched this, I went to Würth Elektronik, and got the sample(s), and I didnt expect it to be so robust, and everything, I did mention you, and how what you were doing here, is what I wanted to do, and I still didnt think they would send anything at all, from 10th today the 15th of Nov(as there was no delivery date or where it was really coming from nor a tracking number) , holy shnitzel pretzel! HOnestly I thought the package or box anything would have been smaller like literally half the size, they looked so small on the screen, both on here and the website. Enough for 10 of these boards, and 3 are gonna be used to see if I can fix my problem, and maybe even my work problem that will require 3 there as well, 6 already gone... And they are DAMN GOOD quality too! Not the cheap knock offs that one would get with samples, heardy and robust, and damn good case too! Thank you so much GS! I will damn well be ordering other things from them in the future... I hope you get something outa the referrals or something even more! Even after i buy more!
You deserve your nickname: you are a GREAT person and engineer! Excellent explained and reproduced. Was a GREAT pleasure from my side #askLorandt
You are the only engineer I know capable of oppressing noises, you are the savior please help us mitigate the EMI and build a better world my lord. 7:26
At beginning (1:00) there is noise when LED strip is put at 50%. In your final tests, the LED strip doesn't seem to be at 50%. If true, it is not a fair comparison as 50% would generate more noise. Never the less, it is still a great video on how to remove EMC.
It created no noise no matter the brightness of the LEDs.
@@greatscottlab I was saying that since I have issues myselft when my LED strip is not at 100%. My problem are completely gone when at 100%.
Above and beyond what was necessary for emc problems caused by your LED’s. Lol Love this video. Thank you for all your hard work
@2:17 this was extremely helpful! I've been trying to figure out how to set up an AC to DC power supply and understood the rectifier half, but not the transformer part. Need more vids like this
This was very insightful! Thanks for the time and effort you put into making this video. Keep up the good work!
This escalated so quickly. The last time i was here you were blinking LEDs with an Arduino.
Great vid. Question: The shield at 10:30, is it connected to earth through the mains cord?
I finally know what those bulges on my cables are. Ferrite rings!
Correct :-)
*notices ferrite core* owo
Or maybe it's just happy to see you
@C W That's what she said. :-0
Thank you for the great introduction video Scott. It was very enlightening.
Stay creative and I will see you next time! So inspirational and helpful, thank you so much!
I needed this video for so long now
Your videos are so enjoyable.
It's so scary...i literally encountered that problem two days ago and coom, GreatScott uploads a video to solve the problem ^^
Me too
Me too
Me too
Me too
Me too
Wow talk about good timing. I recently got an HDMI audio splitter from Amazon and it seems ever since I plugged it in my speakers have been making similar noises. Not sure I can manage building a filter (even with a kit 😅) but I was considering trying out some snap ferrites. Thanks for the interesting and informative video!
Your English is better than my Deutsch ever was, but it was wonderful seeing the other version for a moment. Could you please include a link to your "other" versions of the episodes in your descriptions? I'd love to hear both, frankly as my fluency is gone and I'd like to try a little. Since I grok the content, I expect it'll be more approachable. (Kinda like setting an alternate language on my phone or FB.) Thank you for your wonderful series of very interesting and educational content. tschüß
On the subject of audio. Did you happen to try to connect helmet intercom to action camera? I've seen you trying an intercom before (BTW that video motivated me to get one, thank you, best riding related decision ever). I have this funky setup where I connect two microphones to the camera via 3.5mm splitter - one is next to the intercom's microphone recording my voice, one is near the right intercom's speaker recording its output. It's okayish and has an advantage of working with every kind of intercom but it's uncomfortable (I have 2 extra microphones and a splitter in my helmet after all) and the sound quality of the other party speaking is "meh". I'd love to know how to match all the signals and actually connect that intercom (both microphone and speaker) to the 3.5mm input of the camera. I'm pretty sure it's not (very) complicated, I just lack knowledge.
Thanks! I've been looking for it for my soldering station. Because it dims the whole room's lighting when I turn it on of off.
Great stuff as always.
But... @4:10 holy sht.. either switch on after plugging..or use insulated terminals..or longer leads to keep your hands away from mains.
Longer life means more videos for us to watch!
Would love to see a video on load cells and load cell amplifiers, I'm always recalibrating them when someone bangs one and they drift awfully must learn more.
Hi Great Scott, please make a video on Logic Gates, it would be a great help for me.
so the noise comes from main supply goes to the switch mode when its not full filtering or missing filtering component and they will interference with another components. so in audiophile those filter is precious value component needed for clear and silent harmonic noise from other component in house or in car. 50-60 hz component create less noise or no noise at all, the noise will come to problem when using switch mode power supply which most people use it today.
Did I understand it all?
Nope!
But
Thank you for the insight.
Ive never been so early to a video! Love you Great Scott!
Thanks for watching :-)
Common mode filters are great for canceling unwanted stuff, even on high speed / differential transmission lines (USB, RS-485 etc.)
In most cases I don't need them, but from my experience, It's a good practise to preserve some board space for these components.
5:45 give me that adjustable power resistor 😍😍😍😍😍😍
www.contrex.si/en/product-category/variable-resistors/
Can you please make a dc current booster circuit , which boost 2amp of current to 10amp DC .
This was a bit long infomercial... and quite educative btw!
Thanks!
You might be a bit mistaken. In the recent past I have used the head stator from a hard disk, a darlington and MOSFET based amp, and a small speaker to check for EMR in many of the devices I've built. The stator coil on the head armature of a common hard disk is sensitive enough to pick up the flux field and creates a strong enough signal to be usable through a standard microphone preamp. The only issue I've found so far is frequency. As some audio devices filter out anything above 20KHz it's sometimes difficult to accurately find and diagnose such things as back EMC. This is why I would recommend building your own amps because you can omit such filtration. This might make an interesting episode of your series "Build or Buy" because it's been a pretty useful tool for me so far since I built it.
Excellent video, great introduction to the topic.
Those EMC kits look really nice, I'm guessing they would be expensive.
Google would reveal that Mouser sells them for €140 a pop. So yeah, a bit expensive for the average electronics enthusiast...
Cheaper way is maybe to gut apart dead branded PSU (usually HP, Dell, famous pre built brands use good PSU which has EMI filter)
Wie praktisch, das Video kommt passend zur Projektarbeit über EMV in der Berufsschule. :D
Glück muss man haben ;-)
Very helpful video 👍
You pronounce "series" like "serious", was a bit confusing haha. Great project, I loved it.
@@jkobain I'll put a smile on your face.
I was going to highlight: the past tense of wind is wound (not winded), for an electromagnetic coil, (but I can't find any reference material that supports my claim.)
@@jkobain "Winded" doesn't really mean exposed to wind (at least in North America). It means when a person is running out of breath. And is pronounced differently than winding meaning wrapping a coil.
@@jkobain No I was talking about winded not wound! Two completely different words.
Thumbs up for having an electromagnetic test chamber as part of your analysis
Great Scott, did it help that cheap PSU when you inserted missing capacitors?
Fantastic work, dude! Thanks for all the tips! 😃
Its like you were reading my mind! I was having issues splicing in a BlueTooth adapter to an old stereo and I kept hearing high frequency noise. I was able to rid most of the issues with better shield and wiring, but it still wasn't perfect.
Thanks for great video!
Now I’m making own lab bench power supply, but it has EMI.
Also my cheap Chinese power supply has extremely strong EMI. It doesn’t have any EMC filter circuit .
So I try to design filter for it and my lab bench power supply with help of this video :)
I know you are selling me a kit...
But I LOVED IT
I hurried here...!!but could not comment first after seeing the notification....!!!
First thing to do in the morning! Watch greatscott videos!!
This video is great as always and helped me well!
As an engineer, I’m impressed, thx
What a great guy
Can you tell me where do you learn these concepts and things
I didn't know this company made a filter design kit. I need to buy a bunch of these.
Dies ist eine gute Information. Danke Scott
In your power supply, you showed us that there was "missing" capacitors, but can we just solder new ones to get rid of the interferences?
I think the other side of the caps were not connected to earth. So it would not have fixed the problem.
@@greatscottlab How ok, so even the pcb wasn't really complete
Another interesting and informative video, thank you!
thanks for the information. Well presented for this old engineer.
Nice Video, i would be interested what kind of issues one would face when dealing with Microcontrollers as the typical hobbyist will not design his own powersupply.
question the circuitry for conditioning between the preamp and adc are din module ?do i need sample and hold and mutiplexer in audio system ?
Hi Scott, it is a nice video. Thanks. It would be far better if you explain the principle behind x and y capacitor importance in EMC filter little elaborately. Request you to do please.
I was halfway thru german one when i noticed the link
yep, i just come from the german version, now the german version is gone
Seraph ?
@@clee2423 is it? I still can open it
Uploaded 21 seconds ago
*I am speed*
Your comment is 2h old while there are others 3h olds
I have 48v source and I need to supply my ic with that. I wanna add a filter design to my PCB for that 48v dc input. But I am not sure how I am gonna choose the component values. In the video it seems you choose like a general values? Can you help me on that?
the "i will see you next time" in this episode was unusually energetic. whats the catch? @GreatScott
@@roidroid sure thing.
Usually you should try to avoid EMC problems by design like using good decoupling, controlling impedance and following design guidelines. Remember all those fancy looking star gates increase your production cost (FBC) by a lot!
So much information...going to have to watch that one again.
Do a video on ground loop problem
Are emi filter or inductor can reduce noise on audio signal?
Your old video description telling you could get the filter design board free of charge was misleading.
Can you tell how to remove ground loop from audio systems?
You can try a Ground Loop Isolator, but it might hurt the sound quality. You can also use two different power supplies for your audio source and amplifier.
use vias between top layer and bottom layer of pcb. it's need a lot of experiac of layout and placement of components
@@petermuller5031 it is actually for my car it is not possible to get two different power supplies.
saikat sadhukha Then you should try a ground loop isolator. You can also try a low-pass filter to filter out the high frequent noises. But keep in mind that in both cases the sound quality might get degraded.
You might consider using toslink / optical to eliminate those darn loops
I've used those rgb controllers with a small rgb laser setups.. So many uses..
Tnx for this video! Now I know how to build the filters for SMPS and I can use it in my own design
Great scotti is back love you 😍
Fantastic video man!
Great Video :D What about Ground loop Noise or what it`s caled tha also can come from Audio amp`s etc,
so the emc is the typical high pitch sound from wall adapter`s? :D
Hi. Most modern audio gear avoids the ground loop, low pitch hum, problem by not having a connection to true earth at all or not linking that to the signal path. Modern mains adaptors are usually switch-mode, chopping at high frequency, which produces the problems presented in this video.
@@raykent3211 oh i see thank you :)
@@raykent3211 do you know how to fix the low pitch hum? i have a 90s stereo speaker set they uses type C kontakt so no ground in it, while pc psu uses type F in Norway that is :) and this one dont uses adaptor only bult in so :)
@@StigDesign calling Finland.... Greetings from Brittany! I've never heard heard of type C and F, but guessing from what you say that one is two wire to mains, the other three wire. You haven't got a ground loop. Almost certainly, if you're hearing a mellow hum, you've got an aged smoothing capacitor in one of the two pieces of equipment. Probably the supply to the amplifier in your speaker set. These are used to reduce ripple, they are electrolytic capacitors and at more than 20 years old it's like asking a 60 year old person to run a marathon, some can, some can't. Replace it and the set is as good as new. Have you got a soldering iron?
Oh god! I just mixed up Finland and Norway! Sorry! Me, who has told several french people not to call a Scottish person "anglais", it might cause offence.
So I've got led driving day lights on my van, now my radio fm and dab signal is is rubbish!
Got some ferrite cores but where's best to fit them on leds cables or back of the radio areial cable or both ?
I made an Arduino Synth and MIDI clock signal bleeds through the audio output. Do you think I need choke inductors? where should I put the LP filter? Difficult subject :(
Hello , can you make auto cutoff timer circuit for mobile phone charger plug , working on 220 AC or 5 v 2amp dc
Like - we connect in our 220v AC circuit board and set the timer according time duration
What can I do whrn I have the psu integrated into the speaker and it makes a 50 to 60hz buzz when idle and even when its the only device in the socket
I have the issue with EMC on my project. Is the important to have the filter before the power supply on th AC side or does it also work after the power supply on the 12 DC side? Thanks!
It does work on the "B" side of the transistor before the bridge rectifier, no common mode shoke needed.
Atleast that is showing a schematic of a commercial product, some 1-2.2uF capacitor in series with a 56R - 1k Ohm resistor + 2 x 100nF in series parallel to the prior resistor/cap. you can draw this in Ltspice and do a FFT analisys of the 1-2.2uF capacitor in series with a 56R - 1k Ohm.
You need to use inductors to form a transformer with a "code", you gotta look for that on the web.
how do i check for the Modern EMC design guidelines ?
Those kits are amazing
So what should be used,emc filter or shield...?
Can you also get this buzz with a usb interface? From there my JBL LSR305s are connector via isolated balaanced TRS. Everytime my graphics card is under demand i get a low pitch buzz from the woofer and a high pitch one from the tweater. Could this be the interfaces fault? I tested 5 PCs and all got the same problem -> NO GPU COILWHINE. I use the Behringer UMC 22