Thanks, interesting project became i have had that need recently and was wondering about building something. My 2 thoughts on the glitch. 1 those caps you refer to as local, aren't very local. 2 digikey wants $36 for those parts and you got them for way less. Probably don't need tant caps. Decent electrolytic caps and ceramic bypass is probably good enough these days
The LM3886T may be an even better choice, as it supports a wider set of voltage rails (+/- 28V) and has a maximum peak power dissipation of 125 watts. Also, its minimum unit gain bandwidth product is 2 MHz (8 typical), which is pretty phenomenal. These are currently on back-order at Mouser, but they can be found on eBay. Please avoid international sellers, however, as many parts from international sources are counterfeit. I have made several buffer amps with this part and it's a tremendous addition to any standard signal level signal generator. Also, this part is similarly protected from thermal overload (via Self CC = Peak Instantaneous Temperature (°Ke) (SPiKe) ±35V protection circuitry,) and short circuiting. You just can't go wrong with this part.
I've recently got an HP 6827A and I love it! Mainly use it with my pulse generator to do some niche things. What is the "modern equivalent" your friend mentioned? I ask because I recently got some Kepco units. I got a Kepco BOP 36-12 and a BOP 20-10. They only have a frequency response of ~15kKHz but are rated 10 amps! I like the kepco models because you can amplify voltage OR current, allows for some unusual setups I have yet to play with.
Have you seen the function generator amplifiers offered by the feeltech/feelelect brand? Not too pricey, and they have various models capable of between 20 to 100watts, and up to 10mhz. There are a dozen different models but a few of them are FPA301 series FPA1000 SERIES
When measuring temperature with an "IR gun" be sure to consider its detection area, which is a cone starting from the lens. The red lasers I think are just "for fun".I know you know, but my OCDdness made me write the comment :D Silly question, have you worked at HP in the golden days?
@@IMSAIGuy Thermal cameras are fun, but waste lots of time. Just hold your "Laser" sensor right on top of the DUT , press and release the button = perfect reading of a thimble sized volume of heat in 2 seconds - with _zero_ possible background FOV noise! It's a 30+ degree FOV cone temp sensor and you were off-camera (1+ft) away from the DUT!
Very interesting. My wanderer thoughts in the past for a poorer man’s solution, using those TDA2020 or 2030 as you chose, but didn’t proceed at that time. Your research hints to be promising, obviously for lower voltages and currents, as to drive 12V rated DC motors (~servo like). Have you worked some more about it, or found other people with results - good, so so, or really bad? Thanks for sharing.
So after watching this video I got curious and found this company. Can you or anyone who reads this take a look and tell me their thoughts of the power supplies offered here. Zeal Manufacturing & Calibration Services Pvt. Ltd
@@IMSAIGuy Yes, I am aware of these parts. Unfortunately they are discontinued! I have yet to find any suitable replacement that is still being made! Very frustrating!
Great tutorial, looking forward for the second part.
What a good idea, I never thought of that. Cool.
Thanks, interesting project became i have had that need recently and was wondering about building something. My 2 thoughts on the glitch. 1 those caps you refer to as local, aren't very local. 2 digikey wants $36 for those parts and you got them for way less.
Probably don't need tant caps. Decent electrolytic caps and ceramic bypass is probably good enough these days
The LM3886T may be an even better choice, as it supports a wider set of voltage rails (+/- 28V) and has a maximum peak power dissipation of 125 watts. Also, its minimum unit gain bandwidth product is 2 MHz (8 typical), which is pretty phenomenal. These are currently on back-order at Mouser, but they can be found on eBay. Please avoid international sellers, however, as many parts from international sources are counterfeit. I have made several buffer amps with this part and it's a tremendous addition to any standard signal level signal generator. Also, this part is similarly protected from thermal overload (via Self CC = Peak Instantaneous Temperature (°Ke) (SPiKe) ±35V protection circuitry,) and short circuiting. You just can't go wrong with this part.
I looked at some audio amp chips. They did not have internal short circuit protection.
Looks like a good and useable project. Thanks for the look.
Thanks for the lesson IMSAI Guy. Fred
I've recently got an HP 6827A and I love it! Mainly use it with my pulse generator to do some niche things. What is the "modern equivalent" your friend mentioned? I ask because I recently got some Kepco units. I got a Kepco BOP 36-12 and a BOP 20-10. They only have a frequency response of ~15kKHz but are rated 10 amps! I like the kepco models because you can amplify voltage OR current, allows for some unusual setups I have yet to play with.
the ones he mentioned are made by Picotest. They have signal injectors for high current pulses.
I had forgotten about those Kepco units. very nice.
You need tantalum caps right at the IC. You have long leads.
I tried that and it did not help ☹
Fun. Good video. Thank you. It is much appreciated and I look forward to part two. :-)
Have you seen the function generator amplifiers offered by the feeltech/feelelect brand? Not too pricey, and they have various models capable of between 20 to 100watts, and up to 10mhz. There are a dozen different models but a few of them are
FPA301 series
FPA1000 SERIES
haven't seen that, had anyone done a teardown?
@@IMSAIGuy not that I can find. But myself and several others would be interested in seeing that
When measuring temperature with an "IR gun" be sure to consider its detection area, which is a cone starting from the lens. The red lasers I think are just "for fun".I know you know, but my OCDdness made me write the comment :D
Silly question, have you worked at HP in the golden days?
yes, I need to upgrade to a thermal camera
@@IMSAIGuy Thermal cameras are fun, but waste lots of time. Just hold your "Laser" sensor right on top of the DUT , press and release the button = perfect reading of a thimble sized volume of heat in 2 seconds - with _zero_ possible background FOV noise! It's a 30+ degree FOV cone temp sensor and you were off-camera (1+ft) away from the DUT!
Very cool
Cool! I am just seeing this.
Without peeking at the next video yet, I wonder if the glitch was from your wire-wound resistor being an inductive load.
now you have to watch part 2
watch #802 also, there are some measurements at the end
Very interesting. My wanderer thoughts in the past for a poorer man’s solution, using those TDA2020 or 2030 as you chose, but didn’t proceed at that time.
Your research hints to be promising, obviously for lower voltages and currents, as to drive 12V rated DC motors (~servo like).
Have you worked some more about it, or found other people with results - good, so so, or really bad?
Thanks for sharing.
Why aren’t you using your adjustable 25ohm resistor? :-)
stay tuned
An audio amp good to 1MHz?
Damn..... I was in the field artillery, my ears aren't THAT good ;)
A welding amplifier
So after watching this video I got curious and found this company. Can you or anyone who reads this take a look and tell me their thoughts of the power supplies offered here. Zeal Manufacturing & Calibration Services Pvt. Ltd
How about an amp that can deliver +/- 10 volts into 50 Ohms up to 30 MHz? That's only 200 mA but much faster. I would like to find such a thing.
ua-cam.com/video/LREJazLcELs/v-deo.html
@@IMSAIGuy Yes, I am aware of these parts. Unfortunately they are discontinued! I have yet to find any suitable replacement that is still being made! Very frustrating!
@@herbertsusmann986 OPA633
is close
OPA692
@@IMSAIGuy Yep, both of those parts fall short (OPA692 and OPA633). Seems no one makes a 50 ohm driver anymore than can drive to +/- 10 volts fast.