Very simple and way cool. I suppose you could add a vol pot in line to prevent overloading the input of the bench amp. Probably not needed but it's another gizmo and who doesn't like more gizmos?
Excellent idea!:-)I’m using it to repair a Vox Ac15. Advice: Best to use tube amps!!!! Initially I‘ve tested it with an cheap transistor amp and ruined the input section/ the first transistor . (Next time would either decrease the caps value by testing to lowest usefull value, to decrease the tiny voltage spikes which pass the cap before loaded…or use a transformer input for transistor amps.)
I haven't seen any videos on using one of these (signal tracer) on an audio receiver. I have one stuck in protect mode and was wondering if something like this would work to trying and find out if there is an open component somewhere? I just don't want to risk blowing something up if it's not a practical option to voltage testing.
Unfortunately, that sounds like a power amp output stage or power supply fault. DMM is your main diagnostic tool for that kind of problem, plus understanding what conditions cause it to go into protection. That would be described in the manufacturer's service manual but generally some supply voltage is not reaching the normal level, there's DC on the speaker output, and/or too much current is being drawn from the power supply. Audio signal tracing is for gear that at least powers on and kinda works, as demonstrated.
With audio signal tracers getting hard to come by these days, this is pretty cool. I wonder how much the value of the capacitor matters. You could also feed the signal into an oscilloscope as well. One thing I would probably do differently is put heatshrink tubing over the capacitor. It may actually fit inside the probe tip.
I wouldn't go any snaller than .022 if or you may get bass roll off. 630v also means you can poke pretty much anywhere in a tube amp. Thanks for the input.
@@KleyDeJong Interesting! I have an 18 watt Marshall build that's giving me issues with a very odd squeal. I bought a scope but don't really know how to use it properly for diagnosing, this Audio Probe sounds much more at my level! Lol
@@dyamariv3628 As mentioned earlier, use this probe as input to your oscilloscope. Instead of (or in addition to) hearing the result through the practice amp, you'd SEE the resulting frequencies. I found this to be a must when I was testing and tuning a harmonic tremolo build.
Would it be okay to run 2 smaller capacitors in series as long as they added up and rated 630V? Just wondering as I would like it all to fit inside the probe.
That was exactly what i searched for...sweet and to the point!
I’ve been meaning to make one of these. Always slips my mind. Guess it’ll take actually needing one some time to remind me!
Good vid! Simple concept but powerful troubleshooting kung-fu
Thank you. Just what I needed.
You're welcome!
Very simple and way cool. I suppose you could add a vol pot in line to prevent overloading the input of the bench amp. Probably not needed but it's another gizmo and who doesn't like more gizmos?
Great video tutorial - thank you!
Excellent idea!:-)I’m using it to repair a Vox Ac15.
Advice: Best to use tube amps!!!! Initially I‘ve tested it with an cheap transistor amp and ruined the input section/ the first transistor .
(Next time would either decrease the caps value by testing to lowest usefull value, to decrease the tiny voltage spikes which pass the cap before loaded…or use a transformer input for transistor amps.)
What capacitance value for transistor amps should be for more safety.
I haven't seen any videos on using one of these (signal tracer) on an audio receiver. I have one stuck in protect mode and was wondering if something like this would work to trying and find out if there is an open component somewhere? I just don't want to risk blowing something up if it's not a practical option to voltage testing.
Unfortunately, that sounds like a power amp output stage or power supply fault. DMM is your main diagnostic tool for that kind of problem, plus understanding what conditions cause it to go into protection. That would be described in the manufacturer's service manual but generally some supply voltage is not reaching the normal level, there's DC on the speaker output, and/or too much current is being drawn from the power supply.
Audio signal tracing is for gear that at least powers on and kinda works, as demonstrated.
the cap has a polarity?? +ve towards the plug side/or amp??
Capacitor in series??
how would i attenuate for amplified signals? genius to use a guitar amp, btw
With audio signal tracers getting hard to come by these days, this is pretty cool. I wonder how much the value of the capacitor matters. You could also feed the signal into an oscilloscope as well. One thing I would probably do differently is put heatshrink tubing over the capacitor. It may actually fit inside the probe tip.
I wouldn't go any snaller than .022 if or you may get bass roll off. 630v also means you can poke pretty much anywhere in a tube amp. Thanks for the input.
The capacitance doesn't matter as much as the voltage. I would say a 500v minimum for guitar amps.
Awesome 👌 Thanks
Awesome video Kley, I always wondered how those probes were made and how they worked. So what was the issue with the amp?
I had some errors just prior to the phase inverter where I was mixing two preamp paths.
@@KleyDeJong Interesting! I have an 18 watt Marshall build that's giving me issues with a very odd squeal. I bought a scope but don't really know how to use it properly for diagnosing, this Audio Probe sounds much more at my level! Lol
@@dyamariv3628 As mentioned earlier, use this probe as input to your oscilloscope. Instead of (or in addition to) hearing the result through the practice amp, you'd SEE the resulting frequencies.
I found this to be a must when I was testing and tuning a harmonic tremolo build.
Hi,
Please draw a probe schematic and wire connection in the demonstration. Thank you
Would it be okay to run 2 smaller capacitors in series as long as they added up and rated 630V? Just wondering as I would like it all to fit inside the probe.
Two big ones in parallel will have the capacitance but increase voltage capacity.
@@KleyDeJongvoltage capacity doubles when in series not in parallel, but halves the capacitance.
Im gonna build one
Alternatively, you could buy a ZEEWEII DSO154Pro oscilloscope with built in function generator for £40 (inc. test probe or less sans probe)...
Your capacitor link is not what you are using