Audio Probe? Show me one..... Where can i get one?

[Garrett]

I here tale of an audio probe.  What is it and Where can i get?


                      I owe you one, Garrett 

[cd]

You MAKE one:

http://geofex.com/FX_images/audioprb.gif

If you're new to DIY FX, go to www.geofex.com and read the entire site.

[Peter Snowberg]

Welcome to the forum.



An audio probe is simply a tool for connecting your amp to various points in the circuit other than the output jack. The one special addition is a DC blocking cap. You can use any cap that's large enough to let signals through, but a value of 0.1uF works VERY well. Just be sure the volatage rating of the cap is higher than the voltages used in the device you're debugging. For effects, a 35V or 50V cap is plenty, but for tube work a 600V cap is more like it.

[petemoore]

  I use the 'bakassward' technique, starting from output, connecting my thumb in ever increasingly 'toward input' points, listening for the familiar buzz your thumb makes as a signal source [like a tone generator but sounds like 'thumb']...the 'Thumbuzz' technique is quite useful and easier for me to find [any little screwdriver to that can touch in circuit point [only where you want to test] and connected to my thumb...
  DO NOT use this debugging technique on other than low voltage circuits !!!

[phaeton]

Dewd....

Is your thumb singlecoil, doublecoil, active or passive?  How well can you play it?*


(the only reason I'm bugging you is because I do the same thing.  I'm all too familiar with buzz that is 'thummy')

[aron]

http://www.diystompboxes.com/pedals/debug.html

[MetalGod]

other than debugging to see where the signal stops (if you're getting no sound) the audio probe is cool for tapping off various parts of the circuit - it's interesting to see how a pedal sounds at different parts of the circuit (to me anyway)

[Garrett]

Thanks wizards,

    i will indulge ,


                          awesome, Garrett

[D Wagner]

Garrett,

This is a little more complicated to build, but it is an awesome tool.  The PCB artwork and construction information is about 2/3 of the way down the page.

http://www.talkingelectronics.com/Projects/MiniBenchAmp/MiniBenchAmp.html

Derek