Author Topic: What circuit is this?  (Read 591 times)

mikepurcell

What circuit is this?
« on: May 25, 2021, 03:09:45 PM »
Anyone know what circuit this is? I got it on a haul of parts from a guy that was getting out of making pedals.

Transistors are:
2N2222
2N3904
2N5088
2x green LEDís

2x spst
3x pots - havenít pulled them to check values yet.

Some kind of distortion or fuzz circuit, it sounds cool but itís got some problems. Plus Iíd rather build my own.


Kevin Mitchell

Re: What circuit is this?
« Reply #1 on: May 25, 2021, 03:30:17 PM »
Just throwing darts here, may be a NPN Tone Machine with whatever parts the dude had laying around.

Send a photo of the backside and we'll reverse engineer it.
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mikepurcell

Re: What circuit is this?
« Reply #2 on: May 25, 2021, 07:17:08 PM »
As requested.



Additional info:
B5k - voltage sag pot
B25k - Iím guessing fuzz/distortion
A100k - Output pot

Looks like the switches are on each diode to take them in/out of the circuit. Diode 1 is connected to base of Q2, Diode 2 to base of Q3. Numbering them top to bottom from the top photo.


mikepurcell

Re: What circuit is this?
« Reply #3 on: May 26, 2021, 01:45:37 PM »
Figured it out, itís a Dwarfcraft Shiva.

Fancy Lime

Re: What circuit is this?
« Reply #4 on: May 26, 2021, 05:30:15 PM »
"... getting out of making pedals"? What is that? Never heard of it. Sounds serious. Please don't tell me it's contagious!
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