zonk against the machine

[karsten_h]

... anyone ever checked this circuit? experience? suggestions? opinions?



https://www.thetonegod.com/diy/zatm

[JustinFun]

No, but I'm going to now!

Haven't seen this and have been fiddling around on a silicon mki tonebender for a while now with no success, so this. looks like an excellent starting point

[antonis]

As far as Q3 is Si BJT, it can't work without DC bias..
(Ge might rely on leakage current, althougt unpredictable..)

Also, R7 better be connected on Q2 Collector (feedback bias) 'cause, as it is, Q2 out is strongly depended on partiqular device h_FE..

[antonis]

A more BJT junkbox friendly circuit..



edit: TONE pot, C3 & R7 values set for more convenient adjustments..

[PRR]

Q3 is Si BJT, it can't work without DC bias..

It will, while the signal into Q3 is large enough (half-volt or more).

I assumed that was the job of Q1 Q2.

And that the "gate" on decay was part of "the sound". Self-muting after 3-transistor distortion may be a relief.

[antonis]

It will, while the signal into Q3 is large enough (half-volt or more).

It works only for a couple of seconds..
(while capacitors are discharged..)

After that:


150mV input, LEVEL at max..

[JustinFun]

Yeah, it doesn't work at all as drawn (the original schem, haven't tried atonis' version yet).

Surprised to read on the blog post "I found the response of the Si circuit quite similar to the Ge version so I think I succeed in keeping the spirit of the circuit intact."

[antonis]

haven't tried atonis' version yet...

You'll get something like this:

[karsten_h]

haven't tried atonis' version yet...

You'll get something like this:

amazing! how did you simulate these graphs?

[antonis]

https://www.ti.com/tool/TINA-TI

https://tina-ti.informer.com/9.2/

https://www.tina.com/tina-student-version/

[karsten_h]

thx for investing your time here will give it a try pretty soon...