Pedal circuit copy question

G

gkgkgkrj

New member
Hello

I'm working on a circuit diagram of the nos pedal that I have.

It's my first time reversing the circuit, so I'm not sure if it's made right

Is there something weird that see??

I think I did a good job on the gain side, but I'm asking because the input buffer looks weird!

It's still before ordering parts, so I'd appreciate it if you could let me know if there's anything you seem to have made a rudimentary mistake

jfet is using n-channel transistor! 스크린샷 2025-01-03 오후 5.40.06.png
 
This part seems redundant.
1000006005.png
Dual LPF?

May benefit from an output stage after these, even just a jfet buffer to keep output impedance stable. Also, after clipping and filtering, the output level could be quite low.

Also. Not sure about the VCC link to U2.1 through R6. Wouldn't R6 decrease VCC and through the AC signal below VCC? Maybe this is fine. I just woke up so...

Where's the power input/voltage divider?
 
It looks OK to me, it's just drawn a little different.

It might look more familiar drawn like this:

1735911172628.png

I don't see anything that immediately stands out as a problem. Normally you'd have an input coupling capacitor between the input and the gate of U1, but not always, considering it's a JFET input stage. Like @jwin615 pointed out, you're missing the VREF voltage divider but I'm assuming you just haven't gotten there yet.

jwin615 said:
Not sure about the VCC link to U2.1 through R6.
Click to expand...

R6 is a VREF pull-up resistor. It crosses over +9V but isn't actually connected.



What pedal is this?
 
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