Recent content by temol

Modestly, in black.

How about this?

The first iteration on the breadboard turned out to be unstable - oscillations appeared with gain past noon. I grabbed another breadboard and the whistles disappeared. 90dB of gain is not that little, so the layout is quite important. Small sample here. Guitar -> breadboard -> audio interface...

Can you post frequency resposne of this circuit? Thx :)

@Robert - can we expect other pedals than 800 from the M family?

You won't hear the difference with 3k6, 3k7, 3k74 or even 3k9. Take into account that we don't know Vp of the transistor. A different Vp value means a different drain resistor value (trimmer), which also somehow affects the frequency response of this stage. Below - frequency response of the...

20k may not be enough to bring J201 drain voltage down to 9V. Use 50k or even 100k for the trimmers. I doubt that first stage of the 2000s clips the signal. With the j201 and C2 250u I would not expect clean signal after Q1.

If you scale down tone stack resistors/potentiometers 10x than you have to scale up capacitor values the same amount. So - R7 not 56k but 5k6. C9 not 22n but 220n. And so on. But I wouldn't do it blindly - I would start with a simulation in ltspice. I would draw a tube and JFET preamp nnd...

Check BD436 or BD438

Finally

Pedal from the Barbie doll set :)

I cant't force you to follow our suggestions. Think about one thing - why designers of effects that emulate tube amplifiers don't copy tube schematics 1:1. I mean commercial pedals. Why do they simplify certain issues, or use equivalent circuits that do not resemble the original at all from the...

I agree. Or M800 Or Brownout OD Also a good read https://runoffgroove.com/thunderbird.html Don't try to blindly convert tube schematic to jfets.

Hm... I strongly suggest breadbording the circuit before ordering/making a PCB. Up to C100 it seems to be OK. Well, except for the aforementioned TR102. But the next part... let's assume that you set the bias for Q5 and Q6 using TR100 and TR101. Let it be 5V. As soon as you use the Presence...

Here's an example - check the schematic https://www.electrosmash.com/1wamp To make it stereo - just split the 22k resistors, add another 100n cap. Post #12 https://forum.pedalpcb.com/threads/balanced-effect-line-level-and-spread.22986/