Recent content by temol

@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/

I often add a transistor model using a spice directive directly in the asc file. I google the model, copy to clipboard, hit .op button, paste model, click ok. Then I change the name of the transistor to the same as in the model. For example - this is complete model of the 2N5088 .MODEL 2N5088...

Here's double tracker project with modulation feature.

There's still something wrong around diode. Routing should look like this It looks like you don't need to use the Vcc+ flag at all. Because pins 1 and 8 of the charge pump are not connected anywhere (except diode). You only use -9V. So the 9V flag is only on the anode side of the diode. On...

You have taken on a rather difficult task for a beginner - the layout should be nice. I would rather try to follow the schematic, of course trying to maintain "elegance". Now you have a lot of long traces, which can be easily avoided by moving some elements.