Mad Professor - Simble [traced]

[Lithium_Grim]

What's the purpose of those parallel caps? C12 & c13? I'm asking because if you connect c12 to accent 1 and leave c13 as is...it works as a high presence filter. Did someone try this?

Mostly you put 2 caps in parallel to get a value which is not (at all) available or very expensive to buy. In this case they form a replacement cap of 267nF which is a close one to the not that standard in (e27) 270n caps. Sometimes it is cheaper for manufacturing to use e12 values when outsourcing to... china

But if you want to safe space... use a 270n

[matt239]

So, what do the tone controls do?
It sounds different than zendrive to me. It has a few extra parts, yes?

[rtcustom]

So, what do the tone controls do?

If you had just tried, you would have realized that ACCENT works like a PRESENCE knob, and CONTOUR works like a BRIGHTNESS or classic "tone" control!

It sounds different than zendrive to me. It has a few extra parts, yes?

Sounds very similar, and yes, It has a few extra parts more than Zendrive!

[VitaliiBobrov]

I've created a repo with KiCad source files: schematic and PCB
https://github.com/vitaliy-bobrov/simble-overdrive

Interactive BOM https://vitaliy-bobrov.github.io/simble-overdrive/

The PCB is verified (v1.0), repo contains a slightly updated one (v1.1).

Shots of my build
https://photos.app.goo.gl/1UWHBhjtgndBmv3w5

[cbriere]

check this:
https://www.pedalpcb.com/product/symbolicod/

[VitaliiBobrov]

check this:
https://www.pedalpcb.com/product/symbolicod/

I've seen this before, but right now it takes ages to get orders from the US to EU, that's why I've created own PCB layout and ordered it. Another thing, I've placed all controls the same way as it was on Mad Professor version of the pedal.

[cbriere]

I've seen this before, but right now it takes ages to get orders from the US to EU, that's why I've created own PCB layout and ordered it. Another thing, I've placed all controls the same way as it was on Mad Professor version of the pedal.
[/quote]

make sense. You probably order from china, it is preatty fast indeed for 10 pcb and cost not that much.

[cyacoub]

Can anyone tell me what the point of the two BAT41 diodes at the input (going to ground and VCC) are for?

[OC26]

Protection. Input voltage swing limit.

[gigelmargel]

Value of C5 is for sure 100 nF? It seems to be huge.
I've built one using fuzzhead's vero, but it works strange: I have a lot of clean signal and a weak distorted signal in background. I have no TLC2272, but I tested other op amps (AD712, LM833, OPA2604), with the same result.