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Yuck

I don't think a DIY solution would be better than the miniDSP. It has a 400MHz floating point Sharc DSP. Maybe you can get something to work with a ADAU1701 or similar DSP, but it wont be better than the miniDSP

If you just want to implement filters for an soeaker system, should be ok. Keep in mind the IC limitations, the first 3 I can think of are: - You only have 2 outputs, so the limit is a two way speaker, or HPF for stereo signal. - Not enough processing power for coeficient calculation, just...

Instresting that they didn't use a BMT tone stack on a preamp design, and they kept the distortion pedal topology.

Aren't these amps that have the class D power stage designed by Synergy? Apparently their response is lots better than a generic TPA power board

For softer clipping, you can add a resistor in series to the diodes. Make the resistor equal to R1, and it should behave like typical soft clipping (gain of 0db at min gain)

On an inverting opamp stage, the noninverting input is connected to a DC reference (noted on most pedal schematics: Vref, Vbias, V/2, etc) in between the power rails of the opamp (+Vcc and -Vee). In the case of 9v powered pedals, the opamp is working with Vcc=9v and -Vee=0v. That makes the...

The most difference will be the ones on IC2A. The last stage. For the first one, you can just ignore the switch. Give a chance to asymmetric clipping, it will give more natural dynamic response (softer transition from clean to clipping)

The first one should be more like this for traditional clipping:

It's based on the Orange Squeezer compressot + mods. https://forum.pedalpcb.com/threads/wampler-ego76.21266/post-276368 All orange squeezers have a trimpot for bias.

The 2 modes are EQ related (just filters), not gain/distortion related.

Gain comes from these 2 stages: For the IC1A stage, I would use 2 LEDS in parallel (with opposed polarities) on the R4 (is an inverter opamp stage, so is hard clipping, even in the feedback loop), And for the IC2A stage, I would add a current limiter resistor to the output and use 2 LEDS on...

Mic always goes first into the preamp.

(Just in case, you can find some mods documented here: https://tonepad.com/project.asp?id=53 )

This. The input HPF is below 10Hz, and the output should be even lower on most cases, so the full signal goes through. The only consideration to avoid low frequency artifacts (the usual rumble) would be to modify the RC HPF (High Pass Filter) before the delay line: This cuts off the lows at...

Define if you need a preamp for the microphone. If the microphone first goes to a preamp, then the reverb pedal input will be line level. Is different to guitar pedals, since usually for microphones you have first a preamp to amplify up to 50-70dB the signal while keeping a good signal to...

Asymmetrical clipping to emulate tubes is on point on this design. Now I want to build one!

EE here. I'm currently working on development and automation of chip design and verification flows for a satellite company. I use chatGPT all the time, is like having a genious intern for free!

>90% of the problems come from cheap pots, jacks and switches, and handwiring. Use good quality components and use a PCB for the 3PDT. That will cover most of the issues.

Are both leds lighting up when working? I would directly go for replacing the 2 leds and the spdt switch.