Search results

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.

Yes, same circuit response is expected. Both symmetric

There's extra capacitance and reverse bias current, but it should be small enough for the human ear to hear no difference. I like having the liberty of choosing one or the other, to wire an SPST to short diodes for a different clipping option (on topology 1 it will lower the threshold voltage...

Commercial != industrial Lots of DIYers sell their stuff. Call it boutique and ask chatGPT for fancy marketing words xD Just try to use good quality components (less failing), and develop a process good enough so that you don't have to put a lot of hours per pedal and avoid having to...

I would experiment on known designs using less feedback. When designing amplification stages, even with low gain, it is desired to use high hfe transistors with negative feedback. That compensates the big % variations of the between transistors (really good for mass production), and also makes...

HiFi chips are definitely overkill. In the zendrive design the clipping is done with the mosfets and schottky diodes in the opamp feedback loop. Chips like the TL072 already have good enough noise specs and slow rate for these applications. The only reason why I can think you might want to...

Yes, but is basically what you did here: The original design of the pultec EQP-1A was not meant to boost and attenuate the low frequency at the same time. This is directly from the operating instructions: But the studio engineers that used the pultec EQ because of its multiple controls and...

It does the pultec trick!