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You can go higher, 33K, 47K, 68K, see how you like it. Decrease C14 to 47p or so if it gets too dark at higher resistances. IC3.2 is non-inverting so it would need a second resistor from pin 6 to VREF for that feedback resistor to have any effect on gain.

Output voltage peak to peak will be limited by the combined forward voltage of D3 and D4, so with volume and tone maxed it's not going to be more than 1.4Vpp, realistically even less than that. With the volume half way up that'll only be around 0.2Vpp. Pretty low. You could change D3 and D4 to...

JK, I don't know if these are fake. Hoping for the best, Stickman!

Are you happy with how the pedal "feels" and just want to increase the overall level of brightness? Or do you find the response, on the initial pick attack for example, too muddy and lacking definition? That will determine where in the circuit we need to let more high frequencies through, post...

Increase R24 to 1M-1.2M and decrease C19 to 1nF. That will give you about twice the output volume while retaining the cut-off frequency.

The question is whether it could hurt to put those LC filters there. Wish those tech notes weren't as bare bones and had some real life measurements. I came across some notes by Texas Instruments on filtering DC-DC converters today but haven't had a chance to check it out yet.

Curious about this. I'm currently working on a preamp design and will be using a Traco Tec series converter because I've had good experience with them in a couple of Aion FX PCBs. I would have just copied the Aion FX pi filter on the input, which uses a 100uF, 10uH and 47uF. Always open to...

Doesn't Mouser ship from the US?

That will depend on the effect circuit. If it draws only 5 mA, then Ohm's law tells us there will be a 0.5V drop across the resistor. That's not too bad. If your circuit draws 50 mA, that resistor is now dropping 5V. No bueno.

Check out this thread for some inspiration: https://forum.pedalpcb.com/threads/9v-protections-for-projects-with-a-voltage-doubler-muzzle-klon.22033/ You can also go very simple and use a zener reverse biased to ground. It will shunt any voltage exceeding the zener voltage directly to ground...

If you're using the zener like above, it's not going to provide overvoltage protection for anything down the line. D1 is only there to protect the MOSFET by limiting Vgs to 9V.

Will likely become more common for German online stores at least. DHL Germany suspended shipping to the US for all commercial shipments as well as private gift shipments if they're worth over 100 USD.

TC1044SCPA is rated for 12V maximum input voltage. I would advise against running it that close to max specs continuously. Also, not all power supplies are created equal. If the external power supply isn't filtered well, that noise can get into the pedal circuit. Also, running the charge pump...

What do those 10 Ohms extra resistance across the frequency spectrum matter if all the surrounding circuitry has impedances hundreds or thousands of times higher? A 100K 1% resistor alone is going to be +/- 1000 Ohms. There's a point of diminishing returns (for audio signals at least) even if...

In your example I'm guessing PWR_GND is a separate ground pour around the charge pump to help isolate the switching noise and prevent it from coupling into the audio signal. Power ground and signal ground then likely meet only at a single point somewhere around the main filtering capacitors...

Anybody got experience with Vishay DG469 analog switches? Link to datasheet below. Just need a second set of eyes to confirm I got the switching logic right (or not). So, with the IN pin floating, the n/c pin connects to common and the n/o pin is essentially left floating. And when the IN pin is...

These are available at Tayda. It's the matte black sand finish. I don't know exactly how the effect is achieved.

Correct.

Thanks, man. It's a cool pedal and very fun to play. Interesting circuit as well with those zeners in the clipping stages. A little on the dark side but R19 or C15 can be lowered to up the presence.

Thanks for checking out the video! I designed the enclosure in Illustrator from scratch, taking heavy inspiration from the original amps (fonts, knob scale markings, etc.). UV print job was done by Tayda. I overhauled the design a while ago, here's one I recently built: I'm running the pedal...