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This is most probably from the wire collecting the noise from the LFO. Try moving the wires while the pedal is on and see if it changes the noise. Better use shielded wires to solve this.

Only one side is connected to circuit ground, not both sides. One side connected to the input jack ground and the second side connects (the jack ground) to the circuit ground which is common practice (at least it is my practice...). All grounds must be connected together. Same practice should be...

Also made the Tyrian. Great pedal! Thumbs up.

No, it uses standard 9V and an internal charge pump and regulator to create +15V and +18V.

These are Dupont connectors. Can be found on eBay or: https://www.taydaelectronics.com/connectors-sockets/wafer-housing-crimp-terminal/serie-2500-2-54mm/crimp-connector-housing-2-54mm-1-pin.html https://www.taydaelectronics.com/female-dupont-crimp-terminal-connector-pins-2-54mm-html.html I...

Made a Lamb Chop this weekend. Very nice pedal, many options I still have to explore. Seems more gainy than the original way huge pedal, maybe because the transistors I used are ~400 HFE but very good sounding and tons of headroom. The switch breakout board is connected to the main board using...

This is what I use:

Exactly!

Looks like the switches solder joints require additional soldering.

Did the mod as recommended. Worked like charm. GREAT sounding drive pedal. Thank you.

Thanks. Just coincidence. My Tantalums are stored in the same bag as the Electros and the first baggie that stood out was the 2.2UF tantalums. So I had to use them :)

Thanks! To my ears the H1 sounds warmer and fuller. I favor it over the Abyss. Can be partially due to it being lamp driven rather than Led. This is why I have a pedalpcb Photon Vibe board already, which is also lamp driven. Once I build it, will compare the 3 :)

Thanks! If you like good vibes :) I also recommend the Harbinger One by Madbean. Try it, you will not be disappointed. It cannot be done on vero though...

Two great circuits just finished. Angry Charles V3, OD/Dist: The Abyss vibe (based on EQD The Depths):

Project name Deofol, Okko Diablo Plus Description of the problem (What does it do? What does it not do?) Pedal creates a loud high pitch whistle when engaged. Replaced the transistors and had the same result. The pitch of whistle changes when the gain/level knobs are turned but always...