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That's Bodhi. They call him Bodhizafa ...

I'd be open to making a custom HAT. We could do one designed for guitar.

Really nice work! The interface looks pretty intuitive to me. What about using other audio HATs? I've seen some that include a headphone or power amplifier.

Wowser, what a gorgeous build! That wiring work is first rate.

You can see the protection diodes for the OPA1678 on the first page of its data sheet. When I used to use the OPA1642, I'd add protection diodes on the input like you see in the schematic for the General Tso compressor. I blew up at least one hotplugging the input jack.

These are nice. Look out when using them rght at the audio input. I learned the hard way they don't have overvoltage protection on the input.

LF356 maybe? Edit: Just noticed it's also 10v min recommended.

Nope. The one HamishR is talking about got absorbed into Amplified Parts.

Did I miss something? Are clip-ons out of style?

That's a can of worms. 1. Budget DIYers love the challenge of building pedals as cheaply as possible. They typically advise buying the cheapest possible parts and argue that even if there is a difference in performance, it's not big enough to justify the ROI of pricier components. It's true...

If you don't mind SMD, check out the OPA1656.

That design has some issues. DM me and I'll PIF you my Ubu Roi. It's been in the closet for a while, so it's a little dusty. All the options are on the control plate and it corrects the signal inversion.

Super layout and boy that looks spiffy. You make those knobs look good!

Amplified parts is a great source. Just make sure you get the 6.3mm resistors and small box caps with 5mm lead spacing. They have enclosures, jacks, switches, ICs, transistors, etc.

Use the diode clipping setup from the Klon circuit. It's designed to be "leakage independent." People have always made a big deal about the "true" Klon diodes, when in reality it was specifically designed so it will work with any Ge diode you put in there. What you need is to drive it with an...

I thought Chuck had explained about diode leakage a few years ago and found the thread. The test circuit configuration will matter with Germanium and Schottky diodes because of that. Think of it like there's a resistor in parallel with the diode. Germanium diodes of the same part number and...

I'm just glad I can't remember how much I paid for those molecular junction clippers. I've still got a stash of those. I'm thinking about what might be a good circuit to do a one-time limited run for DIYers - King of Tone probably.

The Bohemia is really good. It's a BJT treble boost into two JFET mu-amp stages. I think tacking on a one-knob cab sim on the output to dial in the tiny speaker/tiny box sound could be a viable shortcut.

Ground should be the lowest impedance node in your circuit, which makes it ideal as a reference voltage. When you use any other voltage as a bias point, you're increasing the chance of noise in your audio from that voltage source. DC voltages can also be buffered in a similar way to AC audio...

Very cool! This is a new one to me. Did you try the BAT85s clipping diodes?