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Maybe you are overheating the componentes when soldering them? Pictures could go a long way here..

If using X7R, select the bigger size possible (according to the design and design needs) to avoid the capacitance variation with DC voltage applied. Also, X5R and X7R have piezoelectric characteristics (microphonic), so are avoided in the signal path if possible. COG have no piezoelectric...

ChatGPT is great help for this. Also, if you can get 1k5, two in parallel gives you exactly 750ohms

RoHS international laws sometimes make no sense, considering modern batteries generate lots of contamination and they are allowed. Even heard once that chinese battery toys started to include batteries just to make the contamination from the batteries anothers country problem. From our world...

That would be great!

These 2 are actually related. The impedance you can see as how easily current can flow to/from a point in the circuit. An output of an opamp, the emitter on a Bipolar transistor, ground, etc. are nets that can take/deliver high currents, and those are ideal for long traces. In the other hand...

Instead of worrying some much in aesthetics, I would consider functionality. Try to have ground fill. Good for noise and signal integrity. Keep high impedance nets' traces short. Low impendance nets can be long and not have induced noise. Keep the feedback networks on amplifing stages as close...

I suspect the first versions of the Diezel pedal may be different from the later units. A good start point could be opening the pedal, and just take pictures. No warranty or devolution policy should be affected by doing this, and we will be able to help you from the pictures a lot more

Closes to flat setting: Presence and deep in 0. Bass and Treble at 0. Mids at 10.

The relay coil is connected directly to V+. If you want it to switch, you need to use the output signal from the 555. And check the 555 connections, some stuff is connected incorrectly. Compare it against the standard bistable 555 circuit.

I used KiCAD on windows, linux and mac, and I have nothing but good things to say about it. And it's not only free, but open source!

Nice! I didn't like the changes from kicad 7 to 8, but I think I'll keep using it for some more time before upgrading to 9 (at least until they fix the expected *.0.0 bugs).

https://www.pedalpcb.com/product/pcb519/ Could you, please, share the schematic for the "Basic Relay DPDT Switch (Latching)"? Thanks

The Aion FX DZ4 has a redesigned power supply. Maybe you can get something similar using a charge pump IC (similar to the klon centaur one). Regarding the voltage requeriments for the VH4 pedal, it has been previously discussed on this thread: 'Valhalla - 9v? 12v? 18v?'...

Yes. You can get differences as big as 40dB easily from a single coil low-output pickup to a high gain HB pickup. It's not only the pickup itself, but the height setup, the string gauge, the pick (plectrum) used, and definetly the player. If you have enough resolution at your ADC, I would set...

Didn't read you fully. Sorry. But the following links may be useful for you: https://sound-au.com/articles/active-filters.htm https://sound-au.com/articles/eq.htm https://sound-au.com/articles/gyrator-filters.htm Consider this design has not constant Q on the bands, so I would recommend you go...

One for on/off. Effect on is led on. Other for channel switching. I would assume channel B is led on (the schematic does not show the switching)

https://docs.pedalpcb.com/project/PedalPCB-ThermionicDeluxe.pdf According to this doc, one switch is bypass, the other is channel switch. Each switch has its own led

We already worked with @joelorigo to get this reverse engineered, but I forgot to post the results. I generated a PDF document with screen captures of the LTspice schematic and simulations for the EQ part of the schematic of the: GE7, GEB7, GE7B, and the XTS modded GE7...

Gain is the same for both. Only the EQ curves change. Probably the od808x curves filter less overtones, and that's why you percieve more drive. You can try shorting the 51k resistor in series to the drive pot. That way you will get lower gain positions in the drive pot. If you find the final...