I ordered a GUMA drive kit from Schalltechnik_04 which is a Darkglass b3k clone and before I assembled it I'd thought I'd give it a go tracing it out to produce a schematic. If you do want to build this pedal I highly recommend buying this kit. It's a very well laid out kit.
First thing I needed to do was get some super fine pointed tips for my multimeter. I ordered these from Aliexpress. The multimeter I have used for this is a APPA 62 and I've just used it on the continuity function.
|Fine pointed tips|
I took a high quality photo of the PCB on my Sony xperia z3 and printed out a bunch of copies of it to help with the tracing.
|High quality photo.|
|The tedious task of tracing|
|Darkglass B3K Schematic. Updated 20/2/2017|
|PCB I have drawn up.|
Got around to building the kitset I based my trace on. My work it's a good overdrive
|Vashta Nerada - The Shadows That Melt The Flesh|
Updated the drawing as I had misplaced a resistor. R22 moved from above diode to between supply and pin 1 on the 4049.
I have made this effect quite a few times now. Schematic is verified. I've since made a new PCB that fits into a 1590B and can do the b3k and vmt by just swapping a few components out. I'm starting to make my own modifications on the circuit too.