This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Thursday, March 28, 2019

MI Audio Tube Zone

Here's the Tube Zone distortion from MI Audio. Original has 6 knobs with the Presence pot internally as a trimmer, but I know how you guys like to fiddle with knobs, and the layout was turning into a 1590BB size anyway, so I made it external. Schematic available on FSB.

Tuesday, March 26, 2019

Keeley 1962

Take a Blues Breaker and mash it between two Katana boosts and you have the 1962. Couple minor differences from a typical Blues Breaker beyond that. Trace over on FSB. There are two versions of this circuit, the 1962 and the 1962x. As far as I can tell, the only difference between the two is the clipping. I've added a DPDT toggle to switch between the two versions.

There's also a fabricated version in the store, the LXII.

A couple notes:

When I verified the fab'd version I didn't notice much difference tonally between the two clipping settings, so you may want to either leave it out or experiment with that section. I changed the value of the resistor from 9v to the drain of Q3 from 47k in the trace to 22k. Wouldn't bias properly otherwise. Also for the caps with questions marks in the layout above I used 10nF, except for the yellow cap to the right of the IC, which I used 100pF.

Friday, March 22, 2019

Skreddy Fuzz Driver

Happy Fuzz Friday, everyone. Here's a modded Fuzz Face from Skreddy Pedals. Early versions are all germanium and later versions are a hybrid germanium/silicon setup. Since it's so similar to a Fuzz Face, there's a lot of room for experimentation. Here's the schematic for reference.

Tuesday, March 19, 2019

May I?

Got a request for this one. Another AC30/Rangemaster emulator to try and get Brian May's tone. Here's the schematic for reference. It calls for "BC245/256" JFETs for Q3-4, but I think that's a typo and should have the BF prefix. Should work with other JFETs as well. So socket and experiment with the usuals—J201, 2N5457, etc.

Thursday, March 14, 2019

Yamaha DI-01 Distortion

This is currently on hold till I figure out the tone control issue or someone can shed more light on this circuit. Build at your own risk.

I stumbled across the schematic for this effect and thought it was another variation of the Marshall Bluesbreaker circuit. But realized it actually predates the Marshall circuit by several years. Korg made a re-labeled version for Yamaha, the DI-01, and both still fetch decent prices. Apparently they were built like tanks. Sounds pretty decent too. Not sure what clipping diodes were used, but 1N4148s are probably a good place to start. Easy fit in a 1590B.

Tuesday, March 12, 2019

Pink Jimi Photon 'Weetie Pi

Here's a really cool and versatile dirt pedal design by Pink Jimi Photon. He's made a lot of contributions to the DIY community and whips up some cool stuff. Check this thread on FSB for the schematic and Jimi's description of the circuit.

Friday, March 8, 2019

BJF Bone Bender

Happy Fuzz Friday! As requested, here's Bjorn's Bone Bender. Lots of great info and schematic in this doc. Should fit nicely in a 1590B.

Tuesday, March 5, 2019

Menatone Ms. Foxy Brown

Another Marshall-in-a-box, the Ms. Foxy Brown uses 3 J201s and feels a lot like an older Run Off Groove design (though it's not). As per usual, you'll need to bias the J201s to about 4.5v and then fine tune as needed. Should fit easily in a 1590B. Schematic for reference.