Boss OD-1

This is the precursor to the SD-1 and the TS808. The OD-1 was built by Boss from 1977-1985 and made in 2 versions. Both version are very similar in circuit topology—buffer > gain/soft clipping stage > gain stage > buffer—but the early version used a quad opamp, while the later version used a dual opamp and transistors for the buffer stages. I laid out the later version a while back (and didn't know the quad version even existed at the time), but I wanted to lay the quad version out as most agree this version sounds better. Fits nicely in a 1590B. Schematic for reference.

Foxx Select-A-Fuzz

Happy Fuzz Friday, everybody! The Select-A-Fuzz is a pretty interesting fuzz box from Foxx. It has a rotary switch to select the input cap (the larger the cap the fuzzier the effect), followed by a Fuzz Face-esque stage and an extra gain stage. Here's the schematic for reference with some good notes on alternative transistors and voltages. D1 is silicon in the original unit, but a germanium diode will take the edge off a bit.

Hermida/Lovepedal Mosferatu (3-knob)

Came across the schematic (here on FSB) for this and thought I'd lay it out. Essentially a Son of Screamer but with MOSFETs and germanium diodes for clippers, a modified gain control and a few value tweaks. FYI, the transfer pdf is in the Lovepedal folder, and use the AMZ Son of Screamer drill template.

Fulltone OCD V2

The latest iteration of the OCD has quite a few differences from the earlier models. There's an added transistor stage at the output after the volume control, and a JFET buffer that can be toggled for buffered or true bypass. I've laid it out so it will still fit in a 1590B with board mounted pots.

The off-board wiring's not the most intuitive, so here's a diagram for wiring up the buffer switch and 3PDT bypass footswitch.

Music Man Sabre II Guitar Preamp

Apparently the guitar players were feeling left out with the all the old Music Man bass preamps, cuz I got a ton of requests for the Sabre II Guitar pre. So here you go! Nice and small like the others with active bass and treble controls.

Fuzzrocious Ram the Manparts

Happy Fuzz Friday! Here's the now discontinued Ram the Manparts from Fuzzrocious. It's a 386-based fuzz/distortion with a voltage starve control, gain toggle, and volume control and sounds pretty killer on guitar and bass. Should be a quick build and a nice fit in a 1590B.

Music Man Sabre II Bass Preamp

Lot of requests for this one after I posted the Stingray pre a few weeks ago, so here's the Sabre II. Pretty similar the the Stingray but with a few value differences and extra resistor in the feedback loop, and the added bright switch.