Austone Textone Fuzz Nutz

Here's a cool circuit for Fuzz Friday. It's supposed used by Billy Gibbons from time to time and it's a silicon Tone Bender of sorts. It uses 2SC1815Y transistors that have a gain range of 120-240 hfe. Other transistors can probably be used, but mind the BCE pinout.

BearFoot FX Blueberry Bass Overdrive

Being primarily a bass player myself, I've wanted to build this one for a while, but didn't really feel like messing with all the off board wiring of my first layout of this circuit. So I've drawn up a new layout with board mounted pots. I've also subbed a 2N5457 in place of the stock 2N5952 because it's what I have in my personal stock and I order from parts suppliers enough already (haha). If you do use a 5952, mind the pinout as it's SGD, whereas the 5457 is GSD.

Wampler Faux Analog Echo

Today's layout is Brian's take on the PT2399-based delay. It's similar to many other PT delays, but is it's own beast. It can do anything from simple slapback delay to up to around 500 milliseconds of delay. I've laid it out for board mounted pots and it would be a snug fit, but i'll fit in a 1590B (especially if you use low profile jacks).

Schaller Fuzz

For Fuzz Friday I give you a fun little circuit built in West Germany in the late 60s and early 70s–the Schaller Fuzz. It's a silicon Fuzz Face variant and sounds rather good. Originals used BC109B and 239B transistors, but modern equivalents would be BC549B or 550B. It's laid out for onboard pots, but if you feel like using hookup wire, you could probably fit it in a 1590a. Schematic can be found here.

For reference, here's a schematic I drew up based on Peter Ginidis' comments below. Seems the one floating around the web isn't clear on the pot lug numbering.

CultureJam Box of Hall

Here's a great sounding reverb designed by CultureJam, built around the typical Belton BTDR-2 reverb brick. I've laid it out for onboard pots and the BTDR-2 being mounted from the solder-side of the board.

DeadAstronaut Bassman Preamp

Here's one for my fellow bassists out there. It's a transistor-ized version of the Fender Bassman preamp as modified by DeadAstronaut over on DIYSB. It's laid out for board mounted pots and switch and will fit nicely in a 1590B.

Keeley Fuzz Head

Over a decade ago Robert Keeley was kind enough to share this design with the DIY community. It's a fairly unique fuzz, with a germanium treble booster at the beginning, a differential amplifier in the middle, and a basic buffer at the output (this is so it will play nice with other effects). Robert's full explanation of the circuit can be found here, however note that the schematic in that document isn't what I used. I used this later one with a tone control, and ended up laying it out with all controls externally. The PreGain control originally was a trimmer because it has a tendency to crackle when turned, but for ultimate tweak-ability I moved it externally.

The switch is a SPST on/off, by the way.