The Slow Gear emulates a guitarist riding the volume pot or a volume pedal, creating a swell effect. This will fit comfortably in a 1590B or 125B, though with the 1590B you'll probably want to wire the pots off board or use long-leg right angle pots mounted on the component side. Here's the schematic for reference.
Thought this one was interesting so I gave it a go. It's a fairly typical Rockett overdrive (.45 Caliber, Animal, Blue Note, etc.) with a fairly typical MOSFET boost (AMZ Booster, EQD Black Eye, etc.). Fits in a 125B with dual footswitches. Schematic and discussion found here. Fabricated version available on the store.
Happy Fuzz Friday, all! Here's a cool silicon Tone Bender style fuzz from Solid Gold Fx. Aside from using silicon transistors, the first stage is a JFET. When the switch is closed it adds in a 4.7uF input cap in parallel with the 330pF input cap. You could replace the switch with a B100k pot (lug 1 to Sw1 pad, lugs 2-3 to Sw2 pad) to blend the two values. Set the trimmer to 4.5v for the JFET and adjust by ear as needed.
The blog needs more modulation, so here's the classic EHX Small Clone chorus. Made famous by Kurt Cobain, the Small Clone has a wide range of chorus tones. I've laid it out two ways, one stock, and one with the Depth switch replaced with a pot. You can probably squeeze this into a 1590B, but I'd stick with a 125B if you want the board mounted to the pot(s). Schematic for reference.
Here's an interesting take on the classic DOD 250/MXR Distortion + circuit. It's pushed by a simple BJT boost and has an added presence control and tone switch. Schematic here. Easy to fit in a 1590B or 125B.
Happy Fuzz Friday, everyone! Here's a very cool Big Muff variation designed by Zzoyd. Zzoyd lives in Kyiv and named the circuit after the famed fighter pilot defending the Ukrainian skies from Russian aggression. It reminds a bit of the Musket but with a 2-band EQ and a germanium pre section. Should fit nicely in a 125B.
Almost didn't draw this up since it's just another Electra variant, but they almost always sound good, so why not? This one claims to emulate the sound of EL34 tubes, which sounds like marketing gibberish to me since it's just a diode-less Electra. Originals are all hand wired, point to point, floating in the 1590BB enclosure. Super cool looking, but a major labor of love to produce, hence its hefty price tag. This will fit in a 1590B, but has 2 footswitches, so the drill template reflects a zVex-style of layout. Schematic and cool teardown vid on FSB here.
