D*A*M GB-83 GreaseBox

This is the silicon version of the GB-80. The darlington pair of transistors in the GB-80 aren't needed as silicon transistors have enough gain, and the rest of the circuit has just been tweaked for the silicon transistors. One problem people seemed to have cloning this circuit over on FSB was biasing the transistors properly. The 260k resistor from the base of Q1 to ground could either be socketed and experimented with to get the right value, or replaced with a 500k trim pot to dial in the right sound. The transistors in the originals are BC series, but socket and experiment. Anything in the 300 hfe range should work for Q1 and 400 hfe for Q2.

D*A*M GB-80 GreaseBox

Here's the germanium version of D*A*M's GreaseBox fuzz. It's based on the Tone Bender Mk. III but without the tone control. Q1 and 2 form a darlington pair to amplify the signal, and Q3 provides the fuzziness. The original units are positive ground effects and use PNP germanium transistors. That is reflected in the perf side of the image below, but for the PCB, I laid it out for negative ground for those of you who (like me) have a bunch of NPN germaniums.

Dwarfcraft Devices Robot Devil

Got a request for the EQD Bit Commander, and while there doesn't seem to be a schematic for it, my search for one lead me to this effect. It's no Bit Commander, but it does do the synth-y octave down thing. The original Robot Devil has the octave switch (which allows you to switch between one octave down and 2 octaves down) as a footswitch. If you go that route, you'll need to use a DPDT if you want LED indication. Or you could just use a toggle SPDT if you want to put it in a 1590B and don't like the idea of having 2 footswitches on such a small box.

Here's how to wire the octave switch as a footswitch with LED indication:

As is, the LED turns on if the sub octave (2 octaves down) is activated. If you wanted, you could use 2 LEDs (or a bi-color LED) to indicate which octave is in effect. Just connect the cathode of one LED to lug 6 (anode to +9v via 2.2k resistor) to indicate 1 octave down. 

Greer Amps Green Giant

Needed to do a simple circuit after all those involved 6 onboard pots layouts. They're exhausting ;)

This is Nick Greer's take on the classic Electra Distortion, but with one simple twist: the Blend control allows you to blend in the clipping stage. Expect some volume loss with the diodes blended into the signal, but it will give a bit more crunch and compression.

Laney Super Group Emulator

This was a request that came in from Cody from the They Remained Silent blog. It's an emulator of the Laney Super Group 100 watt head designed by Heuller Pinson (MallerMB). I would assume you should bias the JFETs to ~4.5v then adjust from there. Don't have a ton of info on this other than that. This one's laid out for onboard 9mm pots mounted from the solder-side. Cody asked for it to fit in a 125B, but you should be able to squeeze it into a 1590B.

Here's the schematic if anyone wants it.

Blackout Effectors Musket Fuzz

The Musket Fuzz is a variation of the classic Big Muff. Based on a Black Russian version, the Musket adds a modified LPB-1 booster (the "Pre" section) that pushes the standard BMP circuit. The "Focus" control allows you to pan between 2 different capacitors at the input of the first stage of the BMP. The Musket also adds a "Mids" control to the tone section, allowing you to dial in and be heard in the mix.

This layout allows you to use on-board, solder side mounted, right angle pots, though long-leg pots could be mounted on the component side as well.

Moosapotamus 360 Fuzz

Here's a bass fuzz designed by Charlie Barth from Moosapotamus.net based on the fuzz section of the classic Acoustic 360 bass preamp. It uses a mix of silicon and germanium transistors. I've made the layout to reflect the combination of transistors specified in Charlie's schematic, but socket and experiment. This layout should fit in a 1590B, but if you want to use a larger enclosure, there's a PCB of this effect for sale here with board-mounted pots.