Lovepedal Dover Drive

Here's a pretty interesting overdrive from Lovepedal (Hermida). The signal goes through a dual PNP silicon transistor stage (don't worry, it's still a negative ground effect), then into a op amp gain stage with soft clipping in the feedback loop, with a Rat-style tone control, followed by an output buffer. Schematic can be found on FSB for reference.

Parasit Studios Eagle Claw

Fuzz Friday! Freppo over at Parasit Studios makes some insanely cool stuff. Here's his Eagle Claw octave fuzz. You can probably squeeze it into a 1590a if you're feeling adventurous. In his own words:

The Eagle Claw is simple yet brutal, noisy and glitchy sounding CMOS-based fuzz with a full wave rectifier to produce a strong octave up. This circuit works best with high output pickups. It is a gated circuit by nature of the CMOS logic. If you are using single coils and need more sustain, try a boost or compressor in front. To bring out the strongest octave up, use the neck pickup on your guitar with the tone rolled down. The octave is most intense around the 10th fret and higher.

iRig Preamp

Got several requests for this one. Basically, it's small preamp to plug into a mobile device for use with apps like iRig. Pretty simple circuit. Shouldn't be hard to fit in a 1590a or even smaller since you don't need to include a footswitch.

AMZ Son of Screamer

Where would DIY pedal building be without Jack Orman? Got a request for his Son of Screamer, which is a pretty standard Tube Screamer but with the input and output buffers removed. Pots are board mounted and I added a extra diode in the feedback loop for asymmetrical clipping if you want to go that route. Original schematic and article can be found here.

If you want to have symmetrical clipping, populate the diodes like this:

Höfner Buzz Tone

Pretty unique fuzz box from Höfner for Fuzz Friday. Pretty straight forward 3-transistor design that should make for a pretty easy build. Board mounted pots for less off-board wiring and if you want a bit more gain, replace the 47uF input cap on the left side of the board with a 22uF cap. Here's the schematic for reference.

Zombie Chorus

Got a request for this one. This was originally designed by John Hollis and has since been modified by various folks in the DIY community. Like the latest version of the Little Angel chorus, it has a switch to do either vibrato or chorus tones. And the Mode switch allows for different speeds (Leslie, Normal, and Clone). Here's the schematic for reference.

Keeler Push

Here's a recent trace from over on FSB. It reminds me of a Timmy with a fixed bass control and modified second op amp stage. Nice alternative to a Tube Screamer.