Month: July 2018
Build an Audio Probe to diagnose Pedal Problems
Audio Probe This is very simple yet very useful tool for debugging new pedals. You need one 1/4″ mono plug, one 100nF capacitor, alligator clip and some wire. Connect alligator clip to jack shield and 100nF cap to jack tip. When debugging some circuit connect clip to circuit ground and use other end of cap … Read more
Sentinel
The Sentinel is a PT2399-based pitch modulator, delay, reverb and drone verb designed by Arnoud Philip (~arph) as part of the DIYSB 10th Anniversary design contest. It’s based on the Sewer Pipes ring-verb and the Noise Ensemble. Original thread here, schematic here. Should be able to squeeze it into a 1590B. Note: LED2 in the … Read more
Ashbory Bass Preamp
The Ashbory bass was first introduced in 1986 and is/was a half scale (18″) fretless travel bass with a piezo pickup and built in preamp. That preamp is essentially a Baxendall tone stack feeding into the volume control, into an op amp based gain stage. I stumbled across the schematic and thought it would be a … Read more
Ethos TWE-1
Info: “Inspired by the Trainwreck Express amplifier (built by the late Ken Fischer), the TWE-1 is solid-state pedal designed to emulate the touch-responsiveness and clean-to-overdriven range you get from a high-grade tube amp. Along with Volume, Hi Cut, and Gain controls, the pedal has 3-position Cab switch (4×12, 2×12, off), a Presence switch that provides … Read more
DOD FX25 Envelope Filter
Schematic available here. Added a second layout with Mark Hammer’s mods from the DIY forum (here).
DeadAstronaut Black Triangle
Got another take on the bufferless Tube Screamer. DeadAstronaut has added some extra tone shaping options for tone, gain, and clipping. Pretty versatile tones on tap from light drive into heavier territory. He’s also got a PCB with board mounted pots and switches for sale on his site here if you don’t feel like wiring … Read more
GTC Bloody Finger
Original PCB and Schematic available on the PedalPCB website here. Review and info available here.
Parasit Studio 8-Bitar
For Fuzz Friday, here’s a really cool design from Parasit Studio: The 8-Bitar is a minimalistic octave down pedal with a 8-bit sound (glitchy and gated square wave fuzz). It’s small enough to fit inside a 1590A without any special parts.The design goal with this pedal was to achieve the core octave tone from the … Read more
Pigtronix Fat Drive
Here’s an interesting one from Pigtronix. It uses a TL072 to push a CD4049, which is followed by another TL072 pushing a Rat-esque tone control. All the gain stages make for natural compression and tube-like tone without using clipping diodes. Schematic for reference on FSB here (note, I’ve linked the inputs of the unused stages of … Read more