A 5-loop, MIDI-Controllable Switcher

An Infinitely Tunable Guitar Pickup System

A dual channel LM386-based Preamp

A compact relay bypass module for effects

Greatly Improved LM386-based Sustainer Circuit

Circuit Test Box with Lots of Features

A PT2399-Based Reverb Pedal

Guitar Sustainer Project Based on Original Sustainiac Stealth Sustainer

Stereo Triple Tracker with Effects Loops

A Simple PT2399 Ducking Delay

Brick-Based Ducking Reverb

All Analog Ducking Spring Reverb

Dual Delay and Reverb Workstation

Synchronized Vibrato and Tremolo Pedal

PT2399-based EP-3 Workalike

A Digitally-Controlled Analog Kick Drum Machine

A PT2399-based Oil Can Delay Effect for Guitar

A Better DIY Sustainer Circuit

A PCB for helping with ATTiny programming via Arduino Nano

A Digital Kill Switch Controller

DIY PT2399-Based Stereo Tri-Chorus