Circuit Sweepings

A compendium of circuits, ideas, tips, tricks and odd stuff


+9V *and* -9V from one battery!

+18, +25, or +33 from one 9V battery

Single Pot LFO's for Univibe, Trem Face, EAN Trem, others

Designing bias networks to provide Vbias in effects

Out of Phase LEDs for an LFO

When good opamps go bad...

The Adjusticator

What are all those parts for???

High input impedance in an *inverting* opamp stage

A Variable Stuttering Pedal