Humfree ABY

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There are two designs for an active, OPAMP and Transformer based A/B/Y switcher by GEOFEX

There is also a project file for the improved version available at General Guitar Gadgets, this page also includes specifications on the transformers used.

GEOFEX
Humfree ABY · Neovibe . SWTC
General Guitar Gadgets
BSIAB II · PT80 · Neovibe · Humfree ABY · Tube Screamer · Dynacomp · Small Stone · EA Tremolo