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Optotronic Bypass

Category: Utility
Price: €3.99in stock

Buy the PCB at TH Custom Effects Build document

From the vendor

A tiny replacement for a noisy 3PDT footswitch. Uses a photo-MOSFET optocoupler to switch the audio path silently while a standard DPDT latching switch handles the mechanics. No clicks, no pops, no signal-path moving contacts. This is a Voodoo -style true-bypass switching board in a very small form factor — about the size of the switch itself. It does the job of a standard 3PDT click-stomp footswitch but uses an optocoupler in the audio path and a standard DPDT latching switch for the mechanical action. The result is a bypass with the same routing behaviour you expect, but without the loud contact-clack you get from a hard-switching 3PDT. It's intended as a drop-in replacement: wire the

Schematic

The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 5 rows

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Ref	Value	Normalized	Notes
Resistors 1
CLR	4.7kΩ	4.7k	LED current-limit. Sets brightness for both indicator LED and optocoupler internal LED. 3k3 brighter 10k dimmer — pick to taste.
Capacitors 1
C1	100 nF	100n	MLCC ceramic, 2.5 mm pitch. Smooths LED-current edge during switch contact bounce.
Opto 1
OC1	CPC1017N	CPC1017N	Photo-MOSFET solid-state relay, SOIC-4 (SMD). Must be a photo-MOSFET / SSR type — bidirectional output is essential for audio. Through-hole DIP-4 footprint also accepts compatible parts. CPC1017NTR LCA110 AQY212
Switches 1
S1	DPDT latching	DPDT LATCHING	Standard PCB-mount or panel-mount latching footswitch. Alpha or Tayda parts both fit. Mounts on the opposite side of the board from the other components.
LEDs 1
D1	LED 3 mm or 5 mm	LED 3 MM OR 5 MM	Indicator LED. Any colour. Long lead (anode) goes into the square pad. 3 mm fits the silkscreen exactly; 5 mm works if oriented carefully.