Relay Perc 2 manual

last update: 22 Feb 2026

This module is mainly designed to be a controller, but it can also make a base kick like sound.

The Relay perc 2 is a simple module, it has a audio output for the relay that amplifies the sound of the relay via a piezo.

The bottom 3 connect to the relay and can be used to switch a signal, the switch type is SPDT.

Specifications:
• Module width: 20mm (4hp), power consumption: +35mA -4mA.
• Gate input to opperate the relay.
• Audio out with volume adjust via potmeter about 10v pp.
• bidirectional SPDT switch; CO = common, NC = normally closed, NO = normally open.

Assembling:

Instructions for helping the assembly process.

1. Solder the IDC 2x5 header pin connector for power.
2. Stick the piezo onto the foam tape on the relay.
3. Cut off the sides of the piezo so it dost stick out to much.
4. (optional) spray paint the piezo.
5. Solder the relay onto the PCB (make sure its the correct side, it should be on the side where the SMT components are, look at the image to check)
6. Cut the wires of the piezo to the correct length and solder them to the PCB.
7. Cut the little annoying flap of the potmeter.
8. Put all components into the PCB, 1x LED, 5x jacks, 1x pot.
9. Put the font pannel on, mount all the nuts and solder.
10. Check if the volume is correct, if is to low, you can solder a 10k resistor into the "?r" resistor place (next to the GND connection of the piezo wire).