|Prototype version of μPC1237 – 2 channel speaker protector system.
PCB design of this project is limit to 90mm × 43mm and based on through hole components. Depending on supplied voltage and relay, value of R7 resistor is need to be change. The specified value in schematic is for 24V AC power source and for Omron 24V G2R-2 relay. Start-up delay of this unit can be adjust by changing the values of R5 and C5.
Schematic and PCB design files of this project are available to download at elect.wikispaces.com.