8 Opto-isolated Relay board

This is a 8 channel relay interface board using ULN2803. All the relays are opto-isolated using optocouplers and can be controlled directly using a microcontroller of any kind (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) or a PC.

It’s easy to manufacture and have three pin screw terminals for easy connectivity.

Schematic

The full schematic is shown below

Photos

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