The Relay Sub Board - Attach this board to the Simplified I/O Interface Board to provide all the functionality of the main 4 way relay board from the Robotics Kit.

Use nine pieces of hookup wire (or a piece of ribbon cable) to connect corresponding points on the I/O Demonstration Board to the Relay Sub Board. Connect 12 volts DC (smoothed) to the power input points on the I/O Demonstration Board. Solder in as many relays as you intend to use, each with its associated LED, resistor and 1N914 signal diode.

The board is designed so that it may be cut in two to make two separate boards, each with four relays. This should be more than adequate for most purposes.

The board may be cut in half

Overlay of Earlier Board

Parts List
8 (or less) 12 volt SPDT relays
8 x 3mm red LEDs
8 x 560 ohm 1/4 watt carbon resistors
8 x 1N914 (or similar) diodes
1 x PCB Relay Sub Board
Hookup wire