Basic Relay Demo

This is a basic demonstration for using and understanding the relay.

Created by E7 Sal
Status: Active

What you need Step 2 of 5

Supplies needed:

  • 1- SPDT Relay
  • Breadboard
  • Alligator clips or wire
  • 2 - leds - different colors if possible
  • 1 - 680 uF resistor. 1K will also work
  • 1 - SPST push button or tact switch
  • 12v power supply 
  • Single row MM pin header strip
  • 12v power supply

It is also helpful to have a set of needle nose pliers, wire cutters, and multimeter. This demo can be completed without tools but they are helpful if when using a breadboard and custom power supply.


I modified an adjustable AC adapter with alligator clips. I cut off the connector, stripped the leads and taped alligator clips to the wires. It is very useful when supplying power to a breadboard.