Laser Tripwire and Alarm Using Snap Circuits

  • By
  • 12/18/2012 @ 11:04 pm

In this article you will learn how to build a laser tripwire and alarm out of Snap Circuits. You will build two circuits: the laser tripwire circuit and the alarm circuit. The alarm is a very simple two-transistor oscillator that is switched on by the relay in the laser tripwire... Read more »