• A switch is a device which mechanically connects or disconnects a circuit.
  • SPDT switches are also known as toggle switches.
  • Tilt switches often only have a metal ball bearing and two naked electrodes within:
    • When the switch casing is tilted, the ball bearing rolls towards the electrodes, when contact is made with both electrodes, the circuit is completed.
  • Refer to this link for more information on switches: http://www.kpsec.freeuk.com/components/switch.htm
  • A latching or latch switch is a switch that maintains its state after being actuated:
    • For instance SPST, SPDT, DPDT:
      • Also remember to learn the differences between the component symbols for these switches.
    • But not a push-to-make or push-to-break.

Staircase SPDTs:

Staircase SPDTs

  • The switch in this circuit allows you to turn the lights ON and OFF no matter which switch you are standing at:
    • Useful for staircase lights, because this means that one would not have to ascend, or descend, the staircase just to turn ON, or OFF, the lights.
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