Dec 10, 2008

push-to-on/off switch

This circuit is a push-to-on/off switch.The first stage consisting of IC1(CD4013B) generates a high going pulse,while the second stage (IC2) is wired in toggle mode.When the switch S1 is pressed the relay alternately energies and de-energies.The contacts of relay can be used to switch on/off an appliance.In place of CD4013B CD4027B can also be used to realise the bistable operation.Supply voltage of 5V to 18V can be used to power the circuit.


components used:

  1. R1-4.7K
  2. R2-220K
  3. R3-2.2K
  4. C1-0.22u
  5. Q1-BC875
  6. D1-1N4001
  7. relay
  8. IC1-1/2 CD4013B
  9. IC2-1/2 CD4013B
  10. S1-push-to-on/off switch

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