Please Note:
New circuits are updated regularly and listed in date order on the update page. If you have problems try my help page and remember that most circuits on this site use SI Notation. Due to the volume of email that I receive each day, I regret that I can only answer questions about circuits featured on my site. You may find the Circuit Index useful.

For help or to submit a circuit please email me

  1. Basic 555 Monostable
  2. 5 to 30 Minute Timer
  3. Periodic Timer
  4. Asymmetric Timer
  5. 24 Hour Timer by Ron J
  6. Pulse Generator by Miroslav Adzic
  7. 24 Second Shot Clock by Milardo de Guzman
  8. Repeating Interval Timer by Ron J
  9. Repeating Interval Timer 2 by Ron J
  10. 1 hour Timer
  11. Sequential Timer by Ron J
  12. Op-amp Astable Timer
  13. 24 Second Shot Clock Mk2 by Milardo de Guzman
  14. Repeating Timer No 7 by Ron J
  15. Repeating Timer No 8 by Ron J
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