Please Remember:
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. Frost Alarm or Cold Activated Switch
2. Dark Activated Switch or Porch Light Switch
3. Electronic Keypad by Ron J
4. Light Detector Circuit by Mick Devine
5. DC Push Button Motor Control Circuit
6. Push Button Switch Debouncer
7. Remote Doorbell Indicator
8. Doorbell with Counter
9. Digital Combination Lock
10. Electronic Night Light
11. Sound Operated Switch
12. Voltage Comparator Switch
13. DC Motor Reversing Circuit
14. Water Activated Relay by Marin Lukas
15. Triac Light Controller by Matthew Hewson
16. Negative Voltage Load Switch by Nicholas Choong
17. Voltage Controlled Switch by Miroslav Adzic
18. Camera Switcher by Milano de Guzman
19. Universal 4 Digit Keypad Operated Switch by Ron J
20. Keypad Operated Switch No.2 by Ron J
21. Electronic Door Release by Ron J
22. Light Controlled Relay Switch by Ron J
23. Schmitt Trigger
24. Temperature Controlled Relay Circuits by Ron J
25. Toggle Switch No. 1 by Ron J
26. Thermostat with Adjustable Hysteresis by Ron J
27. Toggle Switch No. 2 by Ron J
28. Latching Switch
29. AC Switch
30. Keypad Combination Lock
31. Toggle Switch No. 3 by Ron J
32. Electronic Switch
33. Latching Switch 2
34. Parking Light Switch