Combination Lock

Electronic Schematics > Security and other sensors and detectors > Combination Lock

---

This circuit is very basic to build. To open a lock which is connected to the K1 Load, you must press each momentary switch in the correct sequence. The sequence used in this circuit is S1, S2, S3 and finally S4. If any of the other switches are pressed the circuit will be reset and you will need to start over. Depending on how you wire the switches, you can use any 4-switch combination.

Title: Combination Lock
electronic circuit
Source: unknown
Published on: 2005-08-27
Reads: 1542
Print version:

Other electronic circuits and schematics from Security and other sensors and detectors

---

• Factory Siren

• Power supply failure alarm

• Light/Dark Detector

• Beeper

• Ultrasonic switch

• Metal Detector

• Room Noise Detector

• Electronic Lock

• Low Voltage Alarm

• Melody generator for greeting cards