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  • Touch Switch

    This circuit uses a 555 timer as the bases of the touch switch. You can learn more about 555 timers in the Learning section on my site. When the plate is touched the 555 timer is triggered and the output on pin 3 goes high turning on the LED and the buzzer for a certain […]

  • Travel Touch Alarm

    The Travel Touch Alarm can be used to provide a audible alarmĀ  when someone touches the door knob or handle of your hotel room. The door knob or handle must be made of metal for the circuit to work. The main chip in the circuit is a 555 timer which will be triggered if a […]

  • Electronic Combination Lock

    This circuit is very basic to build. To open a the 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,S4. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Single Zone CMOS Alarm

    Circuit :Ron J Email Ron Description: This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Automatic Intruder Alarm

    Description: This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Mini Alarms

    Description: This is a selection of small self-contained alarm circuits. They have a very low standby current; and are suitable for battery operation. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Single Zone Alarm

    Circuit :Ron J Email Ron VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Water Level Alarm

    Circuit : Andy Collinson Email: anc@mitedu.freeserve.co.uk VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Enhanced 4 Digit Alarm Keypad

    Circuit : Ron J Description: VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Enhanced 5 Digit Alarm Keypad

    Description: This is an enhanced 5 digit keypad which may be used with theĀ Modular Alarm System. VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)