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
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Schematics
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