Build these Keypad Switches using off-the-shelf components. Although designed to control a Burglar Alarm - they will have other uses.
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Connecting the Keypads to the Modular Alarm

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KEYPAD CIRCUITS

Modular Burglar Alarm Schematic The Rest of Ron's Circuits Write To Ron More Free-to-Use Circuits Circuit Exchange International


Connecting the 4-Digit Alarm Keypad to the Modular Burglar Alarm

Four-Digit Keypad To MBA

Connecting the 4-digit keypad to the Modular Burglar Alarm


Connecting the Enhanced 5-Digit Alarm Keypad to the Modular Burglar Alarm

Five-Digit Keypad To MBA

 Connecting the 5-digit keypad to the Modular Burglar Alarm

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