Build this DIY keypad operated switch using cheap off-the-shelf components.

COMMENTS SUGGESTIONS	Keypad Tamper Alarm - Photograph	MORE KEYPAD CIRCUITS

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

Circuit Board

This is a photograph of the Keypad Tamper Alarm circuit board. It's designed to connect to the Universal Four-Digit Keypad Operated Switch. A few genuine mistakes - made during code entry - will not activate the device. But repeated attempts to find the correct code by trial and error - will cause the keypad to lock-up - and sound the Alarm.

A Photograph Of Ron J's Keypad
Tamper Alarm - Circuit Board

Click here if you're new to constructing stripboard projects.

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

Keypad Tamper Alarm - Photograph

Circuit Board