Infrared Alarm by LM567 LM308

Receiver

Transmitter

This circuits consist of two parts, the first part will transmit a signal, and the second part will detect that signal and trigger a relay.To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click. You can increase range by using a high output LED for LED1. Bright light will stop the receiver from responding to the transmitter.

Interface Circuits by IC LM324
Infrared Transmitter by IC LM324
Gate Alarm by IC 4011

Read More Source:
http://www.newcircuits.com/circuit.php?id=sec002
Thank you.

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