Frequency multiplier

PHOTOTRANSISTOR INFRARED RECEIVER CIRCUIT SCHEMATIC CIRCUIT DIAGRAM

PHOTOTRANSISTOR INFRARED RECEIVER CIRCUIT SCHEMATIC CIRCUIT DIAGRAM

The circuit is designed to be unaffected by daylight. That is, the circuit can sense infrared rays with a frequency of only 2.7 kHz thanks to capacitors and resistive filters. In order to operate the relay at the output, 2.7 kHz beams should be sent from the transmitter circuit. A simple 2.7 kHz infrared transmitter circuit is sufficient to operate the circuit.

The 2.7-kHz, square-wave radiation from the transmitter is detected by the phototransistor.
A square wave of the same value of the transmitter frequency is formed in the collector of the phototransistor, which is continuously the emission cutoff. These square waves are rectified by a capacitor of 4.7 mF and 1N4001 diode. With DC current, the T3 transistor is activated.

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