Frequency selective photoelectric relay circuit

Published:2012/10/21 22:51:00 Author:Ecco | Keyword: Frequency selective , photoelectric relay | From:SeekIC

The circuit can use modulated optical signal to control the relay. The modulation frequency is approximately 2.7kHz, and the selectivity of receiving circuit is determined by two parallel T-network. The parameters of RC elements decide narrow stopband with 2.7kHz center. Figure a shows controlling the circuit for transmitter portion of the circuit, and it uses a GaAs light emitting diode CQY12B, and two transistors constitute a multivibrator with 2.7kHz resonant frequency, and it outputs the rectangular wave pulse. It uses 250Ω potentiometer to accurately tune frequency.



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