Adjustable photoelectric isolation circuit

Published:2011/6/8 6:27:00 Author:chopper | Keyword: Adjustable, photoelectric isolation | From:SeekIC

This circuit modulats(modulation frequency is about 1400HZ ) the optoelectronic isolator FPA103 produced by XianTong company and demodulates the singal from detector,in order to make optoelectronic not sensitive to fluorescent lamp light but not to decrease the performance.R1,C1 regulates the voltage controlled oscillator of PLL integrated circuit within 1400HZ around,741 operational amplifier converts the triangular wave of phase-locked loop into the square wave whose duty ratio is 50%,and drives the LED of optoelectronic isolator through Q1.



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