Photoelectric photometry switch circuit diagram

Published:2011/6/27 4:56:00 Author:Ecco | Keyword: Photoelectric, photometry, switch | From:SeekIC

After the power switch K is turned on, beat pulse generator and audio oscillator pulse will begin to work. In the part of beat pulse generator, YF1 and YF2 output pulses have opposite polarity. With the output of oscillator pulse, light emitting diodes LED1 and LED2 alternately emit light, and the flash cycle is ​​determined by R3, C1 values; in the part of audio oscillator, the oscillation voltage is ​​determined by the output end of YF4, then HTD issues single-frequency sound, and the audio pulse frequency is ​​established by the R7, C2 values.



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