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Pulse sound and light display circuit diagram

2016-12-03 09:50  
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Pulse sound and light display circuit diagram
Sensor is composed of the photosensitive resistors R1, R2, of which R1 is used to collect the amount of light transmission from the tip of finger, R2 is an automatic correction device. The resistors R1, R2 are transferred to equal conditions in advanced, the interference will generate the same resistance changes on the R1, R2, so the error caused by the work environment will cancel by each other. Shaping amplifier uses CD4069 to form the conventional 6-stage amplifier circuit. CD4011 forms the audio oscillator, piezoelectric sound, light emitting diode indicator.