Position: Index > Control Circuit >

The detection and alarm device circuit with laser rod

2015-03-03 16:05  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.


The detection and alarm device circuit with laser rod
Analog sound ICs form a receiving circuit, usually the laser emitted by laser rod is irradiated on photoresistor RG, RG shows low resistance, the transistor VT1 is cut-off because of base's low potential, then IC does not work, speaker Y does not emit sound. Once a person or object comes into the alert zone, RG resistance increases due to the less than light, VT1 base potential rises to get saturated conduction, then IC is energized.