Optical proximity switch circuit diagram

Published:2011/5/22 0:06:00 Author:Lucas | Keyword: Optical, proximity switch | From:SeekIC

The optical proximity switch circuit consists of the photosensitive resistor RG, varistor RV, transistors V1 and V2, resistors R1 ~ R5, capacitors C1 and C2, voltage regulator diode VS, thyristor VT and diodes VD1 ~ VD5 etc. the circuit is shown as the chart. RV is the pressure sensitive resistor for protection to prevent the surge voltage shocks. During the turn-in VT, the 6V voltage on the VS can provide working power for the optical circuit by R7. R1 ~ R5 select 1/4W metal film resistors. RC uses the photosensitive resistor with light resistance being less than 20kΩ, the dark resistance being greater than 500kΩ . RV uses 270V varistor. C1 uses high-frequency ceramic capacitor or mica capacitor; C2 uses the aluminium electrolytic capacitor with the voltage in 16V. VD1 ~ VD5 use 1N4007 silicon rectifier diodes. VS selects 1N4735 (1W, 6.2V) silicon voltage regulator diode. V1 and V2 use 59013 silicon NPN transistor. VT uses MCR100-6 intergranular tube. KA uses intermediate relay with the coil voltage in DC 220V, and the current capacity on its contact should be based on rational power of load.



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