Grating circuit for perforating and sampling

Published:2012/8/16 1:10:00 Author:Ecco | Keyword: Grating circuit , perforating , sampling | From:SeekIC

The circuit is mainly composed of the LD261 photodiode, phototransistor BPX81 and following connected amplifier BCY58. If the light is reflected to the phototransistor through the punched tape or bulkhead hole, the pipe and following connected transistor is conduction to form a current which is about 8mA, and voltage Ua on resistor R3 is about 3.2V. If there is no light irradiation, the current is only 1mA. The maximum bright, dark current ratio is about 1:8.



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