The grid circuit of threshold switch

Published:2011/7/10 9:48:00 Author:Seven | Keyword: grid circuit, threshold switch | From:SeekIC

The circuit can be used in situations of wide power supply voltage range 4.5~27V. The constant source of transistor T1, diodeS D1 and D2, resistors R1 and R2 and so on. A voltage which is irrelevant to the power supply but has almost constant voltage is generated on the basic pole of 2 diodes, the constant current is regulated by the resistor R2. If the current of the light sensitive transistor is more than 4 times of the threshold, the effect on the elements caused by the temperature or aging can be minimized.



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