Constant current source for field contact input

Details Constant current source for field contact input Constant current source for field contact input

G - Physics

05

F

323/4, 328/114.1

G05F 3/18 (2006.01) H01H 1/60 (2006.01) H03K 17/74 (2006.01) H03K 17/78 (2006.01)

Patent

CA 1192966

ABSTRACT OF THE DISCLOSURE A circuit acting as a constant current source comprises a transistor having an emitter to base junction forward biased by a voltage of from 24 to 125 volts DC. A 5.6 volt Zener diode is connected between the base and voltage supply and a light emitting diode is connected between the collector and a field contact. A substantially contant current supply is provided over the voltage range. -10-

434545

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