Constant current source for field contact input

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

1982-08-16

1985-07-30

Shoop, William M.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

307297, G05F 308

Patent

active

045324662

ABSTRACT:
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 constant current supply is provided over the voltage range.

REFERENCES:
patent: 4025850 (1977-05-01), Spiteri
patent: 4283674 (1981-08-01), Kominami et al.

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