Coulometrically timed indicator lamp circuits operable from high

Details Coulometrically timed indicator lamp circuits operable from high Coulometrically timed indicator lamp circuits operable from high

1975-02-10

1976-08-10

Caldwell, John W.

Communications: electrical

Systems

Timer control

324182, 317230, 307310, G08B 100, G04F 800, G04F 1000

Patent

active

039744957

ABSTRACT:
A three terminal coulometric timer cell is provided having two terminals available to detect continuity of an anode filament that is ruptured after a predetermined time period by plating away upon a cathode cup-like container. Connected across said two terminals is a light emitting diode to visually indicate the end of the time period. Simplified circuit configurations requiring only the cell, two resistors and the light emitting diode are provided with variations permitting AC -- DC operation, reliable high voltage operation, low operating power and temperature stable operation.

REFERENCES:
patent: 3192405 (1965-06-01), Patchell
patent: 3355731 (1967-11-01), Jones

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