One chip direct drive and keyboard sensing arrangement for light

Details One chip direct drive and keyboard sensing arrangement for light One chip direct drive and keyboard sensing arrangement for light

1977-08-03

1980-09-23

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307251, H03K 508

Patent

active

042245320

ABSTRACT:
A circuit having two modes of operation for driving either one of a light emitting diode or a gas discharge tube (digitron) display from a single semiconductor chip. Respective voltages are supplied to the chip to enable the circuit to selectively operate in either of the light emitting diode or digitron modes.

REFERENCES:
patent: 3428832 (1969-02-01), Abbott, Jr.
patent: 3715764 (1973-02-01), Hatano
patent: 3925690 (1975-12-01), Spence
patent: 3950743 (1976-04-01), Hatano et al.
patent: 3990070 (1976-11-01), Spence
patent: 4070664 (1978-01-01), Abe

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