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

1976-02-02

1978-07-11

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Plural power supplies

Plural load devices

315171, 315313, 340324R, 315169TV, H05B 3700

Patent

active

041004604

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: 3493812 (1970-02-01), Weimer
patent: 3701123 (1972-10-01), Barrett et al.
patent: 3997813 (1976-12-01), Chan et al.

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