Circuit arrangement for electronically generating a resistor set

Details Circuit arrangement for electronically generating a resistor set Circuit arrangement for electronically generating a resistor set

1986-02-04

1988-03-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

047301147

ABSTRACT:
A circuit arrangement for causing a resistor to assume a selectable value in which the resistor is photosensitive and optically isolated from the control circuitry used to drive a photodiode and so to generate the light which determines its resistance. The control circuitry includes a second photosensitive resistor arranged in a feedback loop and further arranged to be illuminated by a second photodiode in parallel with the first photodiode. The resistance value is selected by supplying the control circuit with an analog voltage signal which may be developed at the tap of a potentiometer either directly, or indirectly after conversion to a digital signal, storage, and eventual reconversion into an analog signal.

REFERENCES:
patent: 3772514 (1973-11-01), Sunderland
patent: 4056719 (1977-11-01), Waaben
patent: 4228323 (1980-10-01), Feiner et al.
patent: 4313225 (1982-01-01), Carbrey et al.

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