Intrinsically safe matrix keypad having opto-couplers associated

Details Intrinsically safe matrix keypad having opto-couplers associated Intrinsically safe matrix keypad having opto-couplers associated

1987-07-29

1988-10-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

340365P, 250229, G02B 2700

Patent

active

047773758

ABSTRACT:
A matrix keypad is rendered intrinsically safe by use of a circuit employing a plurality of opto-couplers powered by a single intrinsically safe (IS) barrier.

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patent: 4442425 (1984-04-01), Eiber
patent: 4481423 (1984-11-01), Conway
patent: 4495421 (1985-01-01), Endo et al.
patent: 4639727 (1987-01-01), Blasius et al.

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