Electronic calculator with push-button on-off system

Details Electronic calculator with push-button on-off system Electronic calculator with push-button on-off system

1976-06-14

1978-09-19

Schaefer, Robert K.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307115, H03K 1760

Patent

active

041157052

ABSTRACT:
An electronic calculator with a power supply ON-OFF arrangement actuated by momentary-closure push-button switches which are part of the keyboard. A bistable latch circuit on the calculator chip is continuously powered by the battery, and is caused to flip to an ON condition by actuating an ON key, and this turns on a large, low-resistance transistor which is in series with the voltage supply line going to all of the other electronic circuitry on the chip.

REFERENCES:
patent: 3743860 (1973-07-01), Rossell
patent: 3831081 (1974-08-01), Weiss
patent: 3911426 (1975-10-01), Mouton
patent: 3918041 (1975-11-01), Mao
patent: 3996430 (1976-12-01), Eberwein
patent: 4005293 (1977-01-01), Boulanger
Marston, "40 Projects Using COSMOS Digital IC's" from Radio-Electronics, Oct. 1974, especially FIG. 12.

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