Firing circuit for card reader device

Details Firing circuit for card reader device Firing circuit for card reader device

1980-09-17

1982-11-16

Yusko, Donald J.

Registers

Coded record sensors

Particular sensor structure

346162, G06K 706

Patent

active

043596320

ABSTRACT:
A firing circuit for selectively energizing opposed portions of a spark gap card reader. The circuit includes a source of alternating current which is first rectified by a diode and then used to charge a storage capacitor. The capacitor is discharged through a transformer to energize the card reader with a high voltage thereby enabling the reader to sense patterns on a card in the reader. The capacitor is discharged under control of a silicon controlled rectifier whose gate input is fired by activating a switch. Each time the SCR is rendered conductive it is again deactivated, i.e. rendered non-conductive by a slightly negative back biasing to the diode used to half wave rectify the alternating current source.

REFERENCES:
patent: 3218647 (1965-11-01), Fenner
patent: 3562496 (1971-02-01), Fisher
patent: 3781163 (1973-12-01), Ovens
patent: 3835301 (1974-09-01), Barney

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