Coin relay drive and switching circuit for paystation telephone

Details Coin relay drive and switching circuit for paystation telephone Coin relay drive and switching circuit for paystation telephone

1985-12-13

1988-01-12

Rubinson, Gene Z.

Telephonic communications

With check operated control

At terminal station

379132, 379150, H04M 100

Patent

active

047196483

ABSTRACT:
A telephone paystation coin refund and collect circuit for operating a coin relay with power obtained from a two-wire business telephone line. The circuit employed utilizes charge storage capacitors and MOS-FET transistors for current pulsing of the relay coil with current flow in either direction as determined by a signal from an associated microprocessor controller.

REFERENCES:
patent: 4198545 (1980-04-01), Haist et al.
patent: 4361731 (1982-11-01), Smoot

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