Coin relay drive and switching circuit for paystation telephone instruments
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United States of America Patent
Stats
-
Jan 12, 1988
Grant Date -
N/A
app pub date -
Dec 13, 1985
filing date -
Dec 13, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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