Teletypewriter line keyer with switching current regulator
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United States of America Patent
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Oct 19, 1982
Issued Date -
N/A
app pub date -
Jun 1, 1979
filing date -
May 25, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A teletypewriter line keyer with a switching current regulator responsive to a floating, loop current powered voltage comparator used as a loop current monitor. The line keyer, which may have positive and negative line current keying, uses a single current monitor to control positive and negative current regulators responsive to the positive and negative keying respectively. The switching regulators operate within a relatively narrow band centered around the nominal signaling current, with filtering being provided for ripple control. The circuit may also include a keying detector and open loop detector for system monitoring.
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