Teletypewriter line keyer with switching current regulator

Details Teletypewriter line keyer with switching current regulator Teletypewriter line keyer with switching current regulator

1979-06-01

1982-10-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

178 3, 323282, 323285, G05F 140, H03K 114

Patent

active

043554032

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.

REFERENCES:
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patent: 4047055 (1977-09-01), Romano
patent: 4194147 (1980-03-01), Payne
Eugene R. Hnatek, `Choose Switching Regulators`, Mar. 15, 1975 in Electronic Design, pp. 54-58.

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