Isolated two-wire transmitter

Details Isolated two-wire transmitter Isolated two-wire transmitter

1975-06-03

1976-05-25

Goldberg, Gerald

Communications: electrical

Systems

Call station

321 2, 340186, G08C 1902

Patent

active

039597865

ABSTRACT:
An isolated two-wire transmitter includes a regulated d.c. power supply having an astable multivibrator which generates isolated power supplies and input terminals which are connected to a first operational amplifier to thereby control a transistor in order to produce a current proportional to the input voltage. That proportional current controls the output of a current transformer, which chops that current at a rate determined by the multivibrator. The a.c. current from the current transformer is rectified and controls a second operational amplifier and a Darlington circuit to thereby produce an isolated current proportional to the input voltage.

REFERENCES:
patent: 3387266 (1968-06-01), Swartwout et al.
patent: 3560948 (1971-02-01), Inose et al.
patent: 3757195 (1973-09-01), Sklarouf
patent: R27596 (1973-03-01), Hurd
IBM Tech. Disc. Bulletin, Vol. 13, No. 8, Jan. 1971, pp. 2255-2256, "Remotely Powered Measurement Systems," By E. R. Barr.

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