High impedance transducer circuit

Details High impedance transducer circuit High impedance transducer circuit

1980-01-14

1981-12-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

328162, H01J 4014

Patent

active

043061460

ABSTRACT:
Electrical monitoring and/or control circuit including a high impedance transducer--for example a photo-diode--which is situated remotely from a measuring circuit and linked to it by a balanced twisted pair of wires fed by a power MOSFET forming a "buffer". The arrangement is such that equal pulses of opposite phase are induced in the twin feeder when a pulse output is produced by the transducer, which is substantially noise-immune without the use of coaxial cable and without the necessity for situating all the measuring circuitry at the transducer position. May be used in "difficult" electrical environments, e.g. where there are electric motors such as in tobacco-feeding arrangements.

REFERENCES:
patent: 3770967 (1973-11-01), Hanna et al.
patent: 3906384 (1975-09-01), Schiffman
patent: 4173723 (1979-11-01), Temes et al.

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