Protective circuit

Details Protective circuit Protective circuit

1975-01-27

1976-12-07

Miller, J D

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330207P, 317 33R, H02H 720

Patent

active

039964973

ABSTRACT:
A protective circuit effective for use with an output capacitor less type transistor amplifier includes a load impedance detecting circuit and a detecting circuit for detecting an undesirable DC voltage applied to a load. The load impedance detecting circuit comprises first and second DC bridge circuits for detecting a load impedance, and the DC voltage detecting circuit comprises third and fourth DC bridge circuits. Both the load and amplifier are protected by outputs from the first through fourth bridge circuits so as to be free from a load-shorted state and an undesirable DC voltage.

REFERENCES:
patent: 3026469 (1962-03-01), Wilbur et al.
patent: 3048718 (1962-08-01), Starzec et al.
patent: 3449680 (1969-06-01), Schilb et al.
patent: 3500074 (1970-03-01), Obenhaus
patent: 3522480 (1970-08-01), Routh et al.
patent: 3536958 (1970-10-01), Sondermeyer
patent: 3644783 (1972-02-01), Snyder
patent: 3659218 (1972-04-01), Haneda
patent: 3681659 (1972-08-01), Suzuki
patent: 3691427 (1972-09-01), Honda et al.
patent: 3731153 (1973-05-01), Nishimoto
patent: 3814988 (1974-06-01), Ito
patent: 3835412 (1974-09-01), Honda et al.

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