Inductive amplifier having automatic gain control for butt set

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set

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379 1, 379 2, 379 22, 379 26, 379 27, 379 29, 324133, 324145, 324538, 324562, 324555, 324556, H04M 124, H04M 308, G01R 1914, H01H 3102

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055747698

ABSTRACT:
An inductive amplifier for identifying and tracing wires includes an automatic gain control feature for sensing the connection of butt set leads to the inductive amplifier and reducing the gain of the inductive amplifier in such instances to reduce the likelihood of instability or oscillations. The inductive amplifier includes a probe for sensing an input signal which is filtered and amplified for driving either an internal speaker or a speaker in the earpiece of an external butt set. The inductive amplifier includes circuitry for sensing that the leads of the butt set have been connected to the inductive amplifier, and for reducing the gain of the inductive amplifier by a factor of ten under such circumstances.

REFERENCES:
patent: 4670709 (1987-06-01), Iredale
patent: 4724382 (1988-02-01), Schauerte
patent: 4779052 (1988-10-01), Levy
patent: 4843620 (1989-06-01), Hagedorn
patent: 5025466 (1991-06-01), Hilligoss
patent: 5157708 (1992-10-01), Garthwaite
patent: 5170429 (1992-12-01), Stocklin
patent: 5193108 (1993-03-01), Stocklin
patent: 5319306 (1994-06-01), Schuyler
One page, two-sided brochure by Chesilvale Electronics Ltd. Corp. of Plant City, Florida, bearing 1991 copyright notice, and entitled "New Testing Technology, PTS Pair Tracing System, A Faster, One Handed Tracking Method".
One page, two-sided brochure by Chesilvale Electronics Ltd. Corp. of Plant City, Florida, bearing Sep. 1991 printing date code, and entitled "PTS Pair Tracing System, Pocket-Size Pair Tracing".
Three-page technical specifications by Chesilvale Electronics Ltd. Corp. of Plant City, Florida, bearing 1991 copyright notice, and bearing designation "Section CE-82-100, Issue 1, Oct. 15, 1991, PTS--Pair Tracing System, Technical Practice".
Progressive Electronics, Inc. Catalog dated Jul. 1992.

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