Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-06-04
1995-10-10
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340635, 324 66, 324538, G08B 2100
Patent
active
054574412
ABSTRACT:
An inductive amplifier for identifying and tracing wires is provided with a pair of threaded post terminals for being engaged by the electrical clips of a jumper wire or telecommunications butt set. The inductive amplifier includes a built-in speaker and a depressible power switch for applying power from a battery to a tone amplifier. A switching transistor couples the battery to the tone amplifier whenever a low impedance path is formed between the pair of threaded post terminals, even if the power switch is not depressed. The built-in speaker is connected in series with the threaded post terminals and is a.c. coupled to the tone amplifier for sounding the tone through either the built-in speaker or through a butt set engaged with the threaded post terminals. The impedance of the built-in speaker is selected to be less than that of the butt set for silencing the built-in speaker when the butt set is connected.
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Lefkowitz Edward
Peng John K.
Progressive Electronics, Inc.
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