Amplifiers – Input networks – Transformer coupled
Patent
1988-10-17
1990-11-06
Mottola, Steven
Amplifiers
Input networks
Transformer coupled
330190, H03F 300
Patent
active
049689495
ABSTRACT:
An ohmically isolating input circuit accepts a three pin connector of a cable from a signal source output for virtually all three pin connector standards, and will output a signal of the same voltage regardless of which of the three pin connector standards are used. In one embodiment of the invention, the input circuit includes a center tapped transformer having its tap primary winding side connected to the circuits three input terminals and having its secondary winding side connected directly into the input of an operational amplifier which forces the transformer to operate as a current transformer with virtually no voltage drop across its secondary or primary windings. The output of the operational amplifier, which serves as the output of the input circuit, is fed back to the inverting input of the operational amplifier to provide a high gain negative feedback circuit which converts signal currents from the transformer secondary winding to an output voltage signal. The output voltage signal will be substantially the same regardless of which input terminal pair receives the input voltage, and regardless of whether the unused input terminal is connected to the common terminal.
REFERENCES:
patent: 4270061 (1981-05-01), Gronner et al.
patent: 4779058 (1988-10-01), Meyer
Hemsath Bill
Meyer John D.
Seidel Felicity
Torrano Michael A.
Beeson Donald L.
Meyer Sound Laboratories Incorporated
Mottola Steven
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