Ohmically isolated input circuit

Details Ohmically isolated input circuit Ohmically isolated input circuit

1986-07-25

1988-10-18

Wan, Gene

Amplifiers

Input networks

Transformer coupled

330190, H03F 300

Patent

active

047790580

ABSTRACT:
An ohmically isolated 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 gain regardless of which of the three pin connector standards are used. The input circuit includes two magnetically isolated, serially connected transformers and three input terminals connected to the transformer's serially connected primary windings so that the input signal to any two of the three terminals is transformer coupled without change in gain to the circuit output through one or the other or both of the transformers depending on which two input terminals are selected. By using current transformers rather than voltage transformers the transformers run at very low signal levels thereby permitting the use of inexpensive and lightweight transformers without the introduction of distortion.

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