Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

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Isolated control (CB9274E)
The 1: 1 transformer on this circuit found in a 1967 Electronics World can be wrapped around a...
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This simple stage can operate with low frequency signals (audio), driving a small lodspeaker....
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This circuit has a gain of 6 and a Q factor of 8.63. Operational amplifiers are common, like the...