Off-hook Telephone Indicator (CB5994E)

This circuit was found in a 1980s US publication. It indicates when the phone is off-hook by triggering an indicator.

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RF Mixer (CB5351E)
This FET mixer in a common source configuration was found in a 1980s documentation. The circuit...
TC35670 and TC35675 Bluetooth Controllers (COM141E)
November 2016 - Mouser Electronics has in stock the Toshiba Bluetooth TC35670 and 35675...
Operational Amplifier with FET (CB3943E)
We can obtain the characteristics of an operational amplifier with FET by adding FETs common to the...