This circuit was found in a 1980s US publication. It indicates when the phone is off-hook by triggering an indicator.
This FET mixer in a common source configuration was found in a 1980s documentation. The circuit...
November 2016 - Mouser Electronics has in stock the Toshiba Bluetooth TC35670 and 35675...
We can obtain the characteristics of an operational amplifier with FET by adding FETs common to the...