We found this circuit in a 1977 National Semiconductor Databook. The circuit can use other FETs like the BF245 and has an input impedance of 10 megohms. The circuit gain is unitary.
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
The input resistance of this circuit is 60k and the pass band from 20 to 20kHz. The circuit is...
This circuit was proposed by an old American documentation for listening to SSB stations. The...