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 obtained in a magazine for radio amateurs 73 of the 90s. The circuit is based on...
This input stage has unit gain but a high input impedance and low output impedance. The circuit is...
May 2016 - It can be obtained from Mouser Electronics new display 1092 from VDC. The new LED...