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.
June 2017 - Microchip's new PIC18LF67K40 8-bit microcontrollers with Flash / EE / RAM memory and...
Found in old documentation, this circuit applies to almost any common operational amplifier or...
The simple two-transistor signal injector shown in the figure was found in the May 1971 issue of...