We found this circuit in a 1994 National Semiconductor technical documentation. The circuit can be adapted to operate with more modern equivalent operational amplifiers.
Found in a 1964 Electronic Design, this circuit must use transistors according to the supplied...
This circuit powered by photovoltaic cells was found in the November 1998 issue of Electronics Now magazine....
This low impedance microphone preamp uses an operational amplifier with FET. The power supply must...