The circuit shown has a voltage gain of 500 times and can use equivalent FETs like the BF245. The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook.
This traditionally configured power supply provides +12, -12 V and 5 V voltages for operating and...
This simple circuit for headphones or small speakers was found in documentation from the 90s. The...
The operational amplifier used is not common today, but the circuit can be implemented with modern...