Found in a 1968 American documentation, this circuit uses an operational amplifier that is uncommon today. The feed must be symmetrical. The gain is 40 dB.
This circuit appears elsewhere in this section and on this site. The circuit generates a linear...
The circuit shown has the advantage over the reductions with resistors to have a much higher...
This circuit was found in a 90s Popular Electronics. Both the coupler and the MOSFET can be of any...