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 circuit allows the "recovery" of weak signals recorded on tape that correspond to programs. The...
This circuit uses two JFET such as the BF244 or BF245 and has an excellent gain with small...
This simple motor control for alternating current with triac was obtained in a European...