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 crystal tester was found on a 90s Ham Radio. Transistors are commonly used. The circuit is for...
This 3V-only circuit was found in old American documentation, but can be implemented with...
The figure shows how to implement an inverter amplifier with a Norton operational amplifier. The...