This amplifier with two FETs in direct coupling (cascode) was found in a 90s Popular Electronics. The MOSFET can be of almost any type like the MPF102.
Schmitt Triggers convert a signal of any waveshape in square signals or pulses. The circuit shown...
This is the conventional application of the UCN4202 to control a 12 V stepper motor with current...
This oscillating circuit that can be used as a VHF transmitter was found in a 1990s spy book. The...