Found in 90s Radio Electronics, this circuit is intended for amplifying analog video signals. Integrated circuits are uncommon today and the bandwidth is 100 MHz.
The figure shows the basic circuit of a relaxation oscillator with operational amplifier. The...
This circuit triggers a warning oscillator if you forget the lights on when you leave the car. The...
The circuit below shows how to use an LM139 comparator or series equivalent as an amplifier. The...