With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with the circuit shown in the figure. The circuit is from a 1965 Electronic Design.
Found in documentation from the 90s, this circuit can employ other comparators in the series such as...
This circuit was found in a PE Hobbyst Handbook from 1992. The second oscillator is a VFO. The...
This motor control using transistors was found in a recent English publication. The circuit is for...