This circuit is from a 1968 documentation. It generates a non-symmetrical signal with the waveform shown next to the diagram. Transistors are of the time, but modern equivalents can be used.
This is the basic configuration of a voltage comparator with the Norton LM3900 amplifier. The...
Found in Motorola documentation from the 90s, this circuit makes use of a triac from that time. The...
In a September 1992 Radio Electronics article, we found this basic 555 circuit used to generate fixed...