Found in a 1964 Electronic Design, this circuit is intended to serve as a time base for cardiac monitors. Transistors support equivalents.
This circuit with low impedance output and 900k input impedance was found in the October 1993...
This oscillator for Morse code training was found in a Popular Electronics from the 90s. The...
This is another one of the many debouncer circuits that the reader can find on this site, and it...