Found in the 1974 Ferranti transistor manual, this Schmitt trigger circuit uses general-purpose transistors of the time.
We found this circuit in Texas Instruments documentation from 1986. The circuit produces a...
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be...