Found in a 1991 PE Hobbyst Handbook, this circuit activates an oscillator that deactivates at the end of the programmed time. Transistors are commonly used.
This filter, found in an old manual, has characteristics of reduced overvoltage given by the graph...
This circuit is from an American publication from the 60's. The power is on the order of 600 mW....
One 40108 Schmitt inverter or one 4093 gate can be used as a half monostable to be triggered by...