With the capacitor used, this circuit provides delays of 40 to 60 seconds. Larger capacitors can be used, and the SCR supports an equivalent. The circuit is from the 1977 RC semiconductor manual.
This circuit is from an American 1964 documentation. Transistors of the time are used, but modern...
This circuit simulates lightning using a small white lux type fluorescent lamp. The circuit is...
This circuit was found in an American transistor book from the 50's. The indicated transistors are germanium...