This 555-based circuit was obtained from the 1995 Encyclopedia of Electronic Circuits volume 5. It triggers an SCR when the transistor is cut off.
This power source was found in a 1968 Electronics World. The transistors are from that time. The...
This circuit was found in a 1986 documentation. The circuit uses 12 V relays and is powered by a...
This circuit amplifies VHF signals in the two-meter range and is very critical, especially...