This countdown electromagnetic ring launcher was found in an Electronic Hobbyst Handbook from 1993. The components can be difficult to obtain. Details of the launch coil were not given.
This 25 W phase photo control was found in a 1965 General Electric publication. The circuit uses a...
The circuit below uses common JFET transistors, which can be the BF245 or MPF102 amplifying video...
This circuit was found in a 1997 documentation. It works as a booster for VHF and UHF signals...