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.
We found this balanced modulator circuit for DSB and possibly SSB transmissions in US 1980s...
September 2016 - It can be purchased from Mouser Electronics the new rectification controllers...
This high input impedance circuit was found in a Popular Electronics of the 90s. The circuit...