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 small audio amplifier is based on the LM390 with a minimum of external components. We found it...
This circuit was obtained from Elektor magazine and published in the Encyclopedia of Electronic Circuits...
We found this configuration in National Semiconductor's Linear applications Handbook. The circuit...