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.
The figure shows how to implement an overtemperature sensor with the Norton LM3900 amplifier. The...
An excellent signal generator for the audio track was found in a 1983 documentation. Its complete...
This circuit is used as a magnetic field sensor and is based on a Texas Instruments HaII Effect...