The integrated circuit used in this circuit from a 1987 documentation is no longer common today. This circuit can generate a multitude of different sounds and this circuit is an example of application.
This amplifier was taken from documentation from the 1960s. Transistors are germanium types from...
Simply place the tool or object you want to magnetize inside the coil and briefly press S1. The...
This circuit is old, from an English publication from 1979, so the indicated sensor is no longer...