Simply place the tool or object you want to magnetize inside the coil and briefly press S1. The generated single polarity field should magnetize the object if the material it is made to allow.
When the input voltage is higher than 2/3 of the power supply voltage the green LEDs glows. When...
This circuit was found in the December 1971 issue of Radio Electronics magazine. The circuit is...
The circuit of a 1968 publication can be implemented with more modern transistors such as BC548 for...