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.
This is the traditional configuration for a limit comparator or window comparator, using two...
We found this circuit in an English publication. The transistor can be BC549, and the power supply...
This simple preamplifier with two transistors may be used in a wide range of applications. The...