This trimmer or reaper amplifier cuts the signal peaks at a voltage determined by the zener diodes. The gain is given by R1 and R1 and the power supply must be symmetrical from 5 to 15 V.
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...