This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit is powered by only 3 V and can be used for signaling.
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...