This flasher circuit consists of an astable multivibrator with the frequencies given by the capacitors. The circuit is from 1965 using light bulbs, but LEDs can be used. Power comes from 4 batteries.
This sensitive electroscope uses a MOSFET 3N128 and can detect electrostatic charges of objects....
This circuit was found in a 1968s European documentation. It is a current regulator using...
This small telegraph transmitter has a range of a few meters, operating at a frequency that...