This high-power flasher for incandescent signaling lamps was found in a 1980s General Electric documentation. The circuit has a photoelectric control and is powered by the 110V grid.
Found in 1965 Radio Shack documentation, this circuit has a crystal phone output in the 14.8 kHz...
In the figure we have a simple shield of 1 transistor. The supply voltage depends on the relay. The...
This circuit was found in an old documentation, being able to generate signals of frequencies in...