This 4-tube counter was found in Radio Electronics magazine from December 1959. The circuit uses a coil as a sensor to detect the passage of metallic parts or magnets.
This circuit turns on a lamp in the dusk and turn off in the down. Only incandescent lamps can be...
This circuit is from a Linear Technology integrated circuit manual from the 1990s. The circuit...
This circuit found in Hands On Electronics only connects a load, which in this case is an LED. The...