This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are common neon and the circuit indicates whether the voltage is 110 V or 220 V.
This General Electric circuit is from the 80's. The PUTs used in this meter are not common...
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...
Found in 1965 General Electric documentation this circuit applies to a LASCR used as an optical...