Found in an old publication about neon lamps this circuit works directly connected to the power grid, serving as an indicator for various situations. Ordinary neon lamps can be used.
With the name of transitube we find this MW receiver in documentation from the 50's. It uses a...
This circuit can provide both positive and negative voltage outputs from 2 to 12 V with current up to...
In critical applications of the RS-232 interface, the danger of induced voltages in the cables must...