Found in a 1969 documentation, this neon lamp circuit may have the number of steps increased. The power supply is made with high voltage.
With the coded activation of the relays, it is possible to control which of the 16 outputs...
The integrated circuit used in this application is not very common. Transistors and resistors...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...