This Nixie pipe circuit was found in 1965 documentation. Note the high supply voltage. Appropriate transistors of the time were used.
Found in a 1967 publication by General Electric, this SCR circuit generates voltages of 120 VAC at...
I found this simple circuit an English magazine from 1984. The circuit can be easily assembled by simply...
This circuit also detects IR, providing LED indication. The circuit is used to indicate humidity in...