This experimental circuit with Nixie tube was found in the Radio Electronics magazine of March 1969. The circuit serves for demonstrations and also for testing these digital indicator tubes.
This circuit is from an old American documentation from the 70s. Transistor 2N3904 can be replaced by...
The circuit shown shows the water level in a reservoir, showing them by turning on LEDs. With LED4...
We found this circuit in a technical documentation from the 70s. It can be implemented with more...