I would like to present some of my previous project. I have founded a group of people with the same idea as me. We have created a nixie clock together.
Of course, there is a lot of similar products. From the easiest one to most complicated (some of them was used as inspiration ;) ). So what is the difference ?
- MCU controlling
- non-multiplex nixie driving
- custom housing
System consists from 2 PCB, controlling(MCU+converter) and controlled (nixies+glows). Time is showing on IN-12A nixies. All nixies are connected to direct voltage 200V@3mA. This voltage is converted via DC/DC converter MC34063 from 12V. Two indication glows lamps have the same power system (90V@0.5mA). Converter is working in two modes day/night. Voltage is being changed by reference voltage over resistor ratio. Transistor connects one resistor's pin to ground. This mechanism is driven by control board over lighting intensity.