This power supply was designed for my friend, who needed a cheap high voltage PSU for his nixie tube clock.
Nixie PSU
Input voltage is in the range of 9V to about 20V but I used a 12V power supply. The output is adjustable from 140V to over 200V, with the maximum continous current about 20mA, which depends on the exact parts used (I used a different MOSFET and diode that I already had). It has been tested with IN-12B and IN-1 tubes so far and seems to work flawlessly. You can find all the project files on my github: github project
Schematic
The schematic and PCB were both designed using KiCAD 6.0
PCB design
Parts used
- 220uF 16V electrolityc capacitor
- 300mOhm shunt resistor
- 1nF ceramic capacitor
- 330uH inductor
- 1kOhm, 470kOhm resistors
- generic fast switching diode and PNP transitor (1N914,BC557 on the schematic)
- IRF740 - power mosfet (you can try different ones to see which works best for you)
- 1N4004 diode
- 5k potentiometer
- 1uF capacitor for feedback filtering
- 4.7uF 400V output capacitor
- MC34063A dc/dc converter ic
- 2x connector
Assembled project
Author
Krzysztof Sikora
Cracow, 02.2023