Luca is building a Nixie clock, and in this post he covers the high voltage power supply section.
Nixie tubes are digit displays that use ~170V between the digit wire and a wire mash, to agitate the gas inside the tube. This surrounds the digit wire with a orange glow and it becomes visible through the tube.
Luca is using the MAX1771 based DC/DC boost converter to supply the high voltage required. This DC/DC steps up the 9-12V input to 180V output, as a bonus it has an additional 5V output for the rest of the circuit board.
New post about my nixie clock project, this one about driving nixies:
http://www.lucadentella.it/2011/12/08/orologio-nixie-2-il-driver/
Hi…
I need to generate 100v, 30mA to 40mAin max1771 …I got only the 50 to 60% of output only
while i’m connecting the load 1k to 10K V& I goes to low ….. plz help me to
I need 100v @40mA and 1k to 10k constant current @ the load
MAX1771 uses an external switch, inductor, diode. Tell us what MOSFET, inductor, diode you used. And by that I mean not only the rated values, but the parts, packaging, etc. If you don’t select the right parts to meet your performance target, switching supplies won’t work well.