Nixie Tube HV Driver

Part List
NE555N Timer IC & Socket (8pin IC)
2.2nF Film Cap.
100pF/250V Film Cap.
BC547 Transistor
470µF/16V Electrolytic Capacitors
1K 1/4W Resistor
10K 1/4W Resistor
2K2 1/4W Resistor
220K 1/4W Resistor
1K Trimmer
4.7µF/200V E-Cap.
IRF740 Mosfet
100µH/3A Radial Inductor

Comments

[zacnotes]

Signal, thanks for posting the design. I have a troubleshooting question:
I have built a supply based on the build from:
http://www.ledsales.com.au/kits/nixie_supply.pdf
and it was giving me troubles, so i searched and found yours, which is very similar. The voltage is much more stable on your build, but still not high enough. (i am maxing at about 105v).
I am using a ceramic 100uh inductor, could that be causing me issues?

[mstfldmr]

how do you select which number to power?
how many nixie tubes can you drive with this circuit?

[signalelektronik]

You can supply 50mA

[gmoon]

What are it's current capabilities?