My version of Nixie clock by Krzkomar. This was probably my first contact with Eagle CAD.
Original project here:
Nice clock with date/time only fuction (part with the speaker is unusable). Some ICs are hard to buy (74142 TTLs, DS12887). You can use DS12885 with external battery and crystal.

There was several problems with this clock and my solution for them:
- use 2x75V Zeners instead of one 150V because of weird effects inside nixie tubes after 2-3 days of working
- replace MC34063 step-up converter to MAX1771 which has much better efficiency. No more mosfet burning!

Eagle files:
Nixie Clock MB.sch
Nixie Clock MB.brd
nixie_v002.hex from author's site