HP nixie tube module information needed (fwd)

I asked my partner, and here's what he came up with about them. Hope it helps. ---------- Forwarded message ---------- Date: Tue, 20 May 2003 16:41:52 -0500 From: Chris Radek <chris(a)timeguy.com> To: Bill Richman <bill(a)timeguy.com> Subject: Re: HP nixie tube module information needed (fwd) On Tue, May 20, 2003 at 04:24:22PM -0500, Bill Richman wrote: All I know is they were used in counters. These have a binary to 1-of-10 decoder made out of photoresistors and neon bulbs (!) in the black box. It's not a HV supply like he guessed. It should be possible to make a clock but he'll have to modify some of them to reset before the usual cycle of 0-9. Resetting at 23:59:59 is probably harder and would take some kind of external logic. They already have a feedback to make them reset after 9 instead of counting to 15 - it just has to be modified. On the other hand if he wants to make a clock, nixies are cheap and it might be better to just leave the counter modules as-is and use some logic more suited to counting the time (which is not 10-based). I'm sorry I don't have a schematic. It should be easy to trace out - it's just four flip-flops and a feedback line for reset.