You'll have to set up the XC18's so that only one can be ignited at any moment in your circuit to prevent excess current flowing in the anode resistor, this will be automatically done if you put two of them in parallel in the place of an XC24 in the circuit in the Dance book. The left XC18 (of the pair) which is ignited at power on will be extinguished when the #1 XC18 is ignited, and so it will cycle onwards until #9 is ignited which in turn will bias the right XC18 (of the pair) so that the count starts over at #0. I can fully understand that you want XC24's but for testing the circuit two XC18's works just fine. I've tested it without any problems at all, and also built coupling stages that are self extingushing so that they are not part of the counting ring. /Martin
On Saturday, June 22, 2013 7:40:28 PM UTC+2, Nick wrote: > I had come across the use of paralleled XC18s and experimented a bit - I > discussed it with Grahame Marsh some years back when he was doing his > trigger clock - I'd still like some *real* XC24s though - paired XC18s > don't behave terribly reliably (current obviously doubles when second tube > fires)... > > There are a lot of XC18, XC24 & Z700U etc. circuits in the standard texts > (Dance, Bylander etc.). > > Nick > > On Monday, 17 June 2013 11:58:22 UTC+1, Dekatron42 wrote: >> >> Nick, are you aware of the fact that you can use two XC18's wired in >> parallel with their anodes and cathodes tied together and with the trigger >> electrodes separate to emulate an XC24? >> >> This trick was shown in old magazines as a way to only use the XC18's in >> counters where a reset capability was wanted much like when an XC24 was >> used. There are some other nifty ways of hooking the XC18's up shown in old >> magazines to build logic gates and such as well as decade counters using >> fewer than ten XC18's used for frequency division. >> >> /Martin >> >> Den måndagen den 17:e juni 2013 kl. 09:57:43 UTC+2 skrev Nick: >> >>> I'm still hunting for XC24s... >>> >>> Got loads of XC18s for a clock project, but not found any 24s... >>> >>> Nick >>> >>> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/f4e9b28b-6d42-4852-a567-024794f76071%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
