John, I would have top go back and play with it once again (this is where better note keeping on my part would've paid off) to be sure, but what I remember is that I would get fluctuations and noise on the signal feeding the stages and with the simple 1 transistor circuit, the rings were getting triggered. These signals would stay high for up to 10 mins depending on the ring. I put in the extra stage to make the actual trigger for the ring a short pulse. This made it significantly less prone to fire on signal variations. It may be a tad bit overkill but I have found it to be reliable.
-joe On Tuesday 09 August 2011 14:34:38 Quixotic Nixotic wrote: > On 9 Aug 2011, at 12:30, Joe Croft wrote: > > Thank you! I really had to swallow hard to put the processor on the > > clock, but > > it was needed. It also added a little eye candy with the quarter > > hour marker > > lamps as well as being able to add in a rtc so that it could > > survive power > > interruptions. > > Joe, > > Can you explain why you needed to have a three transistor stage > trigger between the later stages - it seems like overkill. Was it > really necessary to condition the signal between rings in this way? > If so, why? > > John S -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
