If you suspect line-noise, plug a noisy device into the socket next to the suspect clock and turn it on/off rapidly for a few minutes to see if the clock gains time. If your clock is susceptible to line-noise, it will gain time. I found that my Weller WTCPN soldering station is REALLY noisy; far more noise than my circular saw or garage vac.
My first-generation nixie-tube clocks use the 60Hz line signal for keeping time. I have 2 stages of low-pass filtering. The first-stage is for high-frequency/high-energy noise on the AC line, right where the AC line comes onto the PC board. The second-stage is a simple RC filter for the 60Hz reference signal to the CMOS counters with a cutoff frequency around 300Hz. Incidentally, my clock uses 4000-series CMOS gates, running at 10VDC. It has no transformer, and the "ground" of the clock is tied directly to the AC line. Yes, it's perfectly safe to run a CMOS gate tied directly to the AC line; no worries of surges, ESD, noise, etc because the other side of the AC line is well-protected and filtered. -- 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/9ad0c8bb-ca4c-4f85-9d57-78b31f67a166%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
