I had this same problem when using SN75468's for digit drivers (discrete high voltage drivers) with IN-17's. These have a common pullup voltage, that I set to 100v. My problem was that the 100v would drop to a lower voltage due to using too big of a resister with the 100v zener diode.
Not sure if individual transistors need a high voltage pullup resistor for muxing. I've only used M42's for direct drive. - Michael Sangster www.coldwarcreations.com On Feb 5, 2:08 am, will <[email protected]> wrote: > On Feb 5, 12:09 am, will <[email protected]> wrote: > > >there is still some minor ghosting > > on certain digits (mostly the seven) > > Well this is interesting... I tried taking the anode control wire of > the second digit and tying it to ground. As expected, this turns all > the digits off and eliminates all ghosting... except for seven! Seven > turns off just like all the other digits, but for some reason it > continues to ghost over from the other tube. Even stranger is > this:when I measure the second digit's anode voltage compared to > ground, my DMM says zero volts (well, a few millivolts). But when the > first digit hits seven, the DMM says the anode is 25 volts relative to > ground (remember PWM is going on here, so that's probably not > accurate, but it still shows there is voltage). As far as I can see, > the wiring is exactly the same between all the digits, but seven just > keeps acting up more than the others... > > I probably have some stupid wiring mistake causing the seven thing, > but the ghosting still doesn't want to go away. -- 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.
