OK, take a look near the bottom of sites.google.com/site/willyager/ nixie-clock to see pictures of the top and bottom of the anode controller, maybe it will help.
On Feb 6, 12:41 pm, David Forbes <[email protected]> wrote: > On 2/6/11 11:25 AM, will wrote: > > > Hey, > > I just tested M.J.'s anode driver, with no luck. Performance is the > > same. Also, the reason I don't need a resistor between MPSA92 and > > MPSA42 is because (according to Jason Harper) the resistor between > > MPSA42 emitter and ground forms a constant-current driver. Check out > >http://nixietube.info/NixieTransistors.pdf, and go to the bottom of > > page seven. I am using a 10k emitter-ground resistor. Per the advice > > of this board, I replaced the 1 megohm resistor with a 10k resistor > > and per my own advice I put another 10k resistor between the MPSA42 > > and microcontroller. > > OK, I understand now. The current limit is in the emitter circuit. I > suppose that will work as well as the other - it's just a different > method. And it's true that you don't need a base resistor in that case, > since the base will be at 5V as the emitter voltage rises. > > Silly me. > > But photographs are essential, especially when the problem is "weird" as > this one is. > > -- > David Forbes, Tucson AZhttp://www.cathodecorner.com/ -- 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.
