Hmm, so i ain't so smart at uploading images! try again... https://docs.google.com/leaf?id=0B3KTZNOahiFEZGY5NGJmMWUtNDE5Mi00NTgzLWI1NWQtMmMxZDQ3MTg3ZmUy&sort=name&layout=list&num=50
(but basically, it is a very similar idea to David Forbes Anode drivers). LW On Feb 6, 5:39 pm, will <ossumguyw...@gmail.com> wrote: > Also, as for current leakage, remember that my DMM literally shows > like 6mV from anode to ground when the anode is "off", but then for > some reason whenever the "7" on the other tube lights up, the anode > voltage shoots up, and the same thing happens to a smaller extent with > the decimal points. > > On Feb 6, 11:15 am, will <ossumguyw...@gmail.com> wrote: > > > Hey MrNixie, I can't seem to access your link. > > And indeed, now is a time when I find myself wishing for a good scope. > > I'm trying to contact a guy on craigslist right now for one. > > I was able to switch my MOSFET pretty well with a totem-pole assembly > > (two 100 ohm resistors connected to PNP and NPN transistors, both > > joined at the emitters and connected directly to the gate of the > > MOSFET). So yes, two resistors and two transistors, but I've already > > gone and used them. BTW, I'm actually using an IRF730 in my circuit, I > > saved the IRF740 in case I needed to switch a bigger load. > > > On Feb 6, 5:40 am, "MrNixie (UK)" <laurence.wilk...@dsl.pipex.com> > > wrote: > > > > Will, This is the point (in case you hadn't noticed!) when a 'scope > > > comes in real handy! You really want to pursue that - I use mine a lot > > > for fault finding my designs! It will pay for itself in your time, > > > Teach you loads and reduce frustrations. > > > > I think your issue is not an AC (i.e. transistors not switching off in > > > time) issue, but a DC (leakage currents) one. I might suggest a > > > different arrangement for your anode drivers, tho. > > > > This is my own tried and tested arrangement: > > > >https://docs.google.com/leaf?id=0B3KTZNOahiFEZGY5NGJmMWUtNDE5Mi00NTgz... > > > > (i hope you can see that?) > > > > Also, I can save you at least two resistors and two transistors in > > > your HT power supply. Junk that crappy old chestnut of a FET IRF740 > > > (pah!) and get a decent low Vgs one from the likes of Toshiba 2SK3562, > > > to name but one. These switch cleanly with a gate voltage of 5V, > > > supplied STRAIGHT from your controller IC. > > > > Laurence -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
