> I hope someone out there has some thoughts on this and is willing to help out > this noob. > > The senerio is this: > > I am attempting to use an Arduino in conjunction with a TLC5940 to drive an > array of IN-9's (And not kill myself or blow anything up) the problem being > if i understand it right (which I probably don't) is that instead of a > positive PWM out the arduino the TLC5940 works by sinking the current on the > cathode side. I don't think i can use this with my standard mpsa42 (and I'm > not going to attempt anything until i get some advice) I do have some > mpsa92's available.
That's a somehat peculiar choice for driving an IN-9, but if that's the way you're going, you'll want a common-base setup for your transistor, to provide voltage gain but not current gain (the current through the IN-9 will still be controlled by the TLC5940). You could use your MPSA42 for this (note that I'm just scribbling here, this lashup might not work): http://www.vitriol.com/images/tech/nixies/TLC5940.gif Have you read Jan's writeup on driving IN-9s? http://www.die-wuestens.de/iz/IN9-2.pdf You might also want to look at some other designs used to drive IN-9s, such as Brian Stuckey's Nixietherm: http://www.tubeclockdb.com/forum/Builders-Forum/1280-Nixietherm-IN-9-bargraph-based-thermomer.html - John -- 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/255042CB-1942-46A4-9EF5-4732656B88FC%40mac.com. For more options, visit https://groups.google.com/groups/opt_out.
