> I'd use the more traditional design with a resistor in series with the base > of the NPN transistor driven by the CPU, rather than the emitter resistor as > you showed.
David has a point - the disadvantage is it uses one more resistor, the (large) advantage is the functions are now separated - R7 limits the current out of the microcontroller pin into the base of T2, and R6 limits the current through T2 into the base of T1. Since they're separate, they can be different values (as, in fact, they are). You might have to tweak R6 a bit lower, since the supply voltage will be less for VFD use (R7 is fine). - 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/71D973B2-2B82-4568-BC33-FE5331DAF359%40mac.com. For more options, visit https://groups.google.com/groups/opt_out.
