I was typing the previous reply while you posted it, that clears some things up.
You mention tweaking the value, is there a way to actually calculate it? (I'm not that much into transistor calculations as you may have noticed) Op dinsdag 19 november 2013 22:06:16 UTC+1 schreef jrehwin: > > > 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/22dc8faf-3472-4492-ab68-6fddc738a31d%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
