> > Yes, I agree with Tomasz, the first circuit shown in the article he links > to is the way to do it. Advantages: No "wasted" current draw, cheap and > easy. Ignore the comments in that article about the problems of voltage > drop - that might be important when you've only got 5V to play with, but > with 200V on tap... !! >
Suggest RSense of 120 Ohms should regulate the current to 5mA, then make R1 anywhere between 100K and 220K. Not critical. Use a high voltage MPSA42 transistor or similar for T1, T2 can be any old jelly bean type. While this constant current source will be inherrently short-circuit proof (the most current that will ever flow will be 5mA), be aware that under those conditions a humble MPSA42 will be dropping 1 Watt and will fry pretty quickly! Something a little beefier in the power stakes might then be a better choise. -- 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/a9018ffa-cc32-439e-8a11-5d7a549310c7%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
