I’m out of pins on the Arduino Nano, unless I want to use shift registers. Which I really don’t as they would take up more circuit space. The Neon lamps require .7Ma and have a life expectancy of 20,000 hours AC so 12,000 hours DC, that’s longer than the IN-17 Nixie tube which is ~7,000hrs. This isn’t too big of a problem since the average person puts 13,000 miles on their car per year assuming average speed of 35mph that’s 372hrs of driving per year so by my estimate the tubes could last 18years, provided their protected from vibration.
So to run them on DC just remove the 100k resistors and put maybe a 50k resistor on the emitter? Sent from my iPhone > On Sep 4, 2018, at 12:06 AM, gregebert <gregeb...@hotmail.com> wrote: > > For the LEDs, yes > > For the neon bulbs, remove the 100K series resistor. The transistor is a > current-limiter. I took a wild guess at the operating current being 1mA; > check the datasheet for DC operation. Be aware that neon bulbs wont last as > long on DC vs AC, roughly 60% lifetime per datasheet. > > If you have 2 extra pins on the arduino, you can run the neon bulbs on AC > with 2 additional transistors + resistors. If that's desirable for you, go > back to your original design and make a few changes: > 1. 160 VDC --> 100K resistor --> NPN transistor collector. Instead of 2, you > will need 4. Note that the neon bulb is NOT connected in-series. > 2. Arduino_output --> 10K resistor --> NPN transistor base > 3. Connect 1 neon bulb terminal to NPN collector > 4. Alternately turn the NPN devices on at 50% duty cycle. This will drive an > AC square-wave on the neon bulbs. > -- > 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 neonixie-l+unsubscr...@googlegroups.com. > To post to this group, send email to neonixie-l@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/7ea0a037-56c5-4cf0-8915-4d4c58d1b4d3%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/BB7B2079-652B-4801-BBD5-4F35339B6A08%40gmail.com. For more options, visit https://groups.google.com/d/optout.
