According to Mr. Ohm, the voltage drop over a resistor is equal to the resistance multiplied by the current. In the off state, the current is 0A, so regardless of the value of the anode resistor, the drop over the anode resistor is 0V. The switching transistor therefore sees the full voltage minus the internal drop in the tube.
Bill From: [email protected] [mailto:[email protected]] On Behalf Of alex nolan Sent: Friday, October 23, 2015 3:30 AM To: neonixie-l Subject: [neonixie-l] How much voltage do cathode transistors need to be able to handle? I'm struggling to get my head around this. But considering the following setup for a nixie tube, wouldn't the voltage across the cathode transistor be close to 0? Most of the voltage should be dropped across the tube itself, with the remained dropped across the current-limiting resistor, right? Does it have to do with the transistors keeping the other cathodes open? If so, how do we calculate those voltages given the tube is on, just to a different cathode? <http://www.mcamafia.de/nixie/images/nix_th01.jpg> -- 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 email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/d1f607aa-b969-4288-be51-c6bbf4f23fdf%40googlegroups.com <https://groups.google.com/d/msgid/neonixie-l/d1f607aa-b969-4288-be51-c6bbf4f23fdf%40googlegroups.com?utm_medium=email&utm_source=footer> . For more options, visit https://groups.google.com/d/optout. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus -- 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/006001d10d8c%2451ed1710%24f5c74530%24%40com. For more options, visit https://groups.google.com/d/optout.
