Re: [neonixie-l] How much voltage do cathode transistors need to be able to handle?

In my opinion, you want a transistor rated at the full anode-voltage in order to ensure reliability. This is probably more critical for MOS devices, because of the risk of oxide breakdown. Basically, when the cathode driver is off, there is only leakage current, typically less than 1uA.

RE: [neonixie-l] How much voltage do cathode transistors need to be able to handle?

On re-reading your message, if one digit is lit, the voltage drop over the anode resistor can be calculated according to Ohm's law, and determines the "real" voltage present at the tube's anode (Ub - Ura). The remaining open switching transistors now see the calculated anode voltage minus the

RE: [neonixie-l] How much voltage do cathode transistors need to be able to handle?

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

Re: [neonixie-l] How much voltage do cathode transistors need to be able to handle?

Thanks Bill! Is there any way to calculate that internal voltage drop when for unpowered cathodes (or when all the cathodes are off)? I don't believe I've seen it on any data sheet. On Friday, October 23, 2015 at 8:29:41 AM UTC-4, Bill v wrote: > > On re-reading your message, if one digit is

Re: [neonixie-l] Super easy wall adapter mod: 9V plus 170V at 80mA

Currently I'm planning to terminate the 3 conductor cable with a 4 pin 1.25mm JST connector: 9V/Gnd/NC/HV. Jt -- 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

Re: [neonixie-l] How much voltage do cathode transistors need to be able to handle?

Greg, The Nixie tube is not at all a resistive device. It's like a 150V Zener diode. Therefore, your analysis doesn't make sense. The Nixie tube has the ability to stand off about 70-100V before current flows, and then the current is microamperes. You can do this test easily with a

[neonixie-l] Re: Super easy wall adapter mod: 9V plus 170V at 80mA

I'd be interested in a couple of each. Jon -- 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

Re: [neonixie-l] Super easy wall adapter mod: 9V plus 170V at 80mA

> How many people would be interested in an AC adapter that puts out 9V and > 170V at 15W total? These could also be done in a 9V/300V output version. While your existing supplies are very handy, an all-in one would be a nice solution too. How would it be terminated? Bare wires? TRS

Re: [neonixie-l] How much voltage do cathode transistors need to be able to handle?

http://www.tayloredge.com/storefront/SmartNixie/DataSheets/Datasheet_SmartNixie.pdf If you look at Fig20 of the above data sheet, it shows the voltage on the "6" cathode transistor while the tube cycles continuously from "0" to "9". As you can see, the voltage on the transistor is not a single

[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,

[neonixie-l] IEE Nimo on eb*y, Nixie and Dekatron collections

Mine, just thought some of you might NOT have a saved search for these rare tubes. Comes with circuit boards & sockets. Search for IEE Nimo, it's the only one. :-) Been thinking of selling off my dekatron and nixie collections as well, nothing ultra-rare but some nice pieces. In the Nixie

Re: [neonixie-l] Super easy wall adapter mod: 9V plus 170V at 80mA

I would probably be interested in both, thanks. On Oct 23, 2015 7:42 PM, "taylorjpt" wrote: > I was talking to Cincon and they might actually be able to either sell me > unwelded units for modification or even make a custom unit. > > How many people would be interested in an

Re: [neonixie-l] Super easy wall adapter mod: 9V plus 170V at 80mA

I was talking to Cincon and they might actually be able to either sell me unwelded units for modification or even make a custom unit. How many people would be interested in an AC adapter that puts out 9V and 170V at 15W total? These could also be done in a 9V/300V output version. jt --

[neonixie-l] Re: IEE Nimo on eb*y, Nixie and Dekatron collections

If I thought for a second that Id have the money needed to buy that i'd try, but alas, estate sales of old lab scientists from Sandia and Los Alamos are going to be my only chance... On Friday, October 23, 2015 at 4:12:39 PM UTC-6, mjrippe wrote: > > Mine, just thought some of you might NOT

RE: [neonixie-l] How much voltage do cathode transistors need to be able to handle?

As you can see, no shortage of confusing answers and opinions. I thought science long ago abandoned the opinion or Socrates approach: -if one reasons long enough, the truth will reveal itself- long ago in favor of the empirical options. David Forbes is correct that the nixie behaves more like a