Re: [neonixie-l] Re: Constant current source design

Nobody in this forum is dumb; some of us just havn't been bitten as hard as othersI found out the hard way you have to read and understand every spec item in the datasheet, or you will get into trouble. I've refused to use quite a few parts because a spec value wasn't provided; other ca

Re: [neonixie-l] Re: Constant current source design

Well that makes me feel dumb (which is fine, I will learn)! I should have had the sense to calculate a suitable load value and I should read the data sheets more carefully! Hopefully my trial and error will be instructive to others as well as myself. I'll do it again with calculated load value

[neonixie-l] Re: Constant current source design

A 5K-ohm load with 2mA thru it only drops 10V; with a 200V supply, you would have 190V across the mosfet. At 2mA load current, that translates to 380mW dissipation in the mosfet. From the datasheet, the max Theta ja I saw listed was 170 C/W. That would translate to a 65C rise, which is fine for

[neonixie-l] Re: Constant current source design

I finally got around to trying this using a 200V supply and one of these . I tried it first for a 2mA load current. I had to determine the Vgs experimentally. The datasheet looks like it should be about -2.5V. I got about -1.9V. I gave

[neonixie-l] EEV blog on Nixies

For those of you who haven't seen this, the crazy Ozzie has a 5 part video blog on his channel about an 8 digit IN12 nixie tube project that I'm currently watchinggood stuff (as usual).. https://www.youtube.com/watch?v=7uogKucrPks Cheers, Nick (the Pharma one..) -- You received this messag

[neonixie-l] Re: IV-1 datasheet English translation

On Sunday, May 7, 2017 at 11:47:33 PM UTC-4, Paul Andrews wrote: > I translated the IV-1 specs from this book > into English using Google > Translate. I uploaded the document to our google drive here >

Re: [neonixie-l] Re: In18 displaying cathode poisoning after 1000hrs or less.

Guess that’s too late for me now ☺ I’m sure all is OK now – it really was a broken power supply. From: on behalf of gregebert Reply-To: "neonixie-l@googlegroups.com" Date: Monday, 8 May 2017 at 20:29 To: neonixie-l Subject: Re: [neonixie-l] Re: In18 displaying cathode poisoning after 1000hrs

Re: [neonixie-l] Re: In18 displaying cathode poisoning after 1000hrs or less.

Can you determine (or measure) the current consumed by the nixes ? If it's a direct-drive clock and the voltages you provided are measured across the anode resistor (10K ?) the current is on the low-side, roughly 3.3 to 3.9mA. I believe the IN-18 is spec'd for 4-6mA. -- You received this mess

Re: [neonixie-l] Re: In18 displaying cathode poisoning after 1000hrs or less.

Just an update on this issue. Indeed, it was a faulty power supply. After I changed it in February, after this email, the clock did not show any signs of improvement. I did change it yet with another power supply somewhere in March, but the issue maintained. One of the digits started to show