Re: [neonixie-l] Re: resistance of filament warm vs cold

2013-12-09 Thread Tomislav Kordaso
Enameled wire is pain to strip mechanically. Back in my school days we used a pill of Aspirin and push the end of enameled wire shortly onto it with hot solder iron. Aspirin would melt and eat away the enamel, easing the tining process. Fumes are not nice to inhale, though. @Gideon if you prefer

Re: [neonixie-l] Re: resistance of filament warm vs cold

2013-12-09 Thread Adam Jacobs
Wow, great tip about the aspirin! I'll try that on my next transceiver build. :) -73 Adam W7QI On 12/9/2013 4:43 AM, Tomislav Kordaso wrote: Enameled wire is pain to strip mechanically. Back in my school days we used a pill of Aspirin and push the end of enameled wire shortly onto it with

Re: [neonixie-l] Re: resistance of filament warm vs cold

2013-12-09 Thread chuck richards
parts, and that stuff is plenty small enough for me! I have not worked on SMD yet, and do not especially relish the thought of it. Chuck Original Message From: a...@jacobs.us To: neonixie-l@googlegroups.com Subject: Re: [neonixie-l] Re: resistance of filament warm vs cold Date: Sun

[neonixie-l] Re: resistance of filament warm vs cold

2013-12-08 Thread Mark Moulding
I've been following this discussion for a couple of days now, and thought I knew what was going on, but I just went to my bench a physically put my hands on an IV-6 VFD tube. The filaments for these tubes are specified at 0.85-1.15 Vrms (nominal 1V), with a current draw of 50 mA. Note that

[neonixie-l] Re: resistance of filament warm vs cold

2013-12-08 Thread threeneurons
Put a new battery in your calculator: 1V/0.05A = 20 ohms Don't feel too embarrassed. If you look at the old Yahoo nixie forum, I have a long trail of on-line oops's. Your hot resistance measurement procedure is correct, and that's what's really important. On Sunday, December 8, 2013 10:14:55

[neonixie-l] Re: resistance of filament warm vs cold

2013-12-08 Thread Gideon Wackers
Well the first board is filled with tubes, and my head is filled with headache from peering at the board.. The enameled wire was very hard to solder even after burning off the enamel layer. Although I do not dare to show the abomination that I call soldering the tubes are all connected. Don't

[neonixie-l] Re: resistance of filament warm vs cold

2013-12-08 Thread AlexTsekenis
For any diameter of enamel-coated wire larger than a strand of hair, the burnt enamel should be removed to expose the copper. Otherwise solder wetting will be poor and the soldering process frustrating. You can do this using fine sandpaper, a file, or a sharp knife. Burning the enamel first

[neonixie-l] Re: resistance of filament warm vs cold

2013-12-08 Thread Mark Moulding
On Sunday, December 8, 2013 10:50:20 AM UTC-8, threeneurons wrote: Put a new battery in your calculator: 1V/0.05A = 20 ohms Oh - duh! I think the rest of the discourse was correct. (Sadly, no calculator was used - I guess it's my brain that needs the new batteries...) ~~ Mark -- You

[neonixie-l] Re: resistance of filament warm vs cold

2013-12-08 Thread Alex
I have a vague feeling that enamel wire fumes are fairly toxic, hence I used to sandpaper them first to remove most of it prior to a roasting with a lighter. My workplace used to have an enamel wire stripper, which was a funky bit of kit - 3 blades that spun round :-) - Alex On Sunday, 8

Re: [neonixie-l] Re: resistance of filament warm vs cold

2013-12-08 Thread Adam Jacobs
Yes, but why use enamel coated wire in the first place? I've only ever used it for winding inductors and transformers. I hate the stuff. Dipping in molten solder usually works to remove the enamel, with a clean-up pass using sandpaper. My favorite protoboard wire is the old 80-wire PATA ribbon