Search found 4 matches

by troj
Tue Sep 16, 2014 11:46 pm
Forum: Nixie thermometer V1
Topic: First Tube Showing All Segments
Replies: 6
Views: 18869

Re: First Tube Showing All Segments

Sorry about the late reply, for some reason I thought I'd already replied.... Yes they're fine - as long as they're high voltage NPN and PNP TO92 parts almost anything will work. No worries; I just figured you had something come up. It's working, life is good. Just waiting for ThinkGeek to get more...
by troj
Fri Sep 12, 2014 1:29 am
Forum: Nixie thermometer V1
Topic: First Tube Showing All Segments
Replies: 6
Views: 18869

Re: First Tube Showing All Segments

Replaced both transistors, and all is well with the world. :)

-Kevin
by troj
Thu Sep 04, 2014 12:29 am
Forum: Nixie thermometer V1
Topic: First Tube Showing All Segments
Replies: 6
Views: 18869

Re: First Tube Showing All Segments

Is it lit even when it souldn't be in a particular display mode?. If so is the LED on or off - if it's off and the tube is still lit then it'll be one of the driver transistors (the MPSA42 or MPSA92). It's always lit, in all modes -- when the display blanks, it blanks. But as soon as any tube is on...
by troj
Wed Sep 03, 2014 11:17 pm
Forum: Nixie thermometer V1
Topic: First Tube Showing All Segments
Replies: 6
Views: 18869

First Tube Showing All Segments

My thermometer has been working well for a while when I noticed today that the first tube has all the segments (including the decimal point) lit. This is happening regardless of the mode the thermometer is in.

I suspect something has failed....I just don't have a clue as to what it is.

-Kevin