Re: generating 180VDC at 5mA or so, simply...
From: Ian (${send-direct-email-to-news1021-at-jusme-dot-com-if-you-must}_at_jusme.com)
Date: 09/01/04
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Date: Wed, 01 Sep 2004 19:53:38 GMT
On Wed, 1 Sep 2004 18:19:11 +0000 (UTC), Ken Smith <kensmith@green.rahul.net> wrote:
>Why not use the neon tubes as part of the voltage regulation. ie: control
>the current through them.
Similar to how I've done it: PIC PWM driving logic MOSFET, 1:10 transformer on
small E-core, bang-bang "regulation" through PIC analog comparator. Tubes driven
by switched current sink (1 x MPSA42 per digit, driven direct from PIC with only
one low-power resistor needed per tube). Protection by zener and thermal fuse on
the MOSFET. PIC also does the clock stuff. Takes a few liberties but has a low
parts count and works quite well...
http://projects.jusme.com/cgi-bin/projects/projects/index.pl?id:nixieclock1
(pdf's of the schematics on the "files" page)
-- Ian 'Milk below!'
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