Comments on: Anode power supply for VFD display ( 5v to 80v stepper PSU ) http://www.larsen-b.com/Article/248.html Titanium Exposé Mon, 02 Jul 2018 13:54:48 +0000 hourly 1 http://wordpress.org/?v=3.5 By: mrsomeone http://www.larsen-b.com/Article/248.html/comment-page-1#comment-7733 mrsomeone Tue, 05 Jan 2010 13:48:20 +0000 #comment-7733 how i know anode of VFD is about +12V…you can simple drive directly from microcontroler (i tryed and it’s work)!
if you put too high voltage on the anode/grid you can damage VFD…
btw: VFD is LOW VOLTAGE TUBE

]]> By: admin http://www.larsen-b.com/Article/248.html/comment-page-1#comment-6937 admin Sun, 08 Mar 2009 13:20:55 +0000 #comment-6937 The ouput value depend on the frequency used for the PWM. 220uF, is for the max freq … F_CPU/256 = ~ 30kHz.

If your MOS is getting hot, choose one with a smaller Ron…

Bye

]]> By: Thorsten http://www.larsen-b.com/Article/248.html/comment-page-1#comment-6936 Thorsten Sun, 08 Mar 2009 12:51:17 +0000 #comment-6936 Hi,

just found your note about that simple VFD PSU. I tried it. It generates about 80V without load, with an 2,2kOhm it’s only 20V. What I don’t know how to regulate the output voltage. I tried using PWM but it have nearly no effect besides that the FET gets warm when high phase is long.

Any hints or maybe your regulation software would be nice.

Greetings from Germany
Thorsten

]]> By: Jkx http://www.larsen-b.com/Article/248.html/comment-page-1#comment-224 Jkx Wed, 30 Nov -0001 00:00:00 +0000 #comment-224 The BS170 is another candidate, because the BS107 has a high Ron (~25 Ohm), and the BS170 not. But the BS170 max output is 60v..

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