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From: Lizard Blizzard
Subject: Re: DC/DC converter for LCD Panel Meter; another question
Date: Fri, 13 Sep 2002 17:31:46 -0700
X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U)
Dave Martindale wrote:
> "Mark Holden" writes:
> >I forgot to mention each has a Vreg downstream of the converter; 9V DC/DC
> >converters would have made life easier [one regulator for all the inputs],
> >but I didn't find them.
> The DPM's I'm familiar require completely isolated power. You need a
> DC/DC converter and regulator for *each* DPM; you can't share a single
> 9V supply between more than one DPM. You could build your own DC/DC
> converter with multiple isolated secondary windings on the transformer,
> then have one regulator per output. This would give you many isolated
> 9V outputs from just one 12V input and oscillator - but you still need
> one regulator per DPM.
I'm not sure why you say the secondaries have to be isolated or more
than one. With a simple blocking cap, you can make a single secondary
put out multiple outputs each isolated from the other by putting
blocking caps in series with the secondary leads to each rectifier.
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