[sdiy] power supply

[Tim Parkhurst]

I think "SG" is for a Star Ground. In other words, all grounds connecting to
a single point ONLY. All the other ground connections radiate out (like the
twinkle of a star) from this one point. I've seen this used on some boards
with both digital and analog circuitry as part of an isolation scheme. There
is only one point where the grounds from the digital side and the grounds
from the analog side are tied together. What this is used for on the PAIA
stuff, I have no idea. Am I totally off on this? Any EEs out there?

Tim Parkhurst (Tim Servo)
Design Engineer

Silicon Bandwidth
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-----Original Message-----
From: Andre Majorel [mailto:amajorel at teaser.fr] 
Sent: Tuesday, July 30, 2002 3:16 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] power supply

On 2002-07-30 16:04 -0400, Caleb Johnston wrote:
 
> This should be an easy question to answer for the experts.  I want to
> do this correctly so I dont fry anything.
> 
> I have a module that runs on 1 9V battery.  I want to run this module
> from a power supply.  The power supply is Paia's 9770u which is the
> 'unregulated +/- 18 V DC @ 350 mA.  The connections on this power
> supply are +V,G,SG,-V.  The module only has + and - for the battery.
> 
> What would be the best way to do this?  Do I need to then regulate the
> power?

Yes. You could use a 7809. The selection guide says that the
MCT7809CT can handle up to 24V at the input so it should be
fine. Connect +V to pin 1 of the 7809 and G to pin 2. Connect +
of your module to pin 3 of the 7809 and - to pin 2. You may have
to tie the 7809 to a heat sink if the module sucks too much
power (unlikely).

I'm not sure what SG is. Signal ground ??

-- 
André Majorel <amajorel at teaser.fr>
http://www.teaser.fr/~amajorel/



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