Thanks for all who had contributed.

I have decided to use 2x7815's mainly for the availability of parts even at
my local RS. And while I'm at it, I added a 7805 on one secondary and an
LM317 variable output on the other.

BTW- I read on the specs that the maximum input-output differential is 37
volts and there is a way to increase the regulator output voltage. Has
anyone tried using these devices at higher voltages at long as the in/out
diff is less than 37?

I dont know if it's allowed to post another question on a reply or should
have I posted a new topic?

Regards,

Robert Francisco


----- Original Message -----
From: Oliver Broad <obroad@TELINCO.CO.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, March 12, 2001 11:54 AM
Subject: Re: [EE]: PS configuration


> 7815 parts may be slightly cheaper than 7915
> 7815 parts are often more stable than 7915
> The downside is you need two bridge rectifiers.
> ----- Original Message -----
> From: "Robert Francisco" <robertf@MICROBALANCE.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: 10 March 2001 20:59
> Subject: [EE]: PS configuration
>
>
> > Hello All,
> >
> > I am building a +/-15 volt power supply, using a dual sec transformer,
> full
> > bridge, filter caps and LM7x15 regulators.
> > I thought of configuring it as 2 independent supplies,using a 7815 on
each
> > secondary, then tying them in series to get my +/- 15.
> > (for op-amp use)
> > Is there any advantage the above config  as opposed to tying the
> secondaries
> > to make a center tap and using a 7815 and a 7915?
> >
> > Regards,
> >
> > Robert Francisco
> >
> > --
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> > ways.  See http://www.piclist.com/#archives for details.
> >
> >
> >
>
> --
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