[sdiy] power-question

[Happy Harry]

I would NOT use the 25.2 volt transformer for a +/-15 volt
supply... it is way too close.

Ulrich has the correct transformer, but needs to get rid of some
heat. either the load is too big, or his heatsinks are too small.

I like "Harley" heatsinks... if we need them cooler, we make them bigger... 
if that makes them ugly we chrome them !!!

H^) harry


>From: Scott Bernardi <sbernardi at home.net>
>To: Synth-DIY list <synth-diy at node12b53.a2000.nl>
>Subject: Re: [sdiy] power-question
>Date: Mon, 04 Jun 2001 21:03:32 -0700
>
>The 18v is an AC rating - like an RMS vale. The peak value will be 1.414
>times that - 25.45 volts. Also, the AC rating is at the rated load
>current, and so will be higher for lighter loads. The filtered DC
>voltage going into the regulator will be approximately the peak voltage
>minus a volt or so.
>For +/- 15v power supplies, a 25.2VCT transformer is a good choice.
>
>ulrich kehrer wrote:
> >
> > hi!
> >
> > a power supply problem...
> >
> > i have a 2x18V/2.22A tansformer and after the bridge rectifier i get +/-
> > 28V thus my +/-15V regulators get really hot (i know that the input of
> > the regulator should only be 3V higher than its output)
> > i suppose the 28V are not normal, are they?
> >
> > (the rectifier is a 50V/6A one; i replaced it with 4 1N4005 diodes but
> > that didn't change anything)
> >
> > any help concerning the +/-28V is really appreciated.
> >
> > regards,
> > ulrich
>
>--
>Scott Bernardi
>sbernardi at home.net

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com