[hpsdr] Power Supply test

[Orval Chadsey]

I just use linear regulator IC's.. Use a bridge rectifier with a
center-tapped transformer and you end up with +/- voltages referenced to
the center-tap which serves as ground. Hang some large electrolytic
capacitors (2200 - 10,000 uf 50V) after the bridge.

Here are some links to IC data:

 http://www.national.com/pf/LM/LM337.html    adjustable negative
 http://cache.national.com/ds/LM/LM137.pdf  
 
 http://cache.national.com/ds/LM/LM7905.pdf   fixed negative
 http://www.national.com/pf/LM/LM7912.html 

 http://cache.national.com/ds/LM/LM123.pdf    +5V
 http://www.national.com/pf/LM/LM323.html 

 http://cache.national.com/ds/LM/LM150.pdf    adjustable positive
 http://www.national.com/pf/LM/LM350.html 


Even better is this part, positive, low-drop-out, both fixed (3.3V, 5V,
12V) and adjustable versions:

 http://cache.national.com/ds/LM/LM1084.pdf 
 http://www.national.com/pf/LM/LM1084.html 

All of these, and other needed components, are available from
http://www.jameco.com and elsewhere.

For construction and wiring tips refer to the ARRL or RSGB Handbooks.

73
Orval N6OZI
San Francisco, CA, USA



On Sun, 2007-05-27 at 06:39 -0700, Bob Fish wrote:
> Hi Guys,
> I am a pretty good builder, but not much of an engineer I'm afraid. How 
> about sharing the schematic of the power supply you built. I suppose 
> there is a transformer and some diodes or a rectifier, some filter caps. 
> Three or four regulators, one each for the supply voltages. But which 
> ones and the layout of the thing are the difficult part for us non 
> experienced designers.
> 
> Thanks in advance,
> 
> Bob   K6GGO
> >
> > I agree completely! An analog supply is RF free, simple to build and
> > reliable. There will be no RF interference to affect MDS.
> >
> > Orval N6OZI
> > San Francisco, CA, USA
> >



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