[R-390] OT: 30V regulator?

[Jim Shorney]

On Tue, 18 Sep 2007 09:22:16 +1200, kenny wrote:

>Regarding the supply that I want to build...My wishlist is for it to be 
>fully regulated and stable 50V and adjustable over a small range 48-51V. 
>I don't want to buy one, I want to build one but I just cannot find a 
>suitable regulator. Anyone have any ideas on where I can find a 
>regulator for this voltage OR a really good transistor (Bipolar or FET) 
>circuit?

Again, the LM317.  The 40 volt rating is for input-output *differential*. 
You can regulate voltages higher than 40 volts, as long as the difference
between input and output voltages does not exceed 40 volts.  You can
configure them with a pass transistor for higher currents, check the app
notes in the PDF datasheet:

http://www.national.com/mpf/LM/LM317.html

And do include the recommended protection diodes and bypass capacitors, you
won't regret it.





-- 
Jim Shorney      -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
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http://incolor.inetnebr.com/jshorney/