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Re: Variable PS Design

Posted: Tue Nov 15, 2005 7:54 pm
by Edd
Czesc Perwer ?

If you will check out the two referenced power supply circuits that I provided above in my posting , you will find that they both are utilizing supplementary bias sub-zero referencing and will drop down to the zero low level on the supply output.
(Not that I really have ever had to be that close to that low of a voltage level at any power level..in all of my years of using power supplies. Now, as a miniscule bias supply at very minimal current levels…..yes……but that was usually by using a battery with a shunted potentiometer to tap off a variable level.) (That mainly being due to its affording power supply isolation and the absence of noise.)

73's de Edd
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Re: Variable PS Design

Posted: Wed Nov 16, 2005 2:21 am
by perwer
Hi. You know, i find in data sheets in national semiconductors this schematic...
http://www.perwer.dolsat.pl/schemat/030.jpg
But i must replace LM117 by a transistors and other parts from this schematic...
http://www.perwer.dolsat.pl/schemat/lm117.jpg
I don't know how connected it. Please help.