Tfort wrote:

On Mon, 02 Feb 2004 00:52:18 GMT, Uwe Langmesser
wrote:

I need a 12-14 V power supply for my new 2m tranceiver. On transmit I need
probably 10 to 15 amps and I hooked up and old transformer with a rectifier
and a filter section I get 15V at my filter with no load, the transformer is
good for 25 amps) but if I draw 15 amps I will get too much ripple,

so I need a regulating section.


Homebrewing is called for.

Last years radio amateur handbook has a design for a 28 volt regulated
power supply and while I would feel comfortable building a proven design I
do not feel comfortable to redesign that regulating section for my needs.

So the question is does anyone have a diagram for a proven 12-14 Volt
regulated supply for 10 to 25 amps??

Thanks for your help
Uwe

look at this...

http://www.rason.org/Projects/powsupply/powsupply.htm

Tracy

It can be easily improved. Eliminate the two .1 ohm emitter resistors
and connect one emitter to R6 and one to R7. Then replace R4 with a
pair of resistors, one going to R6 and one to R7, to average the
voltage from them to reproduce the current limit signal. You will
have to double the value so that two in parallel have the same total
effect. This change will not only eliminate two 10 watt resistors,
but will improve the current sharing between Q2 and Q3.


--
John Popelish