piclist 2008\07\16\224242a >
Thread: Power supply project
face picon face BY : Jinx email (remove spam text)

> My guess is they have a few secondary windings from the mains
> transformer

Hmmm. There's a thought. One transformer I'd probably use has
secondary taps. I guess for using the control circuit I've posted you
could add a boost switcher so that the control circuit always has a
constant V+, no matter what DC is going through the main bridge to
the output transistors, unless the PSU has a small secondary just for
the electronics. LED displays are pretty hungry so it actually would
be a good idea to have a separate supply for them rather than waste
capacity of the main winding. And changing the secondary would
certainly go some way to reducing losses at low output voltages

<04f201c8e7b6$9fa69de0$89aafea9@ivp1> 7bit

See also: www.piclist.com/techref/power/actodc.htm?key=power
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