[sdiy] Filter Caps in linear PSU's

[Harry Bissell Jr]

Of course there should be a small cap at the
regulator output... as seen in the data sheet
to prevent oscillation. Probably a .1uF is Ok
located right AT the regulator output

H^) harry

--- Tim Daugard <daugard at sprintmail.com> wrote:

> > Don't forget... that all Jim Patchell's boards
> > have an extra 500uF on the outputs... in the form
> > of 5,000 .1uF ceramic decoupling caps.
> 
> Which is why I stopped putting caps at the output of
> the regulator. With all the bypass
> caps in each of the modules, the transformer
> couldn't supply enough start up current. I
> eliminated the cap right at the regulator to reduce
> startup loading (and added some
> resistance in line in some non-critical modules.
> 
> (and BBD Harry's answer is a smarter power supply
> with a warm up circuit.)
> 
> My final responce was use a double switch box with a
> larger transformer. I went from about
> 300 mA to 1+ amp.
> 
> Tim Daugard
> AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
> http://home.sprintmail.com/~daugard/synth.htm
> 
> 
> 
>