[sdiy] +-12V supply

[harrybissell]

If its a large audio producing system... it could be harmful or fatal
to power amps, speakers etc.  Sounds really nasty in MY system.
fixed now :^P

H^) harry

"Roy J. Tellason" wrote:

> On Friday 14 January 2005 09:45 pm, groovyshaman wrote:
> > I am curious Harry - what is the advantage of a soft start mechanism?  Does
> > this in some way help alleviate the initial heavy current outrush that
> > occurs when turning on the power due to all of the decoupling caps on all
> > of the modules in my system?
> >
> > I've noticed that from time to time when I power up the 800ma power one,
> > one rail "goes flat" due to current limit circuitry I think - and I
> > immediately shutdown when this occurs.  Hopefully this does not harm
> > things.  (although I think I remember someone mentioning that running
> > certain ICs with one dead rail for any length of time will kill the part..)
> >  I'm still running the supply below the rated output once things power up
> > ok.  It's the initial current draw that's causing problems.
> >
> > George
>
> I've wondered about that,  operating some parts with one rail getting there
> before the other or one possibly going away due to some system fault.  I
> don't remember anything in any datasheets about this,  though.
>
> One of my projects from way back when was a "tracking regulator",  that would
> match both rails to each other.  Used an MC1468 (?) chip,  I think.
>
> > ----- Original Message -----
> > From: "harrybissell" <harrybissell at prodigy.net>
> > To: "Ken Stone" <sasami at hotkey.net.au>
> > Cc: <synth-diy at dropmix.xs4all.nl>
> > Sent: Friday, January 14, 2005 11:41 PM
> > Subject: Re: [sdiy] +-12V supply
> >
> > > I considered building a relay based "soft start" for my PowerOne
> > > supply as "building my own power supply".  The only time I would
> > > build my own is....
> > >
> > > 1) when I want cheap and dirty and don't care about performance
> > >
> > > 2) when it has to fit into a custom sized area
> > >
> > > 3) when I need an odd voltage not readily available
> > >
> > > H^) harry
> >
> > <snip>