less hum: switching power supply?

[Augusto Pinoche]

Im not into slamming anyone in this subject!!!
Im just expressing my experience.

Besides as you say ther is other and better regulators
to use,infact people, talking about slaming, i remember the
debate about the exellence over the ua723 versus LM78xx
some years ago!! ;->

Reg
DF


>From: Jay Martin <jmar at intface.com>
>To: Augusto Pinoche <augustopinoche at hotmail.com>, 
>synth-diy at node12b53.a2000.nl
>Subject: RE: less hum: switching power supply?
>Date: Mon, 5 Jun 2000 17:41:22 -0400
>
>Before I continually get SLAMMED on this...I never said that the LM78xx
>series were BAD, just that there are better alternatives.
>
>Jay Martin
>
>-----Original Message-----
>From: Augusto Pinoche [mailto:augustopinoche at hotmail.com]
>Sent: Monday, June 05, 2000 4:18 PM
>To: synth-diy at node12b53.a2000.nl
>Subject: RE: less hum: switching power supply?
>
>
>Me to, i used a lot of LM78/89 devices
>and have wery few problems ehit them.
>
>The reverse factor becomes only a problem if
>you have a large cap after the regulator and
>no load, if you have a load the load will usually
>discharge the cap.Infact the LM series needs a
>small load if no load is present at the LM's
>output they can start to oscillate.
>
>Othervise i use LM317/227 and 2951 a lot and they
>all work fine for ther apps when they are not overloaded.
>
>DF
>
>
> >From: Paul Perry <pfperry at melbpc.org.au>
> >To: synth-diy at node12b53.a2000.nl
> >Subject: RE: less hum: switching power supply?
> >Date: Tue, 06 Jun 2000 02:37:58 +1000
> >
> >At 11:45 AM 5/06/00 -0400, Jay Martin  wrote:
> > >I beg to differ,
> > >The 78xx series of regulators do NOT have built in protection for
> >shorting,
> > >overheating or reverse-voltage damage
> >
> >Hmm.. there is certainly overheating protection on the National Semi 
>78xxs.
> >And, I've used a hell of a lot of them & never seen '8 volt spiking'.
> >What do you have to do to get these spikes?
> >
> >perhaps this is time to note that not all chips with the same type #
> >are always identical.
> >
> >paul perry Melbourne Australia
> >
>
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