SV: Re: [sdiy] Linear PSU options .. 7815/7915 vs LM317/LM337 vs 723 etc

[karl dalen]

I forgot, if you want superior perfromance
for almost zero money but have to use your brain
use the 723, it can be used for negative voltages too.

If you want the least hasse and stress 
and no brain use, take the 317/337!

KD
(brain use means that the 723 is not
 entierly straight forward to use.)

--- karl dalen <dalenkarl at yahoo.se> skrev:

> Forget about using 78xx/79xx, use the 317/337 they
> are way better for SDIY use and general audio.
> 
> Ua723 are an old faggot (made in 1968) but way superior
> to 317/337 and a "large number" of the never LDO,s on the 
> market. The 723 is just the clasic regulator cirquit
> assembled onto a chip.
> 
> They are all dirt cheap!
> 
> KD
> 
> 
> --- Seb Francis <seb at burnit.co.uk> skrev:
> 
> > Someone just suggested the LM317/LM337 are supposed to be better than 
> > the 7XXX series.  Has anyone ever done a comparison between these?
> > 
> > Seb
> > 
> > 
> > Seb Francis wrote:
> > 
> > > Hi,
> > >
> > > I'm almost getting to the stage where it's time to move my 
> > > multi-compressor/gate/distortion project from the breadboard to PCB.  
> > > The final piece to design is the PSU.
> > >
> > > The requirements are not too unusual .. +/-15V at probably 200mA max, 
> > > and I want it to run from a standard AC wallwart (or maybe I'll stick 
> > > a transformer in the box - I haven't decided yet).  My first thought 
> > > is to use a 7815 & 7915, but I'm wondering is there some 'better' PSU 
> > > design?  What are some other options, and what actually are the 
> > > advantages in going for a more complex PSU?
> > >
> > > I've seen plenty of power supplies based on the 723, but I don't need 
> > > variable voltage or current limiting and it doesn't have to be exactly 
> > > +/-15V - near enough will do as long as it is a clean DC voltage!  
> > > Would I expect to get less noise from a 723 based PSU compared to 
> > > 7815/7915, or is this more a question of the smoothing, decoupling and 
> > > board layout?  Are there any options which will make a better PSU than 
> > > 7815/7915 but without the complexity of a 723 based PSU?
> > >
> > > Many questions, I hope some kind person can help me :)
> > >
> > > Seb
> > >
> > >
> > >
> > >
> > 
> > 
> 
>