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

[Seb Francis]

Thanks Jay, this is a great article .. just the kind of thing I'm 
looking for.

Seb


Jay Schwichtenberg wrote:

>Yes,
>
>I wouldn't put 7XXX stuff in audio circuits. They are noisier than the
>LM317/LM337. Linear Tech makes some even better ones. Might also look into
>some of the new LDO (Low Drop Out) regulators. One problem now days is that
>they spend most of the development doing positive regulators and not
>negative ones. Mainly for all the low power portable equipment that is being
>made. Thye don't need good neg regs so they aren't working to hard in that
>area.
>
>Check out the 4th bullet down:
><http://waltjung.org/Regs.html>
>
>Happy soldering and to many more modules in our synths in 2006!
>Jay S.
>
>-----Original Message-----
>From: owner-synth-diy at dropmix.xs4all.nl
>[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Seb Francis
>Sent: Monday, January 09, 2006 7:55 AM
>To: Synth DIY
>Subject: Re: [sdiy] Linear PSU options .. 7815/7915 vs LM317/LM337 vs
>723 etc
>
>
>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
>>
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>>
>>
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