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

[Seb Francis]

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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