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

[harrybissell]

Amen.  What he said !!!

H^) harry

Paul Perry wrote:
> 
> There's another side to this regulator debate, and that is:
> just how good does the regulated supply need to be?
> When one looks at precision analog circuitry, you often see
> power rails no better than you would get from a LM78xx,
> but wherever a *really* precise voltage source is required, there is a
> precision source dedicated to just that. And it is right there on the
> board where it is wanted.
> Which at a stroke solves the problem of noise generated on the
> power rails by switching transients etc.
> And, speaking of transients...... anyone serious (including some
> members here, I notice) have separate power rails for the digital stuff,
> and for the analog that they try to keep noise free.
> I personally think, the difference between the 78xx and other regs,
> is swamped by these other techniques..... and if you want to go the
> whole distance, you are going to need to have precision voltage
> diodes & separate analog/digital lines anyway!
> 
> paul perry Melbourne Australia