Regulator Noise

[Paul Perry]

At 12:33 PM 17/09/97, you wrote:
>A short while back, there was a discussion on the noise output of three in
>regulators.  I did some looking in a databook and found some interesting
>numbers:
............for which much thanks.........

well looking at these figs I have to say that in a practical system it isn't
the intrinsic noise from the reg outputs that will be the limiting factor.

Unless the layout (PCB and hookup routing) is truly amazing then other
effects will far swamp anything from the PSU. It is like the high end
audio people, with .00003% thd amps driving speakers with distortion
ten thousand times greater.....

that having been said, I must admit I have managed to build PSUs with
an astonishing amt. of noise......but the worst things I wrestle with
are transition spikes from triangle generators in LFOs....NOTHING
stops some of these....

paul perry melbournw australia