[sdiy] Power Supply arrangement

[harry]

Hi Merv...

inline

Merv Thomas wrote:

> Here's a couple of questions regarding power supply distribution - I'm
> just getting ready to lay out my boards  so comments & advice would be
> welcome...  Is it better to have a power supply feeding out [say]
> +/-18V to each module and then regulate down to +/-15V on each module
> OR just set up the PSU to supply +/-15V and feed that directly to each
> module?
>
> Either way. The +/-18 will elimiate 99.5% (or so) of interaction
> between
> modules... as will the +/-15 with proper decoupling and wiring.
>   Besides smoothing on the PSU module itself, how much decoupling
> should I add to each module? Assuming an electrolytic + ceramic on the
> inputs to each module, is a decoupler to each rail on every IC too
> much [or not enough] ?
>
> Sounds just about right to me. I use one ceramic at every IC power
> supply
> pin... I actually place those FIRST on the layout, not last. They are
> real important
> and not often do I fall victim to power supply troubles !!!
>
> H^) hary
>
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>   Merv Slowly getting the hang of it