[sdiy] Star ground vs star power

[Harry Bissell]

Of course star power has the same advantages as star grounds... The benefit may be less noticible as ground is often used as a 
reference, while power supplies are usually not used directly in good designs (you bad designers know who you are...)

Many common chips enjoy high power supply rejection ratios, which tend to mitigate power supply noise issues.

It is VERY GOOD practice to separate high current power supplies (LEDs, other displays, power amps etc) from low current, sensitive
circuits like preamps, vco cores, etc.

Providing a complete current path from power supply to module and back to ground (hopefully with twisted pairs) can reduce system
EMI levels signfificantly.

As always, your mileage may vary. Often a single, robust power distribution system is enough. For the best performance, the power supply
architecture should be carefully considered.

(in power electronics, power distribution MUST be carefully handled right down to the individual chip level, with care taken to minimize
inductive loops. The "twisted pairs" referenced above helps in that regard. Careful use of ground and power planes is another potent weapon
in the arsenal.

H^) harry

----- Original Message -----
From: Karl Ekdahl <elektrodwarf at yahoo.se>
To: synth-diy at dropmix.xs4all.nl
Sent: Fri, 02 Dec 2011 16:46:01 -0500 (EST)
Subject: [sdiy] Star ground vs star power

Hi list, so i was wondering, while star grounds have obvious advantages, 
how about star power? would that really benefit a larger circuit or is 
it just a waste of time to incorporate that?

Thanks

Karl

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-- 
Harry Bissell & Nora Abdullah 4eva