[sdiy] dare I say - decoupling?

[Roy J. Tellason]

On Saturday 03 September 2005 02:10 pm, harrybissell wrote:

> Even better, always use onboard voltage references for critical circuits.
> The biggest mistake mmost people make is setting some critical parameter
> (like VCO expo reference or sawtooth reset level) from the main power
> supply. This is asking for trouble !!!

Seems to me that it was Moog Music that wanted me to spend the $$$ on a 4-1/2 
digit meter so I could calibrate the power supplies,  which as it turned out 
had other problems...

> Best idea... don't use LED indicators. They look cool but cause a lot of
> current variation as they switch on/off

If I were going to build something that had a mix of analog and digital,  or 
analog and stuff like LED indicators,  I sure as heck wouldn't use the same 
power supplies for both.  Or grounds for that matter.  Maybe used split 15V 
supplies for the one,  and a +5v supply for the other.  Real easy to do...

And completely separate distribution,  including the grounds.