[sdiy] keeping signals seperate..avoiding noise

[Dan Snazelle]

a few questions

if i have a clean source going through a buffer and then that splits into one half going into a PLL and a divider and the other half getting boosted by a x10
opamp stage...WHY would i be hearing the divider sounds in the background of the clean stage?

this is very different than my lfo bleedthrough of the other night (into the vco) but it is similarly noisy.

i have all pcbs on metal standoffs going into a metal box....could this cause the high frequencys of the PLL signal (and octave down) to bleed into the clean opamp? (though none of the standoffs touch traces)

maybe i should put a regulator JUST on the divider board?

i have bypass caps.
pretty good ground planes.
and seperate lines for digital and clean grnd.

what about a bunch of wires laying all over each other or being bundled...can this cause signals to mix?

i think i really need to understand noise better.

any good books on this?

thanks


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