Thread: audio questions

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Originally Posted by bradbaum

95% of the audio buzz these days is related to shielding ground loops - I am a professional AV engineer and in the old days, yes the buzz was usally related to running audio lines with the power lines. today with the power factor corrected devices and the electronic balancing of the audio signals this is rarely the case. Mostly the buzz comes from shielding not done correctly (the shield should be droped at the microphone).

very true, in studios we don't run into this as much though as most of the equipment is installed and any noisy gear has already been fixed ( ground floated, signal ground isolated ) but with allot of the cables, mainly mic, the pres will amplify any noise on the line from an kind of power cables. imho as a rule of thumb dropping a ground should only be done after other things have been ruled out, as a ground lift could give someone a nasty shock

ok i think i need to clarify
i was getting electrical spikes that were triggering
the chip
but i will be using it with a prop 1 controller , computer speakers and a solenoid
and of course a trigger of some sort

if you are using it with a prop1 make sure to put a diode on the solenoid to prevent kickback, also i am wondering if a small capacitor on the trigger leads might absorb some of the spikes ? just a thought

Try a cap across the leads, I do a lot of control electrical work, and every once in awhile we have to install someones home made module, because its saving them money, and we run into this problem, and if we can't fix it by moving it, shielding it or rewiring it, then we will throw a cap on it, so give it a try, it just might work.

ok so i need to put a cap on the electrical going into
the audio chip right?
about what size do i use and does it matter what wire
connects to what side of the cap
sry for all the questions i trying to learn as much as can

can't guarantee it will work but, i would use a small capacitor between .2uf to .5uf across the dry contact terminals for the trigger with the positive going to the in of the cap and the out of the cap going to the negative so that it can clamp and drain to ground, this should help filter out small spikes on the trigger line.

I just bought one of the cowalicious boards and it seems like its pretty good. My only problem is that the speakers buzz when there is no sound playing. Is there a way to stop that? I"m not a geek so I'm hoping for a beginner styly fix.