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Old 30th October 2007, 08:30 AM   #1
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Join Date: Feb 2005
Location: Lego Land
Default Noise filter for my amp? Please help

A couple of years ago I build a 200W RMS and now I have my own homemade completed UPS with a load off extra functions added plus working serial interface for PC, but I have a HUGE problem, then I try to debug my UPS it sometimes trip then I plug the amp in with the same UPS line, and I hear a noise on my speakers then it runs on battery power (mains failure), because of my modified sine wave inverter, but my mixer and PC doesn't make any noises

So is there a way of putting a cap or something in parallel with my amps transformer in the mains line to suppress the noise from my UPS, because it make my inverter tripping or (induction/emf/noise) feedback or something

My amp takes 13Watt on idle
The total is 200W then PC is on + screen + mixer + amp
Inverter is 400W and 800W peak

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Old 30th October 2007, 06:23 PM   #2
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Location: Avalon Island
>The total is 200W

But how much power does it use to deliver 200Watts?
How efficient is it?
How many channels?
[Grasshopper]:Old man, how is it that you hear these things?
[master]:Young man, how is it that you do not?
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Old 30th October 2007, 08:32 PM   #3
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the amp takes 13W AC power then on normal use "idle mode, no music playing"

its a 2 channel amp, but it makes a annoying buzz sound on my speakers then i run it on inverter power

transistors is MJ2955 AND 2N3055 a couple of them, but i need to make a plan with my amp or something because then it switches over to inverter power in a 3/60 of second dip it triggers something in my inverter to shut down "some times"
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