Sv: Re: Sv: [sdiy] Filtering noise from power inverter in the van studio...

[Daniel Araya]

I just tried a few things to get rid of the switcher-noise;
A big isolation transformer did a good job but it pulled about an Ampere
more with no load. The best improvement however was to keep the inverter
far away from the audiocircuits, I think most of my noice was due to
induction from some coil in the inverter! Some EMF-shielding would
propably work good to.

/Daniel

>>> Bob Weigel <sounddoctorin at imt.net> 06-07-11 19:48 >>>
I don't know what the waveform looks like on this thing. It says 
'modified sine' but that could mean lo-res I suppose.  You'd think a 
good slow isolation transformer would get rid of the sharp edges and I 
may try that also. -bob

Daniel Araya wrote:

>I have the same problem in my soundsystem-setup. I haven't tried to use
>a isolation transformer yet, I bet i need a big one...And I don't know
>if a simpel filtercircuit is enough.
>Have you tried a more expensive inverter with "true" sine output?
>
>/Daniel
>
>  
>
>>>>Bob Weigel <sounddoctorin at imt.net> 2006-07-11 10:35:00 >>>
>>>>        
>>>>
>I'd love to be able to power everything up from the deep cycle battery
>
>in this machine I've put together.  Half a dozen or so synths and a 
>computer and power amp for the mains.  Then a couple other amps to 
>bi-amp my monitor system. 
>
>The inverter makes a horrible amount of noise with this setup...a bad 
>buzz.  Before when I did it with a lower power inverter I only got 
>significant noise when I ran my DSP digitech units.  However this time
>
>even w/out the peavey fx I'm running on the floor it still makes about
>
>the same amount of noise...even powering the amp separately.  Hmm. 
>This 
>is a 1000W rms inverter from a fairly decent company I think.  Can't 
>think of it off the top.  But anyway I suppose a ferro-resonant 
>transformer setup would be ideal but is there a cheaper way to get rid
>
>of this anyone has had experience with? Thanks, -Bob
>
>
>  
>