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

[Harry Bissell Jr]

I would not think you can get a 'good, slow' isolation
transformer. Even a low frequenct one (60Hz) will have
a pretty decent high frequency response.

"Modified Sine" is an issue... it is exactly what you
describe, a very distorted sine wave. Good for power
tools and bad for audio

The ferroresonant transformer might help. You might
try a brute force filter but it is going to run very
hot (so will the ferroresonant...)  It will be large
and heavy.

H^) harry

--- Bob Weigel <sounddoctorin at imt.net> wrote:

> 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
> >
> >
> >  
> >
>