My original intentions were to create the sine to drive an AC motor. After
i started thinking about incorporating it with EMC, i thought that it might
be possible to get a higher frequency output than the parport, for running
pwm driven amps. I'm curious if anyone is familiar with coding involving
sound, and if anyone knows what kind of latencies are typical with changing
sound outputs and such. I think it would be an interesting alternative to
be able to use cheap sound blaster cards (SB16 pci) to drive a couple PWMs
each. if it would be possible to generate PWM, how much more complicated
would it be to use the surround / center channels on sound cards so
equipped?
I guess i'm thinking of this as a possible new hardware option, it's as
common as the parport, and if it could be faster too, why not? jut sharing
the ideas with the community, not trying to get anything specific
accomplished right now.
as for why i wanted to use an amplifier as a VFD, I'm into doing stuff that
can actually be productive from junk that is otherwise laying around in one
of the many "i can use this some day" piles. (with little to no money
spent) The amp I'm using for my experimentation is a 4 channel class D car
amp rated for 200 watts / channel at 4 ohms, bridgable and runs 2 ohm stable
while bridged. Powering the amp during play time is a 26AH 12V lead acid
battery, in actual use it would probably be a 600 watt power supply i have.
when i was playing around i was seeing 60V peak to peak while powering a
small dollar store food processor. I got the idea from an electric mixer
that on the lowest setting was waayyy too fast.
On Tue, Apr 1, 2008 at 3:13 PM, Gene Heskett <[EMAIL PROTECTED]>
wrote:
> On Tuesday 01 April 2008, Roland Jollivet wrote:
> >I'm sure this will fit the bill
> >
> >http://www.national.com/pf/LM/LME49811.html
> >
> >
> >Regards
> >Roland
>
> As a driver for the high power analog stages yes, but note that its forte
> is a
> 200 volt output swing, at only 9 milliamps of output, so to continue from
> my
> other message, the end result, given a sufficiently robust output stage
> for
> it to drive, would be something very badly in need of heavy duty, noisy,
> cooling. A 29 db rated muffin fan could cool quite a few of those gizmo's
> from Ramsey. All we need are motors that run at full song on a 40 volt
> peak
> to peak drive. The question then becomes, are such motors available?
>
> I do not know without googling.
>
> We can switch many tens of amps of current on and off with little power
> loss
> with the right devices today. To do analog control of that much voltage
> and
> current would lose 80% of the input power in the devices that would need
> to
> get rid of 2kw worth of heat for a 500 watt motor drive, and the devices
> have
> to be 100 times as rugged. That doesn't make sense today when a class D
> circuit can do this 500 watt motor with maybe 10 watts of heat loss, and
> probably, because it doesn't run that hot, 10x as dependable as the analog
> version.
>
> [...]
>
> --
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Don't confuse things that need action with those that take care of
> themselves.
>
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