I found this on the web:

http://www.ramseyelectronics.com/cgi-bi ... n&key=UAM2
http://www.ramseyelectronics.com/downlo ... s/UAM2.pdf

Seems to rely on the TPA3001D1:
http://focus.ti.com/general/docs/lit/ge ... =TPA3001D1

Has anyone seen a Class D kit like this that's a little more powerful
- 50W to 100W, say?

Thanks,

Michael

<mrdarrett@gmail.com> wrote in message
news:1187906265.009365.65740@e9g2000prf.googlegroups.com...
> I found this on the web:
>
>
http://www.ramseyelectronics.com/cgi-bi ... n&key=UAM2
> http://www.ramseyelectronics.com/downlo ... s/UAM2.pdf
>
> Seems to rely on the TPA3001D1:
>
http://focus.ti.com/general/docs/lit/ge ... Number=TPA
3001D1
>
> Has anyone seen a Class D kit like this that's a little more powerful
> - 50W to 100W, say?
>
> Thanks,
>
> Michael

Not kits but check out ICEpower from B&O. They have 100Watts to 10kW!

On Aug 23, 3:56 pm, "Bob Eld" <nsmontas...@yahoo.com> wrote:
> <mrdarr...@gmail.com> wrote in message
>
> news:1187906265.009365.65740@e9g2000prf.googlegroups.com...> I found this on the web:
>
> http://www.ramseyelectronics.com/cgi-bi ... action&k...
>
> > Seems to rely on the TPA3001D1:
>
> http://focus.ti.com/general/docs/lit/ge ... cPartNum...
> 3001D1
>
>
>
> > Has anyone seen a Class D kit like this that's a little more powerful
> > - 50W to 100W, say?
>
> > Thanks,
>
> > Michael
>
> Not kits but check out ICEpower from B&O. They have 100Watts to 10kW!



Ok, thanks.

Wait a minute... the TPA3001D1 is mono, huh, meaning I'll need 2 to
power 2 speakers... so that's 40W already... and wait, Class D is ~90%
efficient, vs. ~50% for class AB, right? So this will sound a bit
like an 80W Class AB system, right? (rounding the 90% to 100% to make
the math easier to do in my head)

And if I power 4 speakers, that's 80W consumed, sounding like 160W of
Class AB, right?

Hmm...

On Fri, 24 Aug 2007 16:05:29 +0000, mrdarrett wrote:

>> > Has anyone seen a Class D kit like this that's a little more powerful
>> > - 50W to 100W, say?
>>
>> > Thanks,
>>
>> > Michael
>>
>> Not kits but check out ICEpower from B&O. They have 100Watts to 10kW!
>
>
>
> Ok, thanks.
>
> Wait a minute... the TPA3001D1 is mono, huh, meaning I'll need 2 to
> power 2 speakers... so that's 40W already...

Right.

> and wait, Class D is ~90%
> efficient, vs. ~50% for class AB, right?

Right.

> So this will sound a bit like an 80W Class AB system, right?

Wrong. Amplifiers are rated by the amount of power they deliver, not the
amount which they consume. A 40W class AB will consume ~80W and deliver
40W; a 40W class D will consume ~40W and deliver 40W.

If amplifiers were rated according to consumption, everyone would be
selling "1kW" amplifiers consisting of an 8W IC amp and a 1kW power
resistor

<mrdarrett@gmail.com> wrote in message
news:1187971529.999536.135790@l22g2000prc.googlegroups.com...
> On Aug 23, 3:56 pm, "Bob Eld" <nsmontas...@yahoo.com> wrote:
>... and wait, Class D is ~90%
> efficient, vs. ~50% for class AB, right? So this will sound a bit
> like an 80W Class AB system, right? (rounding the 90% to 100% to make
> the math easier to do in my head)

If I'm not mistaken, audio amps are usually rated by output power rather
than input power. A 40 watt amp delivers 40 watts to the speakers
(neglecting speaker impedance as it affects the output power), whether it
class D, class A or anything in between. Ninty percent efficiency vs. 50%
will save you some heat sinks and power supply capacity, but it won't give
more output power.

mrdarrett@gmail.com wrote:

> Wait a minute... the TPA3001D1 is mono, huh, meaning I'll need 2 to
> power 2 speakers... so that's 40W already... and wait, Class D is ~90%
> efficient, vs. ~50% for class AB, right? So this will sound a bit
> like an 80W Class AB system, right?

NO.

Amplifier ratings are OUTPUT power not INPUT power, so efficiency is irrelevant to how loud they go.

Graham