[R-390] Class D Amplifiers

Fri Feb 7 16:13:38 EST 2014

So I build Hi End Tube linear amps for Stereo nuts! You're right on with
the Class D amp issues but for communications purposes, it should be fine.
Usually they switch between 80 and 100 kHz and the LPF takes all of the
junk out of the audio band. They're not my favorite for music but for the
r-390a it should be fine. And at that price????   Roger WA3YTM

On Fri, Feb 7, 2014 at 3:56 PM, Chris Kepus <ckepus at comcast.net> wrote:

> How could you go wrong at that price, Barry?  If it didn't work out with
> the
> R-390A, it would make a nice little aux amp for the workbench and other
> projects.
> There's gotta be an early adopter! :-)
> 73,
> Chris
> W7JPG
> PS: Bought a lot of stuff from Parts Express and have been very happy with
> them.
>
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
> On Behalf Of Barry
> Sent: Friday, February 07, 2014 8:45 AM
> To: R-390 List
> Subject: [R-390] Class D Amplifiers
>
> A while back, there was some discussion on this list about outboard audio
> amplifiers.  I don't recall whether these came up, but has anyone worked
> with Class D amplifiers?  If so, are they troublesome - specifically with
> respect to noise?
>
> From what little I've read about them, there are some pretty rigorous
> constraints with grounding, filtering, etc., to keep them from sourcing too
> much noise back into the system where they're used.
>
> Just looking at the one below and thinking that, at the price, it would
> make
> a decent amp for the R390.
>
>
> http://www.parts-express.com/pam8610-2x10w-class-d-audio-amplifier-board--32
> 0-604
>
> Bad idea?
>
> Thanks,
> Barry - N4BUQ
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