Re: audio amplifiers for PC's

gaurav.patil@xxxxxxxxx wrote:

> Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote in message news:<4263CFD4.66402196@xxxxxxxxxxx>...
> > gaurav.patil@xxxxxxxxx wrote:
> >
> > > Hello,
> > > I am looking to design a digital audio amplifier for my
> > > computer.My computer has a built in sound card which does not produces
> > > good sound effects more over i have low end 2.0 mercury speakers which
> > > makes the sound more worse.can any one please tell me about some sites
> > > where i would get complete circuit diagrams for desigining such a
> > > digital amplifier.
> >
> > Why do you think a *digital* amplifier would be any better ?
> >
> > > Also any design ideas from members is welcome.But to be precise i
> > > want something that has great sound quality(rather must have superb
> > > sound quality),with some features like digital bass boost,sound
> > > synthesis,surround sound etc.I know with all these features the
> > > circuit might become expensive but if any one can help me by
> > > suggesting something that can include all these features and still
> > > economical will be really nice.
> >
> > Those features aren't included in any 'digital amps chips' or chipsets
> > that I know of - that needs separate DSP.
>
> would you please elaborate more on such DSP's

DSPs are a veritable source of study in themselves. I've only relatively recently started using them - indeed
for audio effects like reverb.

Try here for a simple introduction. It's actually a very useful site that I've learnt bits from myself.

http://www.dsptutor.freeuk.com/


> > Yourt obsession with *digital* is illogical. Class D amps are used for
> > power efficiency not sound quality. The better Class D amps are getting
> > close to mid / low high end range analogue audio quality now though.
>
> So how should i improve the sound quality

Well.... most sound cards have really cheap and nasty amplifier chips built into them that are only intended to
output a few watts at relatively low-fi for 'squawk boxes' and the like. Therefore an external amplifier is a
good move.

Analogue amplifers ( except very poor ones - like the ones on sound cards ) outperform swiching amplifiers -
technically called Class D - that are sometimes marketed as 'digital amplifiers' though.

Most PC speakers ( 99.99% of them ) are utter garbage too.


> > > Just to remind that i want this circuit to be placed between my
> > > pc and speakers i cant afford to replace either of them.
>
> > Buy a cheap 2nd hand hi-fi amp off ebay.
> as i said i want to make it at home ,so i need a design that will
> allow me to interface this circuit(amplifier)with pc's audio out and
> my speakers

The above ( about ebay ) is still the best economic advice.


Graham

.

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