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/diy/ - Do It Yourself

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357609 No.357609 [Reply] [Original]

Can anyone recommend a good small desktop amplifier to power booksellers speakers?

Picture somewhat related, it is a lepai lp 2020a+ cheap and small.

Would rather go DIY

>> No.357611
File: 327 KB, 1417x1063, CIMG1193.jpg [View same] [iqdb] [saucenao] [google]
357611

Some recommended something powered by TDA7293 and I found this:

http://sound.westhost.com/project127.htm

Also picture related, the headphone amplifier I made.

>> No.357617
File: 75 KB, 720x537, Cmoy2.jpg [View same] [iqdb] [saucenao] [google]
357617

Another picture of a more portalbe amplifier I made.

>> No.357622

>>357609
How DIY are we talking, here? The Lepai is so cheap because it's based around a single chip/board combo, TA2020, I think. You could easily buy a Tripath-based Class-D (Class-T) amp board and make an enclosure for it. Or were you looking to make one from scratch?

>> No.357624

>>357617
I highly doubt an LM386 is capable of powering bookshelf speakers

>> No.357625

>>357622
Well I made things form scratch so it not a real problem, in fact I would prefer it.

>> No.357657

>>357624
I agree. I've been looking into guitar amps with 386s and they seem to be able to get just under 2w in certain designs. With a simple circuit they get around .2, if memory serves me.
Class D kits are the way to go, man. Either that, or put together a tube thing. Look up stereo tube amp on ebay and get a parts Heathkit or Bogen. I had a LaFayette stereo tube amp that put out about 50w/side, but I never got it to work and it weighed around 80lbs.

>> No.357661

>>357624
>LM386
This was a headphone amplifier

>> No.358124

Anyone?

>> No.358175

A modified CMOY amp. Found this with Google:
brettcave.net/howto/circuits/Project_HeadphoneAmp_BoostedCMOY_Combined.pdf

>> No.358329

>>358175
But will it power bookshelf speakers?

ITT: No one reads OP

Interested in a similar project so bump.

>> No.358344

>Would rather go DIY
Pick any of the hundreds of audio amplifiers on digikey and look at the datasheet for typical application circuits.

>> No.358350

>>358329
headphone amp and <5w amps like 386-based builds probably will suck at powering bookshelf speakers. Standard shitty computer speakers are 6-8w, and bookshelf systems regularly put 20-50w into speakers.
class D amp kits.
here's a cute one.
http://www.parts-express.com/pe/showdetl.cfm?partnumber=320-322

>> No.358370

>>358344
>>358350

OP here, would like something that sounds good. I have read that IC package sometime aren't very good

>> No.358376

>>358370
What's your audio source?

If it's just a pc, you can probably soft-hack it with minimal/no clipping...
If you have a proper radio/audio system that for some reason doesn't output reasonable audio volumes to the speakers, there's probably something wrong with it. Have you tried switching out each of the components in the circuit? (ie. different audio output, different speakers, different audio source, etc. Your local electronics shop is your friend if you don't have a spare, you can return what you don't want by saying the magic words "It wasn't compatible with my system.")

>> No.358390
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358390

>>358376
I have a USB DAC as source. SO yes in a way from my computer.

There is a misunderstanding, I have 2 good speakers and no amp for them, I will only use them with my computer and need a good sounding little amp to power them

I have read that IC package like TDA7293 (picture related) are handy because they only need a few other thing to work but are not the best fidelity of sound.

>> No.358395

>>358370
>I have read that IC package sometime aren't very good
Maybe if they are cheap or poorly designed ICs from the 70s. There are lots of modern, high power, low distortion ICs out these days.
Lots of /diy/ hobby-level circuits use integrated circuits anyway.

But if you want to use discrete components, that's cool too.

>> No.358396
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358396

I got a Topping TP30. It's on par with the amp that came with my Home-Theater-in-a-Box system. The rated Total Harmonic Distortion is 10%.

I honestly think you are better off getting a used full-size stereo receiver/amplifier.