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rurockn 10th October 2006 06:36 AM

Can anyone recommend a small 10-30watt DIY amp?
I live in the machine controls world at work but I would like to try and expand my electronics horizon and work on a project for myself - any advice would be greatly appreciated. And please don't laugh! Its hopefully a starting ground for a future hobby that will keep me from thinking electronics are boring and that I need a new job, haha.

I would like to build a small self contained amplified speaker box that I can plug my MP3 player into when I am at my desk. I will be using a speaker that was donated to me:

Blaupunkt car audio 2-way
Model: PCxb402
2-35 watts RMS
frequency response: 80-20,000 Hz
sensitivity: 90 dB

If anybody has plans or can veer me in the right direction it would be greatly appreciated. Thanks for reading.

juma 11th October 2006 09:11 AM

Hi rurockn,
your speaker will surely enjoy the company of LM1875 (nice sounding, cheap, very easy to construct). Yes, it can be made to sound better than datasheet schematic, but with those car speakers and MP3 player you'll never notice the difference.

Look for the schematic and datasheet at:

Crazy-Stereo 11th October 2006 11:23 AM

Here is another schematic that i found, using LM1875 too.

phn 11th October 2006 08:27 PM

Simplified/Gaincard schematic:

Hardwired Gainclone:

rurockn 11th October 2006 10:09 PM

Thank you for the advice, I will have a look at those links right now.

Nordic 11th October 2006 11:02 PM

Why not try your hand at building a proper gainlcone channel, try Decibel dungeon's basic inverted GC. Just remember that the input cap is incorrectly shown as 47uF, but it should read 4uf7. (I've pointed it out to Nuuk, but he's a busy man).

I think the LM3875 GC is realy in a sweetspot between 20 and 30 watts. And I don't think you can realistcaly compare the sound quality to the baby chip...

Do you know it it is an 8- or 4 ohm speaker...?

Leolabs 13th October 2006 02:39 PM

Go for LM3875.

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