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Shoe box amp

insider9

Well-known member
Sep 20, 2016
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A mate of mine had Arjen Helder Mk III amp kit for a long time. Never got round to building it. It's class D (well class T amp). I got both my boys (8 and 17) to give me a hand to see if we can get it working. It was a great way to spend some tim with my sons. Here are the bits.



I always wanted to do something like this but without any schematics or instructions it took a little longer than it normally would. Not only that but 8 year olds are not great at soldering :) It took 2 hours to get it running. Not bad for a family effort with no instructions. We ended up making it into a power amp with only one working input. No on/off switch, no volume pot, only one stereo input, nothing fancy.

We had a wooden box we indended on using but without knowing it will actually work I didn't bother drilling. My mate has given all the bits in an old shoe box so that's what we ended up puttin it in.

Here is the "finished" article. Both amp board and power supply are not fixed at present.





Have been running it for an hour and a half on my second system speakers and must say it sounds surprisingly good. But best part was spending great two hours wit my boys being actually interested in my hobby. That's a win-win :)
 

insider9

Well-known member
Sep 20, 2016
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nopiano said:
insider9 said:
mond said:
That really is building a hifi on a shoestring :)
*biggrin*
...as long as you don’t tell us it sounds a bit boxy, or that it’s good for sole music!
*ROFL*

Testing so far included Bob Marley "Legend", Guns n' Roses "Appetite for Destruction"

By the looks of I should've been playing Puntera. You guys are on fire.
 

jimmy1

New member
Nov 5, 2013
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insider9 said:
If you look at the fist pic, I've not even used all the parts. Decided not to bother with input selector switch and a volume pot.
less to go wrong i suppose
 

insider9

Well-known member
Sep 20, 2016
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Exactly. We did have a fire blanket at hand at first use though :) I've dropped it off at my mate's today. Waiting for his feedback. He was suffiently impressed at initial listen.
 

andyjm

New member
Jul 20, 2012
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jimmy1 said:
Suprising how little you need for a basic amp
At the risk of being picky, there are probably a few thousand transistors in the SMPS and the class D control electronics.
 

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