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Old 18th May 2008, 10:22 PM   #631
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ps and transfo ready
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Old 18th May 2008, 10:24 PM   #632
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never mind the grounding ...i will fix it soon
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Old 18th May 2008, 10:25 PM   #633
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testing
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Old 19th May 2008, 01:54 PM   #634
troystg is offline troystg  United States
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Quote:
Originally posted by mekanoplastik
...i would apreciate some comments.....

A dab of heatsink grease since the chip is on a groove, and a washer to help spread the pressure of the screw holding the chip down.

Those are suggestions, not requirements.

I "personally" would have used different color wires for the ps to avoid potential confusion but then, some times I can be... well, you know.


Absolutely beautiful execution.
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Old 19th May 2008, 01:59 PM   #635
Nordic is offline Nordic  South Africa
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Beautiful implementation.... just keep the AC cord away from the signal wires...
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Old 20th May 2008, 08:09 PM   #636
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Quote:
Originally posted by bego2
My first working amplifier

gainclone lm3886

http://img.w3dizajn.net/viewer.php?f...0001902jkc.jpg
http://img.w3dizajn.net/images/P1000189teeq.jpg


i used the cheapest capacitors and the sound is beautiful...i`m 18. years old and i doesn`t have lots of money to buy a excellent parts.


Finally! There arenít only old man (and women?) here! Haha
Since I discovered this forum, Iím getting very interested in the whole DIY audio thing.
Iím 19 and just finished my first amp, it will suddenly not be my last.

specs:
Transformer: 500VA toroidal (22V-0V-22V)
Rectifier: 8 x MUR860 (with 100nF capacitors and heatsinks)
Buffer capacitors: 25mF per rail (50mF total)
Amplifier: 2 x Bridged LM3886 setup (BR100)

Will do an approximately 100W to 120W per channel at 8Ohm.
I can't say anything about the quality of the sound because I still havenít got good source/pre amp/speakers (any volunteers?).
All I can say the sound is very detailed, and it's _very_ powerful!

I really learned a lot of this project, for example that 200W is completely useless.
Normally I use 500mW and playing very loud maximum 10W, if I knew this I probably had build the single LM3886 setup.

Enough talking, here are the pictures:
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The back plate is cut with an CNC water jet (I only made the Autocad drawling), heat sink is done manually.

Now I'm gonna build a preamp in an identical housing only less high. It will have an embedded system (8051) and perhaps a DAC.

Thanks for making this possible for me, keep up the good work!
Founded feedback is always welcome...



Robert
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Old 20th May 2008, 08:21 PM   #637
tubee is offline tubee  Netherlands
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Nice amp Robert!!

1 suggestion: try to get proper solid copper rails instead of the aluminium ones.
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Old 20th May 2008, 10:34 PM   #638
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RobertJ88

Quote:
Iím 19 and just finished my first amp
I'm 47 and I've just finished my first amp, it's nowhere near as good as yours, beautiful work by any measure.

John
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Old 21st May 2008, 04:32 PM   #639
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Another CMOY...
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Old 21st May 2008, 05:17 PM   #640
luka is offline luka  Slovenia
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Hi

Woow that is small, nice. Any other pic of it
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