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Old 25th May 2005, 05:44 PM   #1
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Default 4 channel parallell LM3886 amp

Hello!

I would like to show you some pictures of my latest projekt that I've just finnished. My four channel parallell LM3886 amplifier.

My name is Adam Eng and I'm 20 years old. I live in Karlstad, Sweden. I study electronic produktion and this was one of my side projekts (too much spare time ). I've been reading this forum for about 3-4 months and got realy interested in these "gainclones". Almost all the information needed to build this amp has been found in this forum and i must say thank you to all who share information and designs!

The amplifier is based on the PA100 schematics and the pcb layout is based on alexw88's design with some changes to suit my needs.
The power supply consist of two 500VA trafos, eight 35A rectifiers (modded with 22nF caps across the legs) and 25000uF/rail (50000uF/channel) subberized.
The case is handmade by me an is mostly made out of aluminium. The feet of the amp is made from 2,5cm thick plexiglass wich I've put a ultrabright blue led in each on of to act like powerindicator.

My english is far from perfect but i hope you understand

Now it's time for some pictures!

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Old 25th May 2005, 06:02 PM   #2
wxn is offline wxn  Lithuania
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Awesome
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Old 25th May 2005, 07:47 PM   #3
Nuuk is offline Nuuk  United Kingdom
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Very good. I love the lighting underneath!
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Old 25th May 2005, 09:11 PM   #4
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I'm glad you like it!

Forgot to say that it works like a charm without any 50Hz hum or hiss, just total silence when no sorce is connected.
It's also playing music better than anything i've ever listened to. Very detailed mids and highs with total control of the bass wich is tight and well balanced. Over all i just love it
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Old 25th May 2005, 09:40 PM   #5
G4ME is offline G4ME  United States
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where did you score those nice heat sinks?

Got any pics of under her skirt?
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Old 25th May 2005, 10:41 PM   #6
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Cute.
Do the feets glow from blue to orange while the amp gets warm, a la Musical Fidelity?
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Old 26th May 2005, 12:22 AM   #7
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LOL!!! is it just me or would i be right saying those "heatsinks" are actually individually cut "L" extrusions all bolted to a flat piece. look close at the last picture.

thats the perfect way to get a heatsink the right size. you can get those cheap from home depot or any place like that.

very nice looking amp you have made there.
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Old 26th May 2005, 02:49 PM   #8
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Quote:
Originally posted by G4ME
where did you score those nice heat sinks?

Got any pics of under her skirt?
Just as neutron7 figgured these heatsinks are made by myself. The "L" extrusions are also made my out of an aluminium sheet wich I've cut and bent. The base for the heatsinks are 8mm aluminium and the fins are 3mm.

Here's a better picture of it (hig res):
http://www.home.no/drdead/forstarkare/Forstarkare6.jpg

And here's one of the inside (the amplifier part anyway):
http://www.home.no/drdead/forstarkare/Forstarkare7.jpg



Quote:
Originally posted by carlosfm
Cute.
Do the feets glow from blue to orange while the amp gets warm, a la Musical Fidelity?
Hehe no, unfortunate not but they glow (quite weak though) even if the amp is "off" as long as the power cord is pluged in and showing that the amp got power.

Feel free to ask any questions. I'll do my best to answer them.
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Old 26th May 2005, 08:33 PM   #9
G4ME is offline G4ME  United States
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Is that solid copper separating the two layers?
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Old 26th May 2005, 09:28 PM   #10
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Quote:
Originally posted by G4ME
Is that solid copper separating the two layers?
Yes. It's one sheet of 1mm aluminium and a sheet of 1mm copper bolted together to act as a sheild and separating the power supply from the amplifier boards. Works realy well. The only negative thing with this amp is the weight... 25kg
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