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Old 28th July 2006, 11:54 AM   #81
raindog is offline raindog  Romania
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insides
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Old 28th July 2006, 11:55 AM   #82
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Old 28th July 2006, 11:56 AM   #83
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Old 14th August 2006, 04:02 PM   #84
Mick_F is offline Mick_F  Germany
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Some pics of my latest LM3886 based chipamp.



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The complete story is found here.

Mick
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Old 14th August 2006, 06:49 PM   #85
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Hi Mike,

You webpage is very easy to follow and the pictures are very informative.

I have a couple of questions about the Aluminum diecast case.

How thick is the aluminum?

Do you find that the case provides a suitable amount of heatsinking?
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Old 14th August 2006, 07:26 PM   #86
Mick_F is offline Mick_F  Germany
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Hi,

the walls of the diecast case are 2 mm. I am not absolutely sure about the heatsinking. It is running now since about two weeks (I never switch it off) and even when I play it loud, the case never gets more than handwarm (say 40C at the position of the chips). I was however a little surprised that the whole top of the case is always about 35 C or so, even if I dont play music.
Therefore I tought about adding two little heatsinks (black finned thingies about 4 x 4 cm) on the outside of the case and fix them with the same screws as the chips (seen on the last image).
I will post images if I make this change.

Mick
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Old 19th August 2006, 06:26 PM   #87
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Here are some photos of my TDA1554Q based Chipamp.. Unfortunatley no shots of the insides because in order to open it i have to disconect the speaker terminals and they were a pain to connect up in the first place..lol..
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Old 19th August 2006, 06:28 PM   #88
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Its basically just the datasheet schematic for a 2 channel bridged amp useing a single TDA1554Q except it uses 1uF input capacitors.. Case was bought on Ebay, Actually have two of them and they are stackable so i might make a preamp or another amp in the other one and stack them.. mabey for bi-amping my system..
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Old 19th August 2006, 06:31 PM   #89
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power supply is a ~100Va toroid i found in my box of bits, It has two 6.5V secondarries, gives me about 19V after rectification.. smoothing is a single 4700uF electrolytic bypassed with a 1uF something else (not sure.. bought them on ebay.. same i use for the input caps.. work nicley.. little blue things)
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Old 19th August 2006, 06:35 PM   #90
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Some of the more observant of you might notice it is still missing a standby switch (there actually was one but i managed to break it ) under the Led..
Still, I'm happy with it, more than loud enough, some of you might also notice that there is no volume control.. this is because i run it either from my computer or from my mixing desk depending what i'm useing it for at the time.. Sound pretty good aswell, better than any of my comercial amps..

Thanks for looking,
Owen
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