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Old 25th May 2001, 02:08 PM   #1
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http://www.diyzone.net/diy/20000724001.htm

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Old 25th May 2001, 02:49 PM   #2
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Whatever it is, the amp is on a chip. In other words, not discrete. Clean looking layout though.
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Old 25th May 2001, 05:37 PM   #3
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Jupp, looks like it's based on the National Semiconductor:

- LM3875 56W Audio Power Amplifier chip.
- LM3886 68W Audio Power Amplifier chip w/mute.
- LM675 some sort of Power OP amp.

Probably it's some sort of Gaincard clone. I'm currently thinking of building a version based on the LM3875 chip.
You can find more info on:

- Gainclone
- IC Amp

The Gaincard amplifier cost $3,300 and is based on some chip amplifer probably costing around $5. It would be interesting to try and build something like it for $100.

-Kaj
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Old 25th May 2001, 06:36 PM   #4
byu is offline byu  Canada
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This is a chinese DIY site based in Taiwan. They sell kits and PCB's. It's a writeup of the experience in building one of their IC amp kit.

Unless you want to build this kit, it's not very useful to understand what all the chinese words are about, if you really want to understand, email me, I can translate it for you.

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Old 25th May 2001, 07:28 PM   #5
mlloyd1 is offline mlloyd1  United States
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Anybody ever read Rod Elliot's views on the gaincard amp?
http://www.sound.au.com/madashell8.htm#gaincard
I must admit I never heard of this Gaincard amp until I saw mention on this board.

Michael
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