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Old 1st May 2009, 07:57 PM   #1061
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Thanks

Quote:
I don't see the protection relays...
I have decided not to use DC protection. But, I plan to put protection soon; something like that:

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Old 1st May 2009, 07:57 PM   #1062
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nice work pal, how much it cost you.
100$ (without transformer, and samples of 3886)
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Old 15th May 2009, 05:04 AM   #1063
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Default LM3875 kit from Audio Sector in server case

Thought I would post up my project. I joined this forum about a month ago when I found out about the Gainclone. After reading up on it I n decided to go out on a limb and build one. This was my first kit and in the end I am quite happy with it.

The reason the case is so huge is....
Needed it to fit in a rack
Had the case empty in my rack
Was planing to build two kits into the one case

In the end now that I have built it I am quite sure that for my needs it will be loud enough. I have read other people say it but I will have to say it again. This thing is very small but packs much more punch than I thought it was going to. I switched from a Alesis RA150, 75W per channel. The LM3875 chip with 24V rails into approx 6-8 Ohm speakers is easily as loud. And sounds MUCH MUCH better.

Ok so on with the pictures already

The raw server case
Click the image to open in full size.Click the image to open in full size.

The built boards

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Layout and mounted boards
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Putting it all in the box.
Here you see the transformer. I had this one custom wound by SumR . They are based out of Toronto ON. I have nothing but the best things to say about them. I was dealing with Richard himself and he was very helpfull and got this one to me in about two weeks. It is a fully insulated 300VA with dual 24V rails.
Click the image to open in full size.

This is the the AC input and switch. It is taken from a computer power supply for ease. Here also is the every so sexy speaker and RCA connections
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Here it is all put together. I think this thing is going to be called the Dirty Spider
Click the image to open in full size. Click the image to open in full size.
Click the image to open in full size.Click the image to open in full size.

Here it is all closed up and ready to get to work.
Click the image to open in full size.

When I did first turn it on I had the rare but know RF interference problem. I had to put a small capacitor across pins 7-8. It was somewhat tricky but not a big deal.
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Old 15th May 2009, 06:22 AM   #1064
wim is offline wim  Netherlands
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very nice work ~D'Evil~ SPb -, and not only the electronics. I see you make very good photo's also.

What kind of camera you use?
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Old 15th May 2009, 02:15 PM   #1065
troystg is online now troystg  United States
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Mike-

Everything looks good except that Romex!! Get rid of that and cut up the server power cord instead.

Funny how yours is the opposite of Peter's Patek chip amps.

That is prolly the best use of a PC case I have seen because when they are filled with PC parts and operational that means WORK.

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Old 15th May 2009, 03:37 PM   #1066
AndrewT is offline AndrewT  Scotland
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Default Line to Earth capacitor

What is that blue device between White and Green in post1063 pic7 from top?
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Old 15th May 2009, 03:47 PM   #1067
troystg is online now troystg  United States
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There are 2 caps on the incoming AC, you can BARELY see the lower. Help reduce HF noise on the line.


Mike- Forgot to mention, I LOVE that trafo! Where'd you get it and how much?
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Old 15th May 2009, 03:51 PM   #1068
AndrewT is offline AndrewT  Scotland
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if they are caps from Line to Earth, then I repeat the question:
what are the blue devices from White to Green and maybe from Black to Green?
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Old 15th May 2009, 04:58 PM   #1069
udailey is offline udailey  United States
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Andrew is right. Thats a bad idea to allow a cap between an AC line and ground. There are better ways to reduce noise. Try a simple ferrite toroid instead. Makes a big difference and is easy.
Uriah
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Old 15th May 2009, 05:50 PM   #1070
troystg is online now troystg  United States
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The power company have caps across the line and neutral right out side your house.

Equipment manufacturers have put caps across the mains in electronics for decades.

And the aftermarket sells caps to put across the AC in your home <Quiet lines> and across the speaker terminals to help eliminate RF and grunge in cables.

http://www.soundstage.com/revequip/db04.htm

http://www.psaudio.com/ps/products/d...ster?cat=power

Finally, had to look for this one...

http://www.walkeraudio.com/high_definition_links.htm
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