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Old 26th March 2006, 12:14 AM   #1
creyc is offline creyc  United States
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Default Amp plans/kit? around 200W

I'm looking for a great PCB and plans for building a high quality amp. I can do two mono-blocks or a single stereo amp, but I need around 200 watts per channel, minimum. Quality is very important to me, so discreet transistors seems like it should still be the best way to go I'm thinking. These things should be very reliable (for parties and such) and I pan on using the highest quality parts I can get.

In all I'll be building 4 of these, and have a great source already for custom fabricated aluminum cases. I need to find a good solid design, preferably from someone already selling PCB's that are known for their quality. I apologize for my relatively limited knowledge of the amp game, I come from the headphone world so while I have experience building amps, none of them put out anything above a few hundred milliwatts.
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Old 26th March 2006, 07:27 AM   #2
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Have a look at my web site

I am just about to release a new design NX150
I have some other great designs there as well.
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Old 26th March 2006, 07:49 AM   #3
creyc is offline creyc  United States
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Cool, I've found a few designs around here even higher powered, like the Studio 350, AV400 and Leach Superamp. How do these amps compare from a sound perspective and also cost or ease of building for a relative newcomer to the amp DIY scene?

The saint, I'm checking those out now.
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Old 26th March 2006, 08:13 AM   #4
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Hi creyc

Well The AV400 Is my design and the sound quality is very good indeed...

and its easy to construct and get going.
Many hundreds have been built and enjoyed....

Anyway have look any questions just let me know....
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Old 26th March 2006, 08:16 AM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
have a look at Jens' 5pair Leach clone.
a 2 *45Vac supply should give around 200W and be capable of driving 4ohms to about 350W with an appropriately beefy supply.
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Old 26th March 2006, 09:48 AM   #6
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Quote:
Originally posted by The Saint
Hi creyc

Well The AV400 Is my design and the sound quality is very good indeed...

and its easy to construct and get going.
Many hundreds have been built and enjoyed....

Anyway have look any questions just let me know....
Tried to have a look, but the site doesn't work?.

All the button graphics are missing, and there's no links where they should be?.

I notice it's written using Frontpage 4.0, presumably using a 'wizard'? - does it need to be running on a Windows server?, or at least a server with Frontpage extensions?.
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Old 26th March 2006, 09:53 AM   #7
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Quote:
Tried to have a look, but the site doesn't work?.
Works OK here
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Old 26th March 2006, 09:58 AM   #8
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Try loading java runtime from here

www.java.com

I will be changing the buttons from java to something much
simpler so we won't have this problem anymore.
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Old 26th March 2006, 05:48 PM   #9
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IMO, if you want high quality, back off on your power requirements a bit.
The less output power, the easier it is on internal circuitry and usually this results in higher sound quality.
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Old 27th March 2006, 12:51 AM   #10
AKSA is offline AKSA  Australia
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I think Myh is probably right, although Anthony's amps are robust and do sound very clean.

I have two kits; a 55W and a 100W8R/200W4R, and I believe an even more powerful amp would not sound quite so good because of output pair mismatches.

200W into 8R requires at least three output pairs, and preferably four, to meet SOAR requirements. Getting all three/four devices to turn on and off together in perfect unison is tricky, particularly at very low listening levels.

Cheers,

Hugh
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