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Old 25th May 2005, 06:35 PM   #1
SteveT is offline SteveT  United Kingdom
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Question Which amp to build????

I am going to build a chip amp but cant decide which design to go for. I want something that could drive Sub and full range speakers of various loads.
Electronics theory is not my strong point, but I can build most things with instructions.
SO.
Basically what I want is a well documented, indestructable, proven design that can output in excess of 100w.

ANY recomendations would be welcomed

Cheers

Steve T

Did I say it has to be cheap?
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Old 25th May 2005, 07:06 PM   #2
wxn is offline wxn  Lithuania
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You need LM3886/LM4780 in parallel (up to 100W) or bridged/parallel (>200W)
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Old 25th May 2005, 08:45 PM   #3
Nuuk is offline Nuuk  United Kingdom
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Same advice I always give to these questions. Start with a simple GC and then build a high-powered one when you have some experience. There are a few tried and tested designs on my web site.
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Old 25th May 2005, 11:30 PM   #4
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maybe this would be up your alley?

http://www.chipamp.com/lm4780.shtml
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Old 26th May 2005, 09:19 AM   #5
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If you have boxes with impedances never go below 8 Ohms, you can try the bridged version of the lm4780 (or two separate lm3886).

This guy: http://tech-diy.com/LM4780_bridgedamp.htm
has a perfect pcb.

unfortunately it seems to be a little difficult to buy some lm4780 - they are out of stock in many shops an will be there in one ore two month...
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Old 26th May 2005, 09:51 AM   #6
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I'm with Nuuk on this... build a simple one 1st. 25-35 W. Then if you need more power build another and bi-amp. Most of the cost is in the power transformer...

In a bi-amp situation 2 25 W amps is approximately equivalent to a 100 W amp (& the system usually sounds better)

There is a general rule of thumb... smaller amps tend to sound better.

dave
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Old 26th May 2005, 11:33 AM   #7
matjans is offline matjans  Netherlands
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i concur...

if i were you i'd build a lm3886 based amplifier (kit available from www.chipamp.com link above), a tried and tested design. It has more power than a lm3875 and is said to sound ~the same.

If that's not enough poof, biamp.
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Old 26th May 2005, 11:55 AM   #8
SteveT is offline SteveT  United Kingdom
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Thanks Guys.
I will check out the links and have a good think.
Although this is my first amp, it is not by any means my first electronics project. I dont really want a kit, as I like to make my own boards. but yes I have to agree that starting small is probably the sensible thing to do.
But then again who wants to be sensible?

Thanks again.

Steve T
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Old 26th May 2005, 01:21 PM   #9
Nuuk is offline Nuuk  United Kingdom
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Quote:
But then again who wants to be sensible?
I know what you mean Steve. When I don't want to be sensible there is a friend that I go and see

Click the image to open in full size.
but when it comes to electricity, I don't bring her home with me!
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