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Old 21st January 2002, 08:27 AM   #1
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Default Simple Amp

Hi,
I'm new to audio electronics, and I am looking for a very simple power amp design, preferably with a chip-design, and not something complicated containing a lot of mosfets of transistors.

Doesn't have to be single-chip, can very well be briged, only I don't now how to bridge a non balanced amp.

Until now I have not found a amp-chip rated higher then about 80W, thats the LM3886, but I would like to build an amp rated higher then 500 W.


Since this is my first amp-project, any suggestions are very welcome.

Best Regards,
Christian V
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Old 21st January 2002, 08:38 AM   #2
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If you want that kind of power from chip amps, there are only a couple of options....

Have a look @ www.tripath.com for one possible choice.
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Old 21st January 2002, 11:40 AM   #3
Dirk is offline Dirk  Belgium
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If you are completely new to amplifier building and DIY electronics in general, I would recommend something smaller than an amp rated over 500W. Voltages and currents involved are so high that you risk blowing up your investments (which are considerable for such a big amp) in microseconds.

Usually, chip amps do not come in very high power since only one device has to dissipate all the heat.

Regards,

Dirk
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Old 21st January 2002, 01:15 PM   #4
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If you're sure to build an amp of 500W as your first project; have a look at my previous thread, there's a link to the schematic and you can download the pcb too:


500W

Or, if you're patient enough I'm designing one at myself too, but I can't tell you when it's finished, tested and modified properly.

>> to Dirk: nice to meet someone here from Belgium too!!!

best regards,

Hugobross.
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Old 21st January 2002, 01:26 PM   #5
paulb is offline paulb  Canada
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Another problem with chip amps is that they oscillate easily. Especially since this is your first amp project, I too recommend starting with something smaller. You'll learn a LOT on the first one.
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Old 21st January 2002, 01:39 PM   #6
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A 500watt amp, that's simple? Ha ha, that's a good one. Not to be rude, but why not build an amp that sounds good, and not just for show-off?
That was kinda rude, but really, why do you want that much power? There are so many great simple amps out there but none with the power u mentioned. It's a shame to limit your options because of a rather ridiculous criteria.
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Old 21st January 2002, 02:03 PM   #7
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now i've got a little more time to write a reply I too will agree that while making a high power chip based amp is doable, there are many good reasons not to do it...... in no particular order........

1) 500W is a lot of power ... unless this is PA you absolutely dont need it

2) unless you have the right equipment, troubleshooting will be near impossible as osscillations usually occur @ very high frequencies in these amps...

3) quality is without a doubt better than quantity..... there are a number of simple projects or kits available that should pose little problem to the beginner...
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Old 21st January 2002, 05:05 PM   #8
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Thanks for the pointers, I think I'll go with less output power.

I have done some experimenting with the LM3886 chip, but never put it together into an amp.

If there is anyone wo knows how to easily bridge this chip, I would be more than thankful. The schematic I use can be seen here http://www.fortunecity.com/tinpan/in...47/lm3886.html

I do not have a balanced input signal, so is it even possible?

Best Regards,
Christian V
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Old 21st January 2002, 05:14 PM   #9
SteveG is offline SteveG  United States
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Christian,
National has an application note on their web site for the 3886 (search for BPA-200) that tells you how to use multiple chips in bridge and parallel modes to get 200 watts out of them. I would attach it, but it's too big.
I am with the others though... I think that it's best to start simple. It will probably sound better too. Try a Zen or something.
Steve
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Old 21st January 2002, 05:27 PM   #10
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There are a number around, but this is the most thorough explanation of the issues I have seen:

http://www.national.com/appinfo/audi...ation_Note.pdf

It is also a scalable design.

Jamie

(It's also the one Steve refers to above)
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