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Old 16th August 2003, 09:42 AM   #1
postman is offline postman  Australia
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Default New amp suggestion

Im pretty new to these forums, so go easy on me

Basically i just finished making my new speakers, and ive now realised that my ht amp is really bad for music and cant really power these speakers properly.

So i need some suggestions on a 2channel amp that i could construct. The speakers ive made can take upto about 200rms into them, so i guess a pretty powerful amp would be needed to stop it from clipping at loud volume ?

Im fairly good with soldering etc so construction should be too hard, im just not too good on the theory or planning side of the amp.

I had 5 LM4651's lying around in my workshop somewhere, and i was wondering if they could be incorperated into the amp.

http://www.national.com/pf/LM/LM4651.html

Thanks
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Old 16th August 2003, 10:12 AM   #2
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I like this one....its super simple. Plus you can get the chips for free from national. Well maybe it depends on your Email address. i tried my juno acount and they wanted to charge me, but then I tried my TI email and they said sure no problem...24 hours later 4 free LM3886's.


Go to National Semiconductorand see what they can do for you
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Old 16th August 2003, 10:30 AM   #3
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Getting stuff from national is no problem, done it a few times before for other components.

Ive heard these gainclones are pretty good, but somewhere in that thread it said something about 10wattsrms only, would that be sufficient to be able to drive my speakers rather loudly and not ruin/clip the amp ?
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Old 16th August 2003, 10:43 AM   #4
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Quote:
Originally posted by postman
[B]Ive heard these gainclones are pretty good, but somewhere in that thread it said something about 10wattsrms only /B]
Nahhhh. Well, it depends on how many volts you supply them with really. The other day on an LM3875 I measured a shade over 44 watts into 8 ohms with power supply rails of +/- 28 volts under load. National rate them as 56 watts but I think this is at +/- 33 volts or so.

You will probably find the difference between say 50 and 200 watts not as big as you expect. You can hear it, but it's not a super-big deal.
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Old 16th August 2003, 11:00 AM   #5
postman is offline postman  Australia
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Yeh i realise there wouldnt be that much of a different in loudness, but i guess having a 200watt amp would be on much less strain then a 50 watt amp, you know what i mean ?

Anyways i might give that amp a go if other people dont have any better suggestions.
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