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From: John Woodgate
Subject: Re: 40W bridge audio amp + signal-level crossover
Date: Mon, 9 Sep 2002 22:47:11 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 9 Sep 2002 22:33:32 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Nico Coesel
wrote (in <firstname.lastname@example.org>)
about '40W bridge audio amp + signal-level crossover', on Mon, 9 Sep
>Paul Evans wrote:
>>I require a circuit diagram / ideas to drive 40W(rms) into 8ohms. Ideally
>>a bridge amp to reduce power supply requirements, but as I'm building the
>>power supply as well, I can do split-rail to moderate (30v?) voltages.
>>Perhaps MOSFET..? Or maybe one of those all-in-one amplifier chips..?
>I'm working on an active subwoofer. I've looked into several amplifier
>circuits but I found it's much easier to use a chip; I choose the
>LM4766 from National. This is a dual power amplifier. In bridge
>configuration it should be capable of driving nearly 100W into 8 Ohm.
Some audio amp chips are very good indeed IF you stick to the
recommended PC board layout.
BUT don't mix chips using dual power supplies and chips using single
supplies in the same multichannel amp. To eliminate distorted crosstalk,
you need **microhm** ground path impedances. It's bad enough with just
two single-supply chips for POBS (plain old boring stereo).
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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