From: John Woodgate
Subject: Re: Cheap 'n' nasty subwoofer amplifier
Date: Fri, 29 Nov 2002 06:12:35 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 29 Nov 2002 08:38:11 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Al Borowski wrote (in <email@example.com>)
about 'Cheap 'n' nasty subwoofer amplifier', on Thu, 28 Nov 2002:
>"Dave VanHorn" wrote in message news:A@comcast.com>...
>> > You should also be concerned about voltage, for 100W into 4 Ohms you
>> > need +/- 28 Volts output swing which is quite a lot for an op amp.
>> The LM-12 opamp will handle this quite nicely.
>so voltage issues aside, do you think I could make a decent amp using
>a single op amp, a few transistors and a handful of passives? I've
>often wondered why deisgns on the web generally don't use op amps.
The LM12 will perhaps do the job, but it's COSTLY. You could buy six
TDA1514s for the same price, and it IS an op-amp (pins 1 and 9 are the
differential inputs) specialised for audio applications.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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