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Old 8th August 2004, 09:45 AM   #1
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Default Opa541-548-549

Hi guys, one of my friends have send me over some OPA541, OPA548 and OPA549 dozen each andI though I might wanna build some sub amps with em.
Heres what I want to do:
1) A sub amp for car using OPA548 in single supply mode a parallel application may be:
2) A sub amp for home use using OPA549 dual supply mode a parallel application.
3) Rest of the chips to be used as satellites and front speaker.
Does any one have made such applications, I ll appreciate if anyone posts his schematics here I ll make the layouts myself.
Thanking in Advance.
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Old 8th August 2004, 10:12 AM   #2
kinser is offline kinser  Israel
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Abdir,
I found this web site on google image search and found some schematics for the OPA541
I hope this helps you:
http://www.freewebs.com/matttcatttweb/audio.htm

Kinser
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Old 8th August 2004, 02:51 PM   #3
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Kinser Thanks, website is of help as far as building a sub using OPA541 in dual supply mode, now for the second part where I wanna build sub for car using OPA548 in single supply parralel mode, I look forward to "DIYers" for help.
Also any suggestions building sub using OPA549 parallel mode having OPamp filters third order maybe at the input stage will be welcome.
Rehan
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Old 9th August 2004, 07:06 AM   #4
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read the app notes at www.national.com
search for lm3886 and look at the high power apps. most of the advice still applies.

when using 2 ICs, you should take steps to match the outputs -- gain and dc offset. for a single supply this shouldn't be hard -- tie the amps together after the output caps. i'd still run a 0.1 or 0.2 ohm resistor in series with the output to prevent one IC from suppling more current.
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