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LM3886 x 2 in parallel power amplifier

http://www.shine7.com/audio/pa100.htm

GainClone Amps DIY LinksGC WebRingfedde's GCDecibel DungeonGainClone forumMore Audio Links

This amp is ased on !he "A#$$ parallel amplifier de!ailed in %a!ional&emi'ondu'!or(s appli'a!ion no!e ) A%##*2+

This amp uses !wo LM3886 per 'hannel, in parallel 'ir'ui!+ This amp 'andeli-er aou! .$/ in!o a 8)ohm speaker and #$$/ in!o a 0)ohmspeaker+

Can a 'hip amp sound 1ood Defini!el4 5eff owland uses LM3886 insome of !heir desi1ns, and !he re'ei-ed 1ood re-iews+

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8/13/2019 LM3886 x 2 in Parallel Power Amplifier

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&'hema!i's 7

The "C laou! is done usin1 "ower"C .+$+ I !hink i! is a powerfullaou! sof!ware+

"C Laou! 9!op:7

8/13/2019 LM3886 x 2 in Parallel Power Amplifier

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"C Laou! 9o!!om:7

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Af!er finished !he laou!, I send i! !o a "C manufa'!urer in ;< !o make!he "C+ Makin1 "C is 'heap in ;

8/13/2019 LM3886 x 2 in Parallel Power Amplifier

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The /IMA $+#u? suppl de'ouplin1 'apa'i!ors are soldered dire'!l on!he pins of LM3886+ This helped !o remo-e some hi1h freuen'noise+

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The 3886 are moun!ed on a 38 in'h alumimum pla!e !hen !o !he 'ase+Eu!side of !he 'ase I used 3 "C C"= hea!sinks+ I used Ar'!i' &il-er!hermal 'ompound e!ween !he alumimum laers !o impro-e hea!'ondu'!i-i!+

/i!h all !hese i1 hea!sinks, i! onl 1e! sli1h!l warm when lis!en a!normal -olume+

8/13/2019 LM3886 x 2 in Parallel Power Amplifier

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%o!e !ha! !he 68$ ohm and 0$p? fil!er is ins!alled a! !he CA+ This help

fil!erin1 !he ;? noise efore i! 1e!s on!o !he oard+

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Transformer used here is a .$$@A 2x 2.@+ The power suppl is !hen

re1ula!ed 2 LT#$83, af!er !he re1ula!ion, !he -ol!a1e is 3$@+

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"ower suppl and re1ula!or s'hema!i' 7

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/ill 'onsider !o use !his suppl 'ir'ui! ins!ead, !he TI"2*.. is 'apale ofpro-idin1 #.A of 'urren!7

I did some DC measuremen! and !he resul! is ui!e 1ood, I 1o! m@ of

DC offse! a! !he speaker !erminal+ The -ol!a1e differen'e e!ween !heou!pu! of !he 2 'hips is less !hen # m@+The sound of !his amp is similar !o m LM38. amp, whi'h is -er 'lean

and de!ail+ I! has no hum, no hiss and no noise+ Compared !o !heLM38. GC, !his amp 'an deli-er !wi'e !he