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please advise.. ext. LPF summing differential outputs by an opamp
please advise.. ext. LPF summing differential outputs by an opamp
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Old 17th May 2006, 12:15 PM   #1
ASSaBeong is offline ASSaBeong  South Korea
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Join Date: May 2006
Default please advise.. ext. LPF summing differential outputs by an opamp

Hi

Please some advice...

pc soundcard -- AK4395 DAC board -- headphone amp -- headphone.

I want to modify analog low pass filter section connected to AK4395 DAC's output.

change opamp(2134 --> ad8620,opa627,lt1115,ad797,ad843...)
opa 2134 is operating as an analog low pass filter summing the 4395's differential outputs.

change power supply bypass caps
(general purpose 85' AL --> 105' low impedance AL cap)
(0.1uf mks --> 0.1uf mkp)

change the film cap, determining the cut frequency slope??
(2.2nF mks --> 2.2nF fkp, mkp or silver mica)

change output coupling cap??
( 47uF 85' general purpose AL, SMD type, --> ?? suggest!!! )

Please some advice.

Thank You.

analog part circuit is attached.
Attached Images
File Type: jpg analog_filter.jpg (41.4 KB, 132 views)
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