IFR513 headphone amp channel mismatch - diyAudio
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Old 19th May 2009, 08:31 PM   #1
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Join Date: May 2008
Default IFR513 headphone amp channel mismatch


I have a headphone amp based on the IFR513 MOSFET which has a noticeable volume difference between the L + R channel outputs. All the resistors have been checked and measured to ensure a close match. All things being equal, could one or both of the MOSFET's be at fault?

Also, do MOSFET's of the same type differ greatly in output?


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Old 20th May 2009, 03:10 PM   #2
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Join Date: May 2008
Any ideas?

I have the amp in bits at the moment (re-wiring the passive pre side of it). Is it worth ordering some more MOSFETS, or would it be worth adding trim pots in the bias cct?

Many thanks,

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