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Old 5th October 2013, 04:16 AM   #1
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Default New 4 layer LME49610 Headphone Amplifier D1

4 layer PCB The corner 1234 letter is printed on different layer to make sure the pcb manufacturer do not reverse the middle two layer arrangement in factory

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Many people blame against the distance of decouple distance, and yes, it do make a different. Total 4000uf panasonic low esr capacitor in 1MM (yes! 1MM decouple distance) see the pic with my component arrangement it should be the only way to fulfill the 2000V/μs slew rate and max. 750mA output current of lme49610 before trigger it's short circuit output protection

Testing with the Tchaikovsky 1812 overture, the cannon fire is much more real than ever before. For comparison, real world cannon fire can be heard in many festival.

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Gold plated headphone socket has much lower contact resistance, the sound output is much more clear, non-audiophiles can also hear the difference.

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This is only a prototype, please don't blame on the soldering quality
Any comment and suggestion are welcome

Last edited by diyinhk; 5th October 2013 at 06:33 AM.
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Old 3rd November 2013, 11:40 PM   #2
RNMarsh is offline RNMarsh  United States
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Is there a pcb available for your project... and schematic?
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Old 4th November 2013, 01:16 AM   #3
jcx is offline jcx  United States
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the awkward but easy solution to TRS connector single point contact high series R, channel crosstalk is to cut it off, rewire "balanced" - 4 wires in separated pair to each driver using low contact R multiple contact point pin/socket connectors
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Old 4th November 2013, 02:11 AM   #4
agdr is offline agdr  United States
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jcx - what is your favorite 4 pin for headphone use? mini 4-pin XLR? I think qusp went into some detail once about preferring a certain 4 pin Hirose over the mini XLR.
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Old 4th November 2013, 02:20 AM   #5
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qusp's recommendation was for Lemo 4-pin for balanced connections ... I think you'll find that's what EUVL and the xen-audio guys use too.
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Old 4th November 2013, 03:40 AM   #6
agdr is offline agdr  United States
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Thanks, I'll look the Lemo up.
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