Inverted composite headphone amp schem

shark70 · 25th March 2010, 11:55 PM

My headphone amp sounds really nice...

kuldeepsingh · 26th March 2010, 05:01 AM

can you post pic of the build.

stratus46 · 26th March 2010, 05:17 AM

Quote:

Originally Posted by shark70

My headphone amp sounds really nice...

AD811s have blistering speed and lots of output current capacity. I used them for video amplifiers in High Definition film to video gear. You can run them non-inverting but you can never treat tham as voltage feedback amplifiers as they always need a feedback resistor to control the response. I've never tried them for audio but I don't doubt your results. I can't imagine you having any slewing induced distortion issues with 2500 V / uS !

G²

mlloyd1 · 26th March 2010, 05:53 AM

looks good. in spite of it's age, i still like the ad811 also.
hope you've got a heat sink on him, running at 15 volts

they idle hot.
depending on your headphones, you can reduce the value of the output resistor too.
my headphones are low impedance and sound better with an output resistor between 30 to 60 ohms.

mlloyd1

shark70 · 26th March 2010, 01:37 PM

No build yet still in breadboard,still tweaking it at moment will post final schem when finished.I'm going to use the lme49713ha CFB opamp in place of ad811 CFB opamp its supposed to sound better.Ye needs little heatsink on ad811 when running at +-15v.Its an inverted Walt Jung composite opamp line driver.Lots of good info on Walts site Home

shark70 · 26th March 2010, 11:33 PM

Here's the latest with a few tweaks..

26th March 2010, 05:01 AM	#2
kuldeepsingh diyAudio Member Join Date: Aug 2006 Location: Chennai, India	can you post pic of the build. __________________ . . .. ... ..... ........ ............. ..................... .................................. My Best LM3886 PCB layout

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26th March 2010, 05:53 AM	#4
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	looks good. in spite of it's age, i still like the ad811 also. hope you've got a heat sink on him, running at 15 volts they idle hot. depending on your headphones, you can reduce the value of the output resistor too. my headphones are low impedance and sound better with an output resistor between 30 to 60 ohms. mlloyd1

26th March 2010, 01:37 PM	#5
shark70 diyAudio Member Join Date: Nov 2009	No build yet still in breadboard,still tweaking it at moment will post final schem when finished.I'm going to use the lme49713ha CFB opamp in place of ad811 CFB opamp its supposed to sound better.Ye needs little heatsink on ad811 when running at +-15v.Its an inverted Walt Jung composite opamp line driver.Lots of good info on Walts site Home

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