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Old 17th November 2007, 11:06 AM   #1
Dxvideo is offline Dxvideo  Turkey
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Lightbulb Another Class A headamp idea

Hi all,

Finally, I made some mods on my class A headphone amplifier with OPA134+IRF510...
Click the image to open in full size.
There are two differences between old and new versions,
First- I use a discrete class a op-amp instead of OPA134,
Second- I use an IC based CCS instead of power resistor.

I havent tested yet. However it worked fine on simulator. Except it seems I will some DC offset problems on ouput.

May you say something about that circuit pls?

Thx.
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Old 17th November 2007, 11:25 AM   #2
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Looks OK.
You can consider adding a resistor or ferrite bead at mosfet's gate.
To reduce offset you can manipulate R4/R8 ratio.
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Old 17th November 2007, 12:57 PM   #3
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There is no frequency compensation.
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Old 19th November 2007, 08:08 AM   #4
Dxvideo is offline Dxvideo  Turkey
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Now, DC offset and frequency compensation problems seem fixed;
Click the image to open in full size.
Do you think its ok?
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