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Old 7th August 2007, 08:56 AM   #1
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Unhappy Please help me debug my Headphone Amplifier

Attached is the schematic I used.

My problem are:

1. Hissing with or without input signal.
2. Clicking when I turn the input signal's volume to 0.

Thanks.
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File Type: jpg tda2822 schematics.jpg (23.9 KB, 246 views)
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Old 7th August 2007, 09:33 AM   #2
Dxvideo is offline Dxvideo  Turkey
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Hi,
Hissing may be from the source. Do you use PCB or a test board. You may check the signal path if its too long...
Adiditonally if you hear some 100Hz noise then that means you have a ground loop. Yhen you must check your GND connections.
And your "click" noise comes from a bad GND connection.
However, I afraid TBA2822 is not a suitable IC for headphone applications. Its not HI-FI, it has a fixed gain which you will never need with headphones.
TDA1038 is a better alternative for that application. But I dont know if its still available or not.
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Old 7th August 2007, 10:15 AM   #3
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The amp is totally wrong for this. The gain is 100 but 2-4 is more what you'll need so noise is what you'll here! Use an opamp instead, maybe with an output buffer. Check my QRV02 for inspiration.
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Old 7th August 2007, 11:06 AM   #4
Dxvideo is offline Dxvideo  Turkey
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Or you may have a look my last SE headphone amplifier. Which I currently use..
DC Offset on Class A headphone amp.
Its sound is fantastic.
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Old 8th August 2007, 09:00 AM   #5
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Thanks guys.

I found my fault. Since I am prototyping, this is my second attempt actually, I failed to use separate grounding for the input. I fixed it and it is now working noice free. I also added 100 Ohm in series with my headphone so to avoid clipping.

You guys are right. TDA2822 is not for the job. It is better than my first prototype based on LM386. But both can't deliver hi quality sound.

I will work on my next prototype and I will consider your seggestions here.

Thanks.
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Old 8th August 2007, 09:07 AM   #6
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Guys,

I've checked your suggestion. The design is awesome, but they are not portable. I need an Amplifier that can be powered by battery to be mobile. I will be using it to power my Sennheiser HD-201 and the source will be my iPod.

Thanks.
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Old 8th August 2007, 04:22 PM   #7
jcx is offline jcx  United States
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looking at other successful projects might help:

http://headwize.com/projects/index.htm

http://tangentsoft.net/audio/
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Old 10th August 2007, 02:22 AM   #8
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Hi,

It's a OPA2227 based amp. I would love to do it but I can't find that chip here in the Philippines.



Quote:
Originally posted by jcx
looking at other successful projects might help:

http://headwize.com/projects/index.htm

http://tangentsoft.net/audio/
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