TDA2822 headphone amp - question about voltage - diyAudio
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Old 18th March 2011, 08:55 PM   #1
maurycy is offline maurycy  United States
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Default TDA2822 headphone amp - question about voltage

I have small amp built based on TDA2822 (schematic). Would it be better to run it on 2xAA or 1x9V? My headphones are AKG with 600 Ohms impedance. I am not really concerned on what would give me longer run time but more concerned what would be the correct voltage to run if used as headphone amp as it takes less time to charge AA than 9V.

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Old 18th March 2011, 10:00 PM   #2
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I would go for 9V battery.
2xAA reachrgeable will get you 2*1.2 volts, that is somewhere 2.4 volts.
and You need 3 volts minimum to get it going.

Even so, if the amp could manage to get that 3 volts as output, with a 600 ohm headphone it may not even be enough for anything.
0,015 watt, I em not a headphone user, but that seems a bit low for anything i might think of.

So i would go for the 9V solution.
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Old 18th March 2011, 11:33 PM   #3
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If the 'phones were 32 ohms i would have used 3 AAAs. In any case not 2. For 600 ohms, 9v all the way. Be aware that the 2822 isn't stellar - it works and it's almost impossible to damage, but that's about it.
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Old 19th March 2011, 03:27 AM   #4
maurycy is offline maurycy  United States
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Thanks for replies. I will go with 9V battery then. In my case it is even better because I already have an enclosure with support for 9V battery. As to the performance of the 2822, I am not too concerned about it because it will be used to amplify signal of my electric guitar for some late night practice. No need for the hi-fi sound.
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