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The Audio Amplifier Circuit I Assembled
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Author:  balcony [ 26 May 2017, 01:52 ]
Post subject:  The Audio Amplifier Circuit I Assembled

Good day, :headphones:
I would like to ask about an amplifier circuit I assembled today.
I used the TDA2822 which from STMicroelectronic,8 pins stereo circuit as in the datasheet ( http://www.kynix.com/uploadfiles/pdf9675/TDA2822.pdf ) and connected it to two 1 inch 8 ohm speakers, and a 3.6v lithium battery and connected it to my PC/Mobile.
But the sound is very loud and noisy when I turn down the stereo potentiometer (It works fine only on the highest resistance value) , so is it the 10k potentiometer (should I use 100K?) or is it lack of voltage? and if so should I use another amp. circuit that works better with 3.6v battery and what do suggest? or is it something else like capacitors (I used 1000uF instead of 470)
Best wishes~

Author:  laurie54 [ 19 Feb 2018, 15:21 ]
Post subject:  Re: The Audio Amplifier Circuit I Assembled

You must put in the series capacitors before the volume pot. This will stop the DC from getting into the next stage which is your amp. If you have left them out it will do as you suggest.
If you scroll down a bit in the data sheet and have a look at the bigger sch which shows your amp connected to a pre-amp. There you can see and get the values for the caps.

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