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Chip Amps Amplifiers based on integrated circuits

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Old 11th December 2012, 07:32 PM   #11
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by d1030180 View Post
I have tested the TDA2822M amp chip in both stereo and mono (bridged) operating modes, but I soon became really put off by the amount of static background noise it produces. We find it unbearable even for this kind of miniature laptop sound system. After applying power to the circuit without any input (but cable connected), the sound from the speaker(s) is like somebody just turned on a fan.
Both configurations (stereo/mono) exhibit this behavior and it seems like I have to choose another amplifer IC to be used in this project...
That is definitely not the fault of the TDA2822.

There could be many reasons why... and without seeing the construction/layout etc and putting a scope on it I wouldn't want to guess but the TDA2822 isn't the fault.
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Old 8th January 2013, 07:08 PM   #12
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Haven't checked my thread in a while. Thanks for your replies.

I have built a stereo amplifier with an amplifier chip (AN7522) from an old car radio. I followed the schematic on the datasheet. The amplifier uses a 12VAC wall cube as a power supply and it has an LM317 voltage regulator IC with additional transistor.

The heat sink is originally from a broken car audio amplifier and it's clearly too big. I might change it to a smaller one to save some space.
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File Type: jpg imgp3314.jpg (798.1 KB, 89 views)

Last edited by d1030180; 8th January 2013 at 07:08 PM. Reason: typo
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Old 8th January 2013, 07:19 PM   #13
Mooly is offline Mooly  United Kingdom
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Neat job
Thanks for the update.
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Old 8th January 2013, 08:27 PM   #14
JMFahey is offline JMFahey  Argentina
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Nice job, congratulations.
The heatsink is not that large, it's PCB size.
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Old 9th January 2013, 01:26 PM   #15
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Very very good work!

I love the use of LM317 and a transistor in the voltage regulation stage.

Could you please post your circuit of that regulation stage?
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Old 9th January 2013, 02:17 PM   #16
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With Vcc=12V, the heat sink need only be 23 C/W
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Old 15th January 2013, 05:24 PM   #17
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Originally Posted by csom View Post
Very very good work!

I love the use of LM317 and a transistor in the voltage regulation stage.

Could you please post your circuit of that regulation stage?
This is the schematic I used for the regulator.
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