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Topic: [RESOLVED] TDA2822 Audio Amp (Read 1 time) previous topic - next topic

bratan

Dec 29, 2012, 12:53 am Last Edit: Dec 29, 2012, 04:39 pm by bratan Reason: 1
Hi,

I've been trying to get sound out of TDA2822 (8 pins) for about 4 hours now, nothing I tried works. Is anyone familiar with this IC?  Only thing I don't have is 4.7 Ohm resistors, I tried 10 Ohm instead. Could this be the issue?
Schematic I'm using is from chip's Datasheet, it's Bridged (mono) version: http://www.unisonic.com.tw/datasheet/TDA2822.pdf
I did get some sound but it's cutting in and out and chip started to overheat at 5V... Any suggestions?
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No experience with this chip but double check your wiring :) You can put 2 10ohm resistors in parallel so you get a 5ohm resistance.
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dhenry

I would check wiring.

That chip is fool-prove so it is hard to not get it to work.


bratan


No experience with this chip but double check your wiring :) You can put 2 10ohm resistors in parallel so you get a 5ohm resistance.

Thanks for the info! I didn't realize I can divide resistance like this :)

I would check wiring.

That chip is fool-prove so it is hard to not get it to work.

Yup, will try it again. I'm also not sure why it doesn't work, schematic seems pretty straight forward... Thanks!
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db2db

Speaker hooked up to just 1 and 3?

bratan


Speaker hooked up to just 1 and 3?

Yes! Does polarity matter?
Btw it's .5 W 8 Ohm speaker
Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info :)

bratan

Got it working! I think parallel resistors helped :-)  One more question, how do I reduce amplification? I think its giving out 2 watts, while my speaker can only handle .5
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dhenry

Quote
how do I reduce amplification?


Have you tried to read the datasheet you linked to?

bratan


Quote
how do I reduce amplification?


Have you tried to read the datasheet you linked to?

I had read it. Didn't see relevant information, thus I'm asking
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retrolefty

Quote
Got it working! I think parallel resistors helped :-)  One more question, how do I reduce amplification? I think its giving out 2 watts, while my speaker can only handle .5


You reduce the input signal either with two voltage divider resistors or better yet just replace the input 10K ohm resistor and replace it with either a 10K pot or trimmer pot with the wiper feeding the input pin.

Lefty

bratan


Quote
Got it working! I think parallel resistors helped :-)  One more question, how do I reduce amplification? I think its giving out 2 watts, while my speaker can only handle .5


You reduce the input signal either with two voltage divider resistors or better yet just replace the input 10K ohm resistor and replace it with either a 10K pot or trimmer pot with the wiper feeding the input pin.

Lefty


Thanks, yeah that works!  I connected Pot and it reduces volume.  Now to figure out how to get rid of all the terrible digital noise I get from my circuit, but that's whole another story :)
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dhenry

Quote
Didn't see relevant information


Page 5, schematic diagram. Two resistors from OUTx to NFx. What do they do?

bratan


Quote
Didn't see relevant information


Page 5, schematic diagram. Two resistors from OUTx to NFx. What do they do?


No idea :)
Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info :)

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