Pages: [1]   Go Down
Author Topic: [RESOLVED] TDA2822 Audio Amp  (Read 1214 times)
0 Members and 1 Guest are viewing this topic.
New York
Offline Offline
Sr. Member
****
Karma: 4
Posts: 376
xronosclock.com
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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?
« Last Edit: December 29, 2012, 10:39:24 am by bratan » Logged

Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info smiley

Belgium
Offline Offline
Sr. Member
****
Karma: 1
Posts: 281
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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


Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I would check wiring.

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

Logged

New York
Offline Offline
Sr. Member
****
Karma: 4
Posts: 376
xronosclock.com
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

No experience with this chip but double check your wiring smiley 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 smiley
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!
Logged

Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info smiley

Offline Offline
Full Member
***
Karma: 0
Posts: 222
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Speaker hooked up to just 1 and 3?
Logged

New York
Offline Offline
Sr. Member
****
Karma: 4
Posts: 376
xronosclock.com
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Speaker hooked up to just 1 and 3?
Yes! Does polarity matter?
Btw it's .5 W 8 Ohm speaker
Logged

Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info smiley

New York
Offline Offline
Sr. Member
****
Karma: 4
Posts: 376
xronosclock.com
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info smiley

Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
how do I reduce amplification?

Have you tried to read the datasheet you linked to?
Logged

New York
Offline Offline
Sr. Member
****
Karma: 4
Posts: 376
xronosclock.com
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info smiley

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17301
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

New York
Offline Offline
Sr. Member
****
Karma: 4
Posts: 376
xronosclock.com
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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 smiley
Logged

Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info smiley

Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Didn't see relevant information

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

New York
Offline Offline
Sr. Member
****
Karma: 4
Posts: 376
xronosclock.com
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Didn't see relevant information

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

No idea smiley
Logged

Xronos Clock - A talking arduino based alarm clock is now available. Check out xronosclock.com for pictures, source code, schematics, and purchasing info smiley

Pages: [1]   Go Up
Jump to: