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Old 9th July 2005, 07:59 PM   #1
MaXiZ is offline MaXiZ  Italy
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Default tda2052

I've build the suggested schematic on pdf file of datasheet.
But i've the following trouble...
1) Turn on my PSU +/-24V
2) All wire connected (input/output)
The trouble is here...
I give +5v at pin3 and for a second it seems to give the right power to the speaker and immediactly after it goes at lower volume with a little tendency to give high frequency as output...
I hope to have be clear....
Some suggestions?
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Old 9th July 2005, 09:25 PM   #2
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Make sure c3 is connected properly(double check the polarity) and connected to Neg rail supply not ground.
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Old 9th July 2005, 11:49 PM   #3
MaXiZ is offline MaXiZ  Italy
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Are the red polarity correct?
And if it's alway connected to negative it's always in stand by....
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Old 10th July 2005, 01:40 AM   #4
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Quote:
Originally posted by MaXiZ
Are the red polarity correct?
Yes

Quote:
Originally posted by MaXiZ
And if it's alway connected to negative it's always in stand by....
Do you have (-) of C3 connected to neg rail supply?

What is the voltage of your transformer? You may have to lower the supply voltage.
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Old 10th July 2005, 09:11 AM   #5
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Quote:
Do you have (-) of C3 connected to neg rail supply?
absolutely yes!
Quote:
What is the voltage of your transformer?
THe original output is around +/-40v but with this (http://sound.westhost.com/project102.htm) i take it down to exactly +/v24..
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Old 10th July 2005, 11:23 AM   #6
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It is likely to be something simple. Lets start eliminating possible problems.


1 make sure all cap are connected properly(polarity)

2 check all ground wiring

3 measure resistance at pins(between pin and ground)

4 C1 bewteen R1 and pin 7(not R1 and ground)

5 measure at pins 5and 7 : bewteen pins 1 and 6 and bewteen 1 and the (+) of C2
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Old 10th July 2005, 12:47 PM   #7
MaXiZ is offline MaXiZ  Italy
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all checked and all seems to be ok...
TDA is NEW!
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Old 10th July 2005, 08:57 PM   #8
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Check resistance at pins 2 and 3
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Old 11th July 2005, 08:40 AM   #9
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Excuse me..
But pin 2 should be connected directly to +V and pin 3 is for play/stand by (by a 22k resistor) and when i want PLAY i make a short to +v right?
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Old 11th July 2005, 10:52 AM   #10
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Dont connected any. Only check the resistance bewteen the pins,You know what the resistance should be.

I looked at the picture you posted everything seem OK. The only thing I see that maybe a fault is a possible connection bewteen pin2 and 3(look inside the square).


Have you built more than one?.
You make just have a bad chip. It happens.

Were is the +5V for pin 3 coming from?
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