tda2052

MaXiZ · 9th July 2005, 06:59 PM

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?

jaudio · 9th July 2005, 08:25 PM

Make sure c3 is connected properly(double check the polarity) and connected to Neg rail supply not ground.

MaXiZ · 9th July 2005, 10:49 PM

Are the red polarity correct?
And if it's alway connected to negative it's always in stand by....

jaudio · 10th July 2005, 12:40 AM

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.

MaXiZ · 10th July 2005, 08:11 AM

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..

jaudio · 10th July 2005, 10:23 AM

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

MaXiZ · 10th July 2005, 11:47 AM

all checked and all seems to be ok...
TDA is NEW!

jaudio · 10th July 2005, 07:57 PM

Check resistance at pins 2 and 3

MaXiZ · 11th July 2005, 07:40 AM

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?

jaudio · 11th July 2005, 09:52 AM

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?

9th July 2005, 06:59 PM	#1
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	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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9th July 2005, 08:25 PM	#2
jaudio diyAudio Member Join Date: Oct 2004	Make sure c3 is connected properly(double check the polarity) and connected to Neg rail supply not ground.

10th July 2005, 10:23 AM	#6
jaudio diyAudio Member Join Date: Oct 2004	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

11th July 2005, 07:40 AM	#9
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	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?

11th July 2005, 09:52 AM	#10
jaudio diyAudio Member Join Date: Oct 2004	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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