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Old 6th September 2010, 10:03 AM   #21
pra3718 is offline pra3718  India
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I correctly understood about tda7292. If you have tda7265 pcb layout with mute functioning please post.
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Old 7th September 2010, 03:00 AM   #22
aditya is offline aditya  India
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i will post it , the layout later in the evening i late to work tright now. hmmm secondly i havent used the mute pin as i didnt need it. but if kept floating it works fine, i m using it like htat since a few years with out a blow up.
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Old 7th September 2010, 10:47 AM   #23
pra3718 is offline pra3718  India
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NO MY AMP IS NOT WORKING/SOUNDING

How I completed my job : Gain Resistor (22+1) Power Supply 18-0-18 Split Supply. My audio source is CD Player.

1) When the Power switch ON, speaker starts continues humming. But amp sounding very very poor with humming/distortion. I Checked properly and found Pin 1 (-) Supply not connected to Pin 6. Power switch OFF & Pin 1 connected to Pin 6.

2) Again Power switch ON, Amp is like dead. I Checked again all & found no mistakes. DC was present at Pin 1 & 3 etc., Audio source was present in input Pin 7. No nothing Amp was not respond any way. I thought mute function was not working properly and I removed all required component from Pin 5 and make Pin 5 flotting/Not connected mode. No still amp was like dead. Power switch OFF

3) Again I disconnect Pin 6 from Pin 1, speaker starts continues humming. etc.,

Please help me what is my mistake.

Thanks & Best Regards.
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Old 7th September 2010, 01:07 PM   #24
aditya is offline aditya  India
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i dont know what your board is like , post the track side here for a look, thn it will be easy to say whats wrong, try using the file i wold be posting and then let me know
and put all he componets i put.
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Old 7th September 2010, 04:37 PM   #25
pra3718 is offline pra3718  India
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I build on general dotted pcb, there is no tracks. Please post your pcb,schematic etc., all information.

Thanks & Best Regards.
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Old 8th September 2010, 02:14 AM   #26
aditya is offline aditya  India
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i wold like to know what u are doing first i dont want to do spoon feeding, using a dot board, all the time is nto a good idea,
i want to see your assembled board, from both sides component and solder side.. i feel you have missed out on some part or its shorting some where, or u have not selected a proper gain level
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Old 8th September 2010, 02:15 AM   #27
aditya is offline aditya  India
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i will post but i want to see ur efforts
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Old 8th September 2010, 10:18 AM   #28
pra3718 is offline pra3718  India
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As per post # 23, I scraped everything.

Yesterday, I purchased new TDA7265 & required components and build again but this time Pin 2 Pin. And got success.

Build with...

1) Gain (22/1)+1 = 23 [ As per data-sheet (18/.560)+1 = 33 ]
2) Power supply 18 (+-) [ As per data-sheet 25W = 20 (+-) ]
3) Mute Pin kept floating

Observations :

1) Amp sounding not bad
2) Loudness poor.
3) POP at power ON/OFF
4) Chip running cool ( After 10 Min. continues running I touch the Chip & Heat sink near the chip mounted and found cool. Not warm even. )
As Chip is running cool I am not using it's full ability of this chip. Is it right ?

Alterations for Today :

1) I should try it with 18-0-18 Transformer.
2) I should increase gain = 33

Any advise ?

Thanks & Regards.
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Old 8th September 2010, 10:29 AM   #29
pra3718 is offline pra3718  India
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One thing, Due to Mute pin, I choose this chip. Otherwise TDA2050 is not bad.
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Old 10th September 2010, 09:10 AM   #30
pra3718 is offline pra3718  India
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Last 3-4 days I was unable to build tda7265 because 1st time purchased chips was fake. I scraped 3 chips. Today I purchase again from another stores and it was genuine. Original & Fake both chips looks similar only one difference I found is fake's pins are more thick & short and original chips's pins are long & thiner. I think Indian market is full of fake chips.
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