WHICH IS THE REAL TDA 1543 ?? - diyAudio
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Old 13th July 2014, 01:30 PM   #1
kp93300 is offline kp93300  Malaysia
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Default WHICH IS THE REAL TDA 1543 ??

I bought some tda 1543 of ebay a few months ago and it differs from another build up board that is also from china.
They are very different .
Which is the real thing ???


I breadboard the tda 1543 and unable to get it to play. Input is 7 V dc and i measure 3.5 V dc at the AOL and AOR. Is this correct??
The reference resistor is 1 K.the IV resistor is 1.5 K.
when i play music i get white noise that sound like between 2 FM radio station .

thanks for the help

kp93300
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Old 13th July 2014, 02:43 PM   #2
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My TDA is like the one with pcb not like from adelepart.

Didiet
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Old 13th July 2014, 02:54 PM   #3
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After bad experiences with ebay semiconductors I no longer buy them off ebay.
I stick to reputable dealers like RS and Farnell.
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Old 13th July 2014, 03:14 PM   #4
kp93300 is offline kp93300  Malaysia
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TDA 1543 is no longer stocked by element14 ot Rs on line

I use amanero usb to i2s converter to feed the i2s line. It uses 22.5792 and 24.576 TCXO. Is this an issue with TDA 1543 ??
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Old 14th July 2014, 12:39 AM   #5
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I don't know about amanero. But but you need to make sure i2s format are 16 bit (24bit works to)

Didiet
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Old 14th July 2014, 01:01 AM   #6
kp93300 is offline kp93300  Malaysia
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I have checked the boxes under the driver in windows 8 outputting 16 bit, 22.1 or 48 files..

with a 7Vdc input, i measure 3.5 V dc at AOR and AOL.
With the Ref resistor at 1.2k , i measure 2.1 v dc at the V ref .
are these correct values ??
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Old 14th July 2014, 01:02 AM   #7
kp93300 is offline kp93300  Malaysia
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In fact i have also tried with a another usb i2s converter based on Tenor 7022 chip.. same problem
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Old 15th July 2014, 10:05 AM   #8
DF96 is online now DF96  England
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For a 7V supply you need Rref of 1k or 1.1k - see my web page. Use the wrong values and you are relying on chip parameter tolerances, so some chips will work and others will not.

Vref should be about the same voltage whatever you use for Rref - it is a reference voltage!
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Old 16th July 2014, 11:48 AM   #9
Jempie is offline Jempie  Indonesia
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Quote:
Originally Posted by DF96 View Post
For a 7V supply you need Rref of 1k or 1.1k - see my web page. Use the wrong values and you are relying on chip parameter tolerances, so some chips will work and others will not.

Vref should be about the same voltage whatever you use for Rref - it is a reference voltage!
hi,

I have visit you webpage. I have also bought some TDA1543 by Ebay and
only noise. so these are not fake?
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Old 16th July 2014, 01:21 PM   #10
DF96 is online now DF96  England
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I don't know which are fake. If you use the wrong resistor values and get no sound then this does not necessarily mean they are fake, as some good ones might not work with the wrong values.
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