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Chip Amps Amplifiers based on integrated circuits

Td7266 audio amplifier
Td7266 audio amplifier
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Old 4th June 2019, 09:50 AM   #1
Anirvan is offline Anirvan
diyAudio Member
Join Date: Apr 2019
Smile Td7266 audio amplifier

Hi everyone!!
I thank all those who replied my earlier threads. This thread is mainly an awareness for all those diyers who Love to build their own audio amplifier boards but have none by their side to help them out.

Anyway, I happen to get hold of two Tda7266 chips from my local market and used one of them to build an amplifier for home use. The circuit looked quite cool, simple and neat after completion since it uses very few external components. But, after powering up the circuit heaven broke on my head when one of the channels of the amplifier remained totally silent even on full volume!!

On a thorough check out, I found that the pins 13, 14 & 15 which were VCC 2, OUT 2+ & OUT 2 - were actually internally open inside the chip. Then I tried the second IC which too was having the same manufacturing defect at the same three pins. So I want to advice all my friends here to check the pins of ICs with a multimeter before buying them if they are buying it from a store. Better carry your multimeter with you
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Old 4th June 2019, 12:32 PM   #2
Mark Tillotson is offline Mark Tillotson
diyAudio Member
Join Date: May 2018
Location: Cambridge UK
Fake chips again? - probably something like a factory reject TDA2003 in the larger package.
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