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Chip Amps Amplifiers based on integrated circuits

Help find replacement board with Tda7294 chip
Help find replacement board with Tda7294 chip
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Old 8th September 2019, 06:05 AM   #11
Fast Eddie D is offline Fast Eddie D  United States
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Join Date: May 2010
Location: Skokie Il
Originally Posted by Urielp View Post
The issue is in the other side,
The connections of the tda gone bad, some of them lost the connection and only plastic was left, i manage to do sove override , but still not working, it is no more blowing fuses but it is just stuck in stand-by mode

Also, unlike other popular chips, some of the TDA chips will burn up when the leads start separating from the circuit board. It depends on which leads come up first. That's because some TDA chips have separate leads for the power supply to the output stage. If you power up the driver stages first, it will smoke one of the output devices. The purpose is so you can apply s higher supply voltage to the driver stages, allowing the MOSFETS to be driven closer to saturation.

And TDA chips aren't that good for hi-fi anyway, because they have rising distortion with frequency. They're a logical choice for a cheap subwoofer though. They can be easily paralleled without a problem, unlike popular BJT chips. Some of them are designed to be paralleled. So with a bridge/parallel circuit, you could get a lot of power for real cheap.
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Old 18th September 2019, 03:33 PM   #12
nigelwright7557 is offline nigelwright7557  United Kingdom
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Join Date: Apr 2008
Location: Carlisle, England
Its probably the TDA as not much else to go wrong.
Unless power supply died ?
Cut off TDA pins as high up as possible then heat the pins up and grab quick with long nose pliers and pull them out. Not the easiest of jobs but I have done them without too much grief.
PCBCAD51 download or CDROM 2019 version out now https://www.murtonpikesystems.co.uk
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Old 18th September 2019, 03:49 PM   #13
Urielp is offline Urielp
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Join Date: Sep 2019
The power supply is working fine, and i did manage to replace the chip again, now, for som reason it is always on standby mode, and wont turn on ��
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