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Chip Amps Amplifiers based on integrated circuits

TDA7293 distortion/power supply issue
TDA7293 distortion/power supply issue
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Old 24th December 2017, 06:30 PM   #21
nigelwright7557 is offline nigelwright7557  United Kingdom
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Location: Carlisle, England
The tda chips can oscillate if the gain is too low or bad pcb layout.
Check for oscillation on the output.

Originally Posted by Fast Eddie D View Post
I wondered how these hucksters could build these boards cheaper than the cost of the parts, so I bought a few.
These fake amplifiers are made for the cost of the UK postage.
I looked into making and selling them and couldn't even remotely compete.
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk

Last edited by nigelwright7557; 24th December 2017 at 06:37 PM.
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Old 28th December 2017, 04:36 PM   #22
Auzman is offline Auzman
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Join Date: Jul 2014
Hi everyone.

I'm away from home for holidays so I cannot test more the amplifiers.
Since the schematic, parts values and type are the same as the application note and the PCB layout is not that bad, I believe that the issue is mainly due to the PSRR and supply quality. I will make further tests as soon as will be back home and report back.
Thanks to everyone, I wish you all wonderful holidays and a great new year!
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