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Class D Switching Power Amplifiers and Power D/A conversion

Insane DC offset Sure TDA7498 2x25W
Insane DC offset Sure TDA7498 2x25W
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Old 24th June 2012, 11:39 AM   #1
Helsethn is offline Helsethn
diyAudio Member
Join Date: Jun 2012
Default Insane DC offset Sure TDA7498 2x25W

I've bought the Sure Electronics TDA7498 2x25W and the recommended rotary volume encoder. When powering up with a 16v power supply the speakers get "sucked in" and i'm measuring 4(!)V of DC offset. The sound is really distorted and low. I have two amplifiers with the exact same problem, so i think this is a design flaw, where Sure has bias-adjusted the amplifier using a different power supply. I read an article where a guy removed two resistors from a Sure board and DC offsets dropped from around 1.2V to 15mV. Is this possible with my board? Or are there anything else i can do to reduce this crazy DC offset?

Schematic: http://www.sure-electronics.net/down...Ver1.0_SCH.pdf

Article describing the modification: Sure TA2024 DC offset Mod
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