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Tda 1514a help please
Tda 1514a help please
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Old 18th November 2020, 05:24 PM   #11
Gmarkw2 is offline Gmarkw2
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Thanks so much for your help. Agree with the thinking. Board very clean and no other real clues. Voltage regs for smaller control op amps check out ok also. Have checked all electrolytics around the chip and found ok. Ah well I will await 2 new chips and get them in to try. I will report back for the benefit of others.
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Old 18th November 2020, 05:34 PM   #12
Mooly is offline Mooly  United Kingdom
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Tda 1514a help please
You're welcome

The chip should obey all the classic rules applicable to an opamp... namely that the output will do whatever it takes to bring the voltage difference between the two inputs to 'zero'. Looking like the chip then at this point.
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Old 26th November 2020, 09:00 PM   #13
Gmarkw2 is offline Gmarkw2
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2 new chips received and installed. Powered up through dim bulb rig. No current issues, output dc offset now down at a few millivolts per channel. Connected up to speakers and a lovely sound was had.
It pays to be questioning and cautious.
Thank you for the helping hand guys.
Mark
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Old 27th November 2020, 07:02 AM   #14
Mooly is offline Mooly  United Kingdom
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Tda 1514a help please
that's good. Pleased to hear it was an easy fix in the end.
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Old 27th November 2020, 07:11 AM   #15
wiseoldtech is offline wiseoldtech  United States
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I'd simply replace the amp chips, and as Mooly said, load a 100 ohm resistor to each, dim-bulb it, and if everything checks out, call it a day.
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Old 27th November 2020, 07:30 AM   #16
Gmarkw2 is offline Gmarkw2
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Yep all up and running and I have to say it sounds pretty rich and balanced. I was a bit sceptical about the simplicity of this amp but sound is good.
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