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Old 8th May 2013, 03:31 AM   #1
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Default Soundigital 16kd

This unit had 4 bad audio output MOSFET,
They were all replaced together with the IR2113 driver IC,
But know the amp have a noise like if it was missing a ground,
There is audio, but it sound like when an amp have the ground
Shield connector broken.
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Last edited by megael9; 8th May 2013 at 03:33 AM. Reason: Wrong title
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Old 8th May 2013, 10:33 AM   #2
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Please, post some pics of the amp
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Old 9th May 2013, 01:35 AM   #3
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here are some pictures
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Last edited by megael9; 9th May 2013 at 01:40 AM.
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Old 9th May 2013, 07:56 AM   #4
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Do you have +/- 15V on pins 4 and 11 of TL074 ?
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Old 9th May 2013, 08:02 PM   #5
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There is +/- 12 volts at pins
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Old 9th May 2013, 08:29 PM   #6
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Looking at your other post, regarding noise, are you sure your signal source is grounded along with your power supply ?
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Old 9th May 2013, 11:49 PM   #7
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I traced the RCA ground connector and it does not connected straight to the power supply ground, it goes to a couple of resistor and then goes to one of the two tl074 ICs.
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Old 10th May 2013, 02:04 PM   #8
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what if you connect a cable between the RCA shields of the amp and the ground of your power supply?

Does the noise go away?
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Old 11th May 2013, 05:40 PM   #9
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Can that cause damage to the amp?
If not I can try it.
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Old 11th May 2013, 05:57 PM   #10
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No, it will not.
If an amplifier is installed in a car, the RCAs ground is the chassis, so is the power ground of the amp.

How do you feed signal to the amp in your bench?
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