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Old 18th November 2012, 09:02 AM   #11
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Ok sorry Pin 11 of the 3525 gos to Pin 8 of the driver IC
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Old 18th November 2012, 09:13 AM   #12
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So what connects to pin 10?
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Old 18th November 2012, 09:16 AM   #13
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Ok found 1 problem the Driver IC is in a socket and as soon as i wiggle the IC around in the socket it gets voltage on PIn 8 and the power light comes on..


Im gonna order a new driver IC and remove the socket since the legs are ready to break on the IC

Amp still does crazy stuff with the output..


Wondering Should i order the IRF3710Z's For this amp and replace the IRFB4710's to see if that cures the output problem since this a HIP4080 based amp..

Pin 10 connects to the collector of a MMBT4401

Last edited by S Merlington; 18th November 2012 at 09:21 AM.
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Old 18th November 2012, 09:22 AM   #14
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Do you know if the amp was working properly with the 4710s?

It would be a lot of work to replace them and should be left as a last resort.

You should be able to get the op-amp connected well enough to do further troubleshooting. If so, you'll have to determine if the power supply is being shut down when the audio fades out.
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Old 18th November 2012, 09:25 AM   #15
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Not sure if the amp was working correctly with the 4710's or not since the guy who brought it to me said he outputs and the power supply fets were blown and he just replaced them and couldnt get the amp to work
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Old 18th November 2012, 01:16 PM   #16
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You'll need to determine what is shutting the amp down (a real fault that's triggering one of the protection circuits or a fault in the power supply that's not keeping it on).
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Old 18th November 2012, 09:10 PM   #17
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How do i tell which way the 826 is suppose to sit in the board???

It was in 1 way when i got the amp but the markings on the board shows it goes the other way any ideas?
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Old 18th November 2012, 09:14 PM   #18
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I would expect pin 4 to connect to ground.
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Old 19th November 2012, 12:56 AM   #19
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Right now Pin 7 connects to ground

If i reverse the direction of the op-amp pin 3 would be connected to ground

Heres the datasheet i found..

AD826AN pdf, AD826AN description, AD826AN datasheets, AD826AN view ::: ALLDATASHEET :::


So which would be correct Pin 7 connected to the amps ground terminal or Pin 2 connects to amps ground termianl ??
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Old 19th November 2012, 03:25 AM   #20
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I don't have any information on this amp so I didn't realize it initially but you appear to have an op-amp in place of a driver IC. Pins 11 and 14 will connect to pins 2 and 4 on the 8-pin IC which should probably be a TC4424 or an MIC4424. If that's true, pin 3 would be ground. Pins 5 and 7 would drive the FETs.
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