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Old 20th October 2019, 09:54 PM   #1
shanecapetown is offline shanecapetown  South Africa
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Default Solar amplifier

Hi guys im currently busy with a solar class d amplifier I got the amp with the power supply fets blown replaced it and powered up the amp i got class d switch on output fets and amp is playing but there is a high pitch sound on the speaker no fets heating up just the AG AND DK ON DRIVER BOARD BUT IT'S NOT BURNING HOT JUST LOW is that normal?
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Old 21st October 2019, 12:54 AM   #2
Perry Babin is offline Perry Babin  United States
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Photos of the main and driver board?

Does it sound like this:
http://www.bcae1.com/temp/cooleditmixedoscillator01.wav

Are you hearing it through a subwoofer or are you using a full range speaker for testing?
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Old 21st October 2019, 03:44 PM   #3
shanecapetown is offline shanecapetown  South Africa
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Quote:
Originally Posted by Perry Babin View Post
Photos of the main and driver board?

Does it sound like this:
http://www.bcae1.com/temp/cooleditmixedoscillator01.wav

Are you hearing it through a subwoofer or are you using a full range speaker for testing?
It does make that sound yes I'm using a full range speaker to test
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Old 21st October 2019, 07:01 PM   #4
Perry Babin is offline Perry Babin  United States
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That's normal for an amp that doesn't have synchronization between the power supply and output stage oscillators.

There isn't much you can do about it. It's generally not bad enough to be heard with subwoofers, especially when they're mounted in the trunk.
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Old 21st October 2019, 08:54 PM   #5
shanecapetown is offline shanecapetown  South Africa
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Quote:
Originally Posted by Perry Babin View Post
That's normal for an amp that doesn't have synchronization between the power supply and output stage oscillators.

There isn't much you can do about it. It's generally not bad enough to be heard with subwoofers, especially when they're mounted in the trunk.
Ok thank u sorry is it normal for the Dk & AG transistors to warm up
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Old 21st October 2019, 10:52 PM   #6
shanecapetown is offline shanecapetown  South Africa
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Quote:
Originally Posted by shanecapetown View Post
Ok thank u sorry is it normal for the Dk & AG transistors to warm up
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Old 22nd October 2019, 01:52 AM   #7
Perry Babin is offline Perry Babin  United States
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Yes.

On amps like this, you have to confirm that ALL output transistors have drive. It's possible for some of the drive circuits to fail and the amp still work (or appear to work) normally.
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Old 22nd October 2019, 06:02 AM   #8
shanecapetown is offline shanecapetown  South Africa
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Quote:
Originally Posted by Perry Babin View Post
Yes.

On amps like this, you have to confirm that ALL output transistors have drive. It's possible for some of the drive circuits to fail and the amp still work (or appear to work) normally.
Hi Perry all outputs gets drive . So this amp is good. To go
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