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Old 25th June 2012, 01:45 AM   #21
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When the current spikes, do you see the rail-rail square wave on the output transistors?
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Old 25th June 2012, 01:52 AM   #22
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Only on the high side fets. Should I remove the low side?
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Old 25th June 2012, 02:01 AM   #23
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The square wave will be on the drain of the low side and the source of the high side. Is that where you checked for the square wave?
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Old 25th June 2012, 02:29 AM   #24
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I was watching the gate.
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Old 25th June 2012, 10:22 AM   #25
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Check the points I listed. Do you get rail-rail oscillation?
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Old 25th June 2012, 04:46 PM   #26
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High side source
10uS/div, 50V/div
Gnd reference is rectifier

Click the image to open in full size.

There is some noise going on that isn't picked up by the camera.
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Old 25th June 2012, 04:53 PM   #27
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Low side drain
10uS, 50V/div
Gnd reference is speaker (-)

The high side looks the same as the picture below when referenced to the same gnd.

Click the image to open in full size.
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Old 25th June 2012, 05:24 PM   #28
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Did the displayed waveform look exactly like the photo?

Why is there a bright trace along the reference line of the display (second image)?

Are you now getting a good drive signal on the inputs of the driver IC?

Do you have good supply voltage across Vdd and Vss on the 2113?

What do you mean by 'Gnd reference is rectifier'? Do you mean the secondary ground?
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Old 26th June 2012, 06:13 PM   #29
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Quote:
Originally Posted by Perry Babin View Post
Did the displayed waveform look exactly like the photo?

Yes, the bright trace is eliminated when a stronger input signal is present

Why is there a bright trace along the reference line of the display (second image)?

If a stronger signal is driven the bright trace disappears.

Are you now getting a good drive signal on the inputs of the driver IC?

The input signal looks the same as above.

Do you have good supply voltage across Vdd and Vss on the 2113?

Did not check yet.

What do you mean by 'Gnd reference is rectifier'? Do you mean the secondary ground?

Never mind, referencing the wrong point.
Stronger input signal being driven in.
Click the image to open in full size.
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Old 8th September 2012, 01:44 PM   #30
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Finally back to this amp.

Idles fine, and for a split second will output a signal. As I adjust the volume up a signal will appear at the output, then the amp will start drawing about 10 amps and then back down to idle with no output.

I pulled the output inductors thinking they might be the issue. When I did this the amp would randomly spike the current.

Protection issue? The protection LED never lights.
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