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Old 9th October 2012, 10:59 AM   #31
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Which pins of the SG3526 are pulsing at the same rate as the power supply oscillation pulses on and off?
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Old 9th October 2012, 10:43 PM   #32
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I was struggling to take measurements ...

When the tension, was down to 0V, and stayed there, I could not make any comparisons with the waveforms ... and I had to wait half an hour, between measurements.

I have found, from pin 9 to pin 18 (pin 1 to pin 8 I could not check them, I'll try tomorrow ...)

The pins that come closest to the waveform found in the center leg MOSFET power supply, are: pin 13 and pin 16, I think, are the outputs, truth, Perry?

Should I check the other pin that I need to know, if indeed, this IC is failing?
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Old 10th October 2012, 09:28 AM   #33
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13 and 16 are the outputs but that's to be expected.

When do you mean "When the tension, was down to 0V, and stayed there". I understand that tension means voltage but which voltage?
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Old 10th October 2012, 11:14 AM   #34
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Yes, I mean, when I say that the voltage falls to 0V, (usually within 40 seconds of being connected) means longer intermittent, and off the LED.

As I'm checking with the scope, I have connected to the speaker output, the meter, to be watching at all times, the output voltage.
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Old 10th October 2012, 03:33 PM   #35
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The measurements that I needed, from pin 1 to pin 8, are:

Pin 3, 4, 5, 6, 7, 8, give me a very similar waveform to which I gave, the center pin of the MOSFET power source.

What do you think, Perry?
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Old 11th October 2012, 07:20 AM   #36
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Do you have pulsing DC voltage feeding the B+ terminal of the amp?
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Old 11th October 2012, 03:38 PM   #37
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This is what you see, with the probe connected to B +
Do you see something wrong, Perry?
Attached Images
File Type: jpg DSCF0580.JPG (665.2 KB, 36 views)
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Old 12th October 2012, 10:40 AM   #38
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It appears that your 12v power supply has shut down. How much current does the amp draw?

What's the current rating on the power supply?
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Old 12th October 2012, 06:48 PM   #39
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There is a power supply, a battery car is

Is 45 amps, but ... I checked and the truth is a bit low, is 11.50 volts

Can this be significant?
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Old 14th October 2012, 04:12 AM   #40
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Was the voltage measured when the amp was pulsing the power supply drive?

Can you charge it to eliminate this as a problem?

Batteries are typically rated for cold cranking amps (which would typically be much greater than 45 amps) or amp hours. It's not really important here but you should understand which you're looking at on the battery.
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