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Test class d dwm drive board separately
Test class d dwm drive board separately
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Old 21st November 2020, 08:13 PM   #21
Perry Babin is offline Perry Babin  United States
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A current limiter should be used. Something like an 1157 lamp would be better than nothing.
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Old 21st November 2020, 11:51 PM   #22
Achim1409 is offline Achim1409  Germany
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Maybe Mario could say something. I use a toroidal transformer with 26v 0v 26v. I used a positive rectifier and a negative rectifier.. So I habe +30vdc,0v,-30vdc. I used regulators to produce +5vdc, - 5dc and a lm 7812 to produce +12vdc. All have a common ground.. I used +12 and common ground for the irs... And I think that's the problem.
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Old 21st November 2020, 11:54 PM   #23
Perry Babin is offline Perry Babin  United States
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Terminals 3 and 5 of the IC are typically at negative rail. The +12v reg has it's ground on the negative rail. The 5v are referenced to ground.

Post the DC voltage on all terminals of the 21844 IC.
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Old 22nd November 2020, 03:30 PM   #24
Achim1409 is offline Achim1409  Germany
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I modified my Power supply.I have a second winding, which is now used for the 12V.
The Negative is tied togehter with the negative rail.


The +-5V use a common center with negative and Positive rail..
Problem is now, that if i measure the osciloscope the 12V + and Negative rail, i have my clean 12V.
If i measure between +12V and common ground, the voltage isnt clean. Its flickering .
Is there a possibility to connect negative rail and common ground? Maybe with a ceramic cap?
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Old 22nd November 2020, 03:45 PM   #25
Perry Babin is offline Perry Babin  United States
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Is the negative rail stable if you use the common ground for the scope's reference?
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Old 22nd November 2020, 03:49 PM   #26
Achim1409 is offline Achim1409  Germany
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No, it looks like the rectifier is not working clean
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Old 22nd November 2020, 03:51 PM   #27
Achim1409 is offline Achim1409  Germany
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This is the negative rail
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File Type: jpg IMG_20201122_165103.jpg (523.1 KB, 28 views)
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Old 22nd November 2020, 04:13 PM   #28
Perry Babin is offline Perry Babin  United States
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It appears to have insufficient capacitance.
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Old 22nd November 2020, 05:45 PM   #29
Achim1409 is offline Achim1409  Germany
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Added some railcaps. Voltage is OK now.

I measured pin 1 with 50hz sine injected. No irs mounted..
what can cause this picture?
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File Type: jpg IMG_20201122_184428.jpg (891.1 KB, 22 views)
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Old 22nd November 2020, 05:51 PM   #30
MarioRestucci is offline MarioRestucci  Italy
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This is my power supply. You can see how I check the cards outside the amplifier. Pay close attention to where you put and where you don't put the negative rail.
Sorry, in picture the winding for +/-5v have an unconnected pin, is obviously connected to GND.
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File Type: jpg 20201122_184541.jpg (865.0 KB, 24 views)
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