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Rockseries 3000w gate output waveform
Rockseries 3000w gate output waveform
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Old 26th April 2019, 07:24 PM   #11
Perry Babin is offline Perry Babin  United States
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Note timebase and vertical amplifier setting for each.

Mouseover for descriptive file names.

Q10 = Q4
Attached Images
File Type: jpg IMG_2252 - driverboardp10s.jpg (85.4 KB, 21 views)
File Type: jpg IMG_2243 - optop2s.jpg (87.2 KB, 20 views)
File Type: jpg IMG_2244 - optop6s.jpg (88.4 KB, 19 views)
File Type: jpg IMG_2245 - q10bs.jpg (89.0 KB, 20 views)
File Type: jpg IMG_2246 - q10cs.jpg (86.8 KB, 20 views)
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Old 27th April 2019, 06:03 AM   #12
joselorenzo is offline joselorenzo  Mexico
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There is a lot of similarity in waveforms.
It's time to test the operation of the amplifier

I appreciate your time and help in the subject
regards
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Old 27th April 2019, 06:13 AM   #13
Perry Babin is offline Perry Babin  United States
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The ones above are similar but the output drive (as was previously stated in post #3) doesn't look good. I suspect that the NPN driver transistor is defective. Remove it and check it.
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Old 27th April 2019, 07:24 AM   #14
joselorenzo is offline joselorenzo  Mexico
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I had installed all new transistors drivers.

Again I changed DK transistor.

I upload images of the waveforms in the gate terminals of the output transistors audio.
I do not see any change
Attached Images
File Type: jpg 5v 5us.jpg (163.5 KB, 6 views)
File Type: jpg 5v 2us.jpg (212.7 KB, 7 views)
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Old 27th April 2019, 07:47 AM   #15
Perry Babin is offline Perry Babin  United States
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What do the base and emitter waveforms on the DK and the base of the AG transistors look like?
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Old 27th April 2019, 07:52 AM   #16
Perry Babin is offline Perry Babin  United States
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see also 15.

Are you using the exact replacement outputs from a reputable distributor?

What does the gate on the high-side look like?

What's the timebase setting on your scope?
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Old 27th April 2019, 09:44 AM   #17
joselorenzo is offline joselorenzo  Mexico
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What do the base and emitter waveforms on the DK and the base of the AG transistors look like?
I upload pictures of the waveforms of DK and AG LOW SIDE AND HIGH SIDE.
Are you using the exact replacement outputs from a reputable distributor?
Verical and lcsc.com
What does the gate on the high-side look like?
I upload pictures
What's the timebase setting on your scope?
In all the recent measurements with photography Time/Div 2us
Attached Images
File Type: jpg BASE AG 5V 2US LOW SIDE.jpg (180.1 KB, 6 views)
File Type: jpg EMITTER AG 5V 2US LOW SIDE.jpg (183.3 KB, 3 views)
File Type: jpg BASE DK 5v 2us LOW SIDE .jpg (180.2 KB, 3 views)
File Type: jpg Emitter DK 5v 2us.jpg (709.4 KB, 4 views)

Last edited by joselorenzo; 27th April 2019 at 09:46 AM. Reason: pictures of BASE EMITTER DK AG LOW SIDE
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Old 27th April 2019, 09:54 AM   #18
joselorenzo is offline joselorenzo  Mexico
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The following measurements with photography are from the AG and DK transistors on the high side
And the gate waveform output transitor
Attached Images
File Type: jpg BASE DK 50V 2US HIGH SIDE.jpg (597.5 KB, 6 views)
File Type: jpg EMITTER DK 50V 2US HS.jpg (713.1 KB, 5 views)
File Type: jpg BASE AG 50V 2US HIGH SIDE.jpg (752.7 KB, 3 views)
File Type: jpg EMITTER AG 50V 2US HS.jpg (713.3 KB, 4 views)
File Type: jpg gate high-side.jpg (693.3 KB, 4 views)
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Old 27th April 2019, 02:15 PM   #19
Perry Babin is offline Perry Babin  United States
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Is the var sweep control fully clockwise on your scope?

Unless you have two probes and you use your scope in differential mode with DC coupling, I think you're going to have to remove the rectifiers to get usable high side waveforms. The waveforms I posted that show the partial face of the scope were all taken with no rectifiers. These are the low side.

Q12 is the NPN driver. Q14 is the PNP driver. The emitters of both are directly connected so only one photo is needed.

Did you buy these FETs from verical or lcsc? I don't see lcsc as being authorized by any semiconductor manufacturer.
Attached Images
File Type: jpg IMG_2247 - q12bs.jpg (65.9 KB, 4 views)
File Type: jpg IMG_2248 - q12es.jpg (65.2 KB, 4 views)
File Type: jpg IMG_2249 - q14bs.jpg (65.6 KB, 5 views)

Last edited by Perry Babin; 27th April 2019 at 02:29 PM.
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