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Old 9th December 2016, 10:13 PM   #1
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Default Research into IGBT audio amplifier.

I am having a go at making a 150WRMS into 4 ohms quasi audio amplifier using a pair of IGBT's.
The igbt's are NGTB35N65FL2WG.
Does anyone foresee any problems with this ?
Click the image to open in full size.
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Old 10th December 2016, 12:53 AM   #2
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Hint: Crop and invert colours prior to uploading. Hard to read even at 100% with very modest pixel density.
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Old 10th December 2016, 12:58 AM   #3
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Quote:
Originally Posted by sgrossklass View Post
Hint: Crop and invert colours prior to uploading. Hard to read even at 100% with very modest pixel density.
I have cropped it.
My picture software wont invert it.
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Old 10th December 2016, 04:02 AM   #4
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Your previous schematic posts feature inverted colours (i.e black background, white traces) and large format. While unusual, that is at least legible. I have to agree that a schematic in this format for PCB design, is difficult to read and follow so I resorted to sketching what could be read onto paper.
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Old 10th December 2016, 02:29 PM   #5
xrk971 is online now xrk971  United States
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That image has been down sampled and makes fonts illegible. Even when it was legible, the non standard symbols and disproportionate scales for components makes it very hard to understand or follow.

The diagrams from LTSpice are better and Tina is an improvement over that even. Best ones are of course, hand made in a graphics program. My vote for best looking and most elegant schematics are from Apex Audio and Juma. Juma looks like he uses ASCII characters for graphics.
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Old 10th December 2016, 09:29 PM   #6
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Quote:
Originally Posted by xrk971 View Post
That image has been down sampled and makes fonts illegible. Even when it was legible, the non standard symbols and disproportionate scales for components makes it very hard to understand or follow.
.
Its simply too much info zoomed down to fit on a screen.
There are no fonts, the text is a vector character set.

I should have split it into two and zoomed out one step.
Click the image to open in full size.
Click the image to open in full size.
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Last edited by nigelwright7557; 10th December 2016 at 09:33 PM.
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Old 11th December 2016, 10:34 AM   #7
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OH, I guess we know what software not to use,
listed in the sig of Nigel.
It's worse than bad video games of the 60's.
errr, make the 70's or 80's.

Y'all are right, non-standard symbols and other issues
color problems...almost looks like a screwed up four color sep
and they got the colors wrong....oh it must be before the plate y'all.



It's late, shut eye time.

cheers,
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Old 11th December 2016, 10:49 AM   #8
nattawa is offline nattawa  Canada
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Instead of posting a direct screen shot of it, either printing the schematic into a pdf, or screen shooting a print preview if the monitor has high resolution, usually turns whatever the background color to white, and will perhaps make your critics happy
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Old 11th December 2016, 05:21 PM   #9
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Quote:
Originally Posted by SyncTronX View Post
OH, I guess we know what software not to use,
listed in the sig of Nigel.

It's late, shut eye time.

cheers,
I am not going to get bogged down in stupid off topic comments.

I can read the latest screen shots with no problems and have little sight in my left eye !

I was hoping to get some serious comments on the IGBT amplifier.
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Old 11th December 2016, 06:07 PM   #10
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With the large input capacitance and rather high turn on voltage, I'm not seeing any real advantage in using these igbt's over pure mosfets of the same power range.
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