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Old 26th December 2013, 09:35 PM   #1
d0ugb is offline d0ugb  United States
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Default Help my cmoy is popping caps

So i need some help,

This not my first cmoy build, however this is the first time I have attempted to design my own schematic, and PCB layout. I have been wanting to try the tle2426cp instead of using the resistor method of rail splitting, however I am having issues. The cap I am using for the power supply is over heating and popping, which is in turn causing the tle to get incredibly hot. Attached is a copy of my schematic, and my board layout. Please if you can let me know if there is anything obvious thanks!cmoy1.pdf

cmoy2.pdf

I am using the schematic and idea from this site:

isendev.blogdns.org
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Old 26th December 2013, 10:06 PM   #2
godfrey is offline godfrey  South Africa
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Is that a double sided board? In the layout you showed, some connections are missing. e.g. the output of the rail splitter isn't connected to anything besides CNR.
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Old 26th December 2013, 10:55 PM   #3
DUG is offline DUG  Canada
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Questions:

Is the supply feeding this board connected with anything else?

Have you rung out the board? (checked with an ohmmeter that connections are where they are supposed to be)

Comment:

I would have made the GND an actual bottom side ground plane rather than have the GND path wander all over the board. Then when you need a connection to GND you just connect to the bottom of the board right at that spot.

Happy learning
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Old 27th December 2013, 02:45 AM   #4
d0ugb is offline d0ugb  United States
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The rail splitter connects to the CNR then out to the opamp via a small jumper. I have checked for shorts, but I have not checked to the resistance with an ohm meter. Its a single sided board, I have a connection to ground with which I plan to connect to a mounted stud inside my project box. I used the auto router when I laid our the board. I need to start the board from scratch, however does the schematic look fine?

Thanks for your help!
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Old 27th December 2013, 01:17 PM   #5
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How much voltage are you powering the amp with?
What is the voltage rating of the cap that fails?

You might want to read this.

Last edited by Avro Arrow; 27th December 2013 at 01:20 PM. Reason: added information
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Old 27th December 2013, 01:22 PM   #6
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Quote:
Originally Posted by d0ugb View Post
I used the auto router when I laid our the board. I need to start the board from scratch, however does the schematic look fine?

Thanks for your help!
The autorouter is awful.
Use a two layer board with a ground plane on one side.
Lay out the traces manually.
You can get boards made here pretty cheap.

Last edited by Avro Arrow; 27th December 2013 at 01:25 PM.
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