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Old 20-05-2017, 09:17 PM
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wasyoungonce (Brendan)
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wasyoungonce is offline
 
Join Date: Jul 2006
Location: Mexico city (Melb), Australia
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Ok Garys PCB1 is done. Again I had left hand noise bars in the dark frames although this time they were hard to the left not across the image. Again removing C38/C46 and inserting a 220uf electro cap fixed the issue.

I'm going to leave this capacitor in as a fix as this has been successful for me. I think the noise is a combination of issues: the ceramic caps are poor at noise ripple removal; the caps are laid in the wrong place; the filter capacitance is possible low. Its normal to use a combination of ceramic caps and electros for power line filtering and I suspect this is why adding the electro works.

Of note is that many many others with different PCB layouts have had similar issues.

I'm making a "camera obsucera" (pin hole camera) to do a daytime light frame. Busy like a kindergarten kid with toilet roll tubes paper glue/mache etc! Anyway I've already done light frames so its really just a play time task!

Oh this PCB draw a little more current than PCB2 but not enough to worry no ICs are getting hotter than normal. Just monitoring it.
Attached Thumbnails
Click for full-size image (PCB1 0ms Dark.jpg)
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Click for full-size image (PCB1 1s Dark.jpg)
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Click for full-size image (PCB1 10s Dark.jpg)
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Click for full-size image (PCB1 150ms light with lens.jpg)
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