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  #921  
Old 29-10-2018, 05:56 AM
Zoroastro (Luca)
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Quote:
Originally Posted by luka View Post
Problem is fixed.

I added 100uF capacitor next to the pin 9 of DD8, going between the pin 16 and 12 track and GND. Image 1 shows the location of the capacitor.

Interestingly adding a capacitor next to pin 16 on the top of R16 to GND did not have any effect. In this position it is even closer to pin 16 as in the example above. Image 2 shows the location of the capacitor.

Also it should be noted that the quality of the power supply plays an important role. I tried several and some had vertical stripes which were not visible with other power supplies.

Finally, image 3 shows noise for 0ms exposure of the improved Cam86. It was kept in the fridge for few minutes to cool down but not for too long as I didn't want to have condensation on it. My guess is that the sensor was at 10-15 degrees C. Also the sensor was not in complete darkness (light leaking from the left hand side on the image).
Hi Luka, has the latest PCB been corrected for this issue?
Thx,
Luca
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  #922  
Old 15-11-2018, 04:41 PM
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luka
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Hi Luca,

Sorry for the slow reply. Haven't check the IIS forums for a while, usually I on it several times every day but other things got in the way

No, the PCB is still the same. The Ukrainian PCB has the same issue, although I the effect may be smaller there.
I have tried using other capacitors but the lines did not improve much. Patrice (from French forums) used a larger tantalum capacitor (on Ukrainian PCB) and that helped. However, the capacitor is only rated for 6.3V which is way too close to 6V for my comfort. With the tantalum capacitors I like to have at least double-the-voltage derating.

Having said that, I have found out that the vertical stripes are not an issue, the bias files correct for them 100%. Also the image corners usually get cropped anyway.
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  #923  
Old 10-01-2019, 06:08 PM
mlago (Marcos)
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Hello everyone.
I have been following this thread, as well as the others of astroclub.kiev.ua and cloudynights related to the CAM8X project. I thank you for the great job you have done.

The doubt that I have, after reading them in both places and for the modifications that have been introduced in this time, is to know which is the most recent version. I believe that the most current version of the project is your IIS PCB. So I would be very grateful if you could tell me where I can look the latest CAM86 project files.

Thanks in advance.
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  #924  
Old 10-01-2019, 07:03 PM
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wasyoungonce (Brendan)
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PM Luka but I’m not sure what the files are up to atm. I had to stop the project due to hospitalisation and on going issues. Also the group would want you to actively assist on development not just grab the latest files.

I hope to rejoin devolpment but could be up to 6 months before I can. Also I think Luka is quite busy atm
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  #925  
Old 10-01-2019, 11:21 PM
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luka
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Hi Marcos,

Can you PM me regarding your request.

There are two versions of the PCB, ours and the original Ukrainian. Our version:
1. has improved TEC power
2. has an issue with capacitors being too far from one of the components (DD8) resulting in vertical lines on the left side of the image.
This is not really a problem as bias files completely remove the vertical lines from the final image.
Also the vertical lines can be overcome by using larger capacitors and some "creative" soldering.
(Note that the Ukrainian version also has vertical lines but less intense)

Luka
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  #926  
Old 11-01-2019, 12:35 AM
mlago (Marcos)
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Thank you very much to both.
Quote:
Originally Posted by luka
There are two versions of the PCB, ours and the original Ukrainian. Our version:
1. has improved TEC power
2. has an issue with capacitors being too far from one of the components (DD8) resulting in vertical lines on the left side of the image.
This is not really a problem as bias files completely remove the vertical lines from the final image.
Also the vertical lines can be overcome by using larger capacitors and some "creative" soldering.
(Note that the Ukrainian version also has vertical lines but less intense)
With his explanation now I have it more clear. I will send you a PM, thanks so much!!
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