#341  
Old 02-11-2016, 03:20 AM
gehelem (Gilles)
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Hi,
there's a new article on ukrainian site http://astroccd.org/2016/10/cam86/
what do you think ?

BTW : my indilib driver for Cam84 is now working !

Gilles.
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  #342  
Old 02-11-2016, 10:26 PM
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It is great news that Cam86 was added to the astroccd site. This confirms that it had enough testing to join the other "finished" Cam versions.

And Gilles, great work with the indi driver for Cam86
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  #343  
Old 04-11-2016, 07:30 AM
gehelem (Gilles)
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Quote:
Originally Posted by luka View Post
And Gilles, great work with the indi driver for Cam86
Please note that my driver is for Cam84, not Cam86 !
For sure il will also try to make another one for Cam86, but only when i'll have a working board, wich might be long (children, wife, work...)

Gilles.
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  #344  
Old 11-11-2016, 01:01 AM
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I have a D40 sensor that is still in the carrier. I was planing to debayer it and have removed the cover glass. But I broke the DSLR so I cannot track the progress of the debayering.

I could remove it from the carrier with the DMSO and use the future Cam86 for checking of the progress of debayering but I am not sure if it will survive the DMSO bath without the cover glass.

How deep does the DMSO bath need to be? Does the whole sensor get submerged?
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  #345  
Old 11-11-2016, 01:55 AM
gehelem (Gilles)
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Quote:
Originally Posted by luka View Post
I have a D40 sensor that is still in the carrier. I was planing to debayer it and have removed the cover glass. But I broke the DSLR so I cannot track the progress of the debayering.

I could remove it from the carrier with the DMSO and use the future Cam86 for checking of the progress of debayering but I am not sure if it will survive the DMSO bath without the cover glass.

How deep does the DMSO bath need to be? Does the whole sensor get submerged?
i think whatever you do, it will be difficult to avoid the DMSO enters the sensor: for all the glue to disappear you must stir and scrape
Gilles.
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  #346  
Old 11-11-2016, 02:27 AM
gehelem (Gilles)
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Have you seen last posts on the Ukrainian forum ?
These guys are awesome !
Where do they find time for all these investigations ? really ? Where ?
unless it's not a question of time, but a question of knowledge...
No seller for that on ebay...
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  #347  
Old 11-11-2016, 02:35 AM
gehelem (Gilles)
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Quote:
Originally Posted by luka View Post
How deep does the DMSO bath need to be? Does the whole sensor get submerged?
you can also have a look at this video :
https://www.youtube.com/watch?v=_TBC5_qM-hs
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  #348  
Old 11-11-2016, 06:33 AM
pat30 (Patrice)
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I had put it just above the aluminum, not immersed whole that was enough.
Normally DMSO does not attack the CCD or microlens.

Yes Gilles, they do a great job!
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  #349  
Old 12-11-2016, 10:42 PM
pat30 (Patrice)
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hi,
I put the copy of my message sent to the Ukrainian for a few tests:

I have not yet received my cxd1267 but I mounted the Cam to do the cooling test.

For me the PMW is not good:
Test 1
Cam, fan and TEC powered with 7.5 V, PWM CAM86= -12 C under ambient temperature in 6 minutes, and is very long to go up after the capture
Test 2
Cam, fan 12 V and TEC 5.7 V, PWM CAM86 = -15 C under ambient temperature in 4 minutes and is very long to go up after the capture
Test 3
Cam, fan 12 V and TEC 5.7 V, no PWM (bang bang per switch) = -22 C under ambient temperature in 2 minutes and goes up very quickly after stop of 3 seconds

I think we should try for assembly as me:
1 / PWM 100% until good temperature and 60% after and during capture

if not good:

2 / BANG BANG (1-0)
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  #350  
Old 14-11-2016, 04:37 PM
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wasyoungonce (Brendan)
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Quote:
Originally Posted by luka View Post
...How deep does the DMSO bath need to be? Does the whole sensor get submerged?

Hi Luka...just enough to cover the Lens or pins. No need to agitate solution or assy. Just leave for a few days and away it will come away.

Sorry been sick for last 1.5 weeks damn flu or something. Got infected...worst man flu ever! Just received dual stage TEC TES2-19003. Will test and also try new VT1 switch IRF7832.
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  #351  
Old 15-11-2016, 05:30 AM
pat30 (Patrice)
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Hello, a member of the French forum gave me that, super explanation for the Peltier
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  #352  
Old 22-11-2016, 01:09 AM
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Thank you Patrice for the link, it is a very good reading.

By the way, I picked up 2 more semi-broken D70 on ebay for about $35 each (shipped).
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  #353  
Old 23-11-2016, 06:07 PM
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wasyoungonce (Brendan)
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Ok just a quick post...reaching -21C with TES2-19003, 10V, 2A in 10mins (-15C in 5 mins). So it's promising indeed.

Need to find optimum volts and current and test it with the new VT1.

Brendan
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  #354  
Old 24-11-2016, 12:30 PM
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wasyoungonce (Brendan)
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Sorry stuck atm talking to a man about a PSU. My DIY is not working I need a new PSU now. Hopefully soon within a few days.

I tested the TES2-19003 @12V DC....managed down to -22C in 10 mins (was -17C in 5 mins, ambient 20C) @2.2A, a delta of 42C!

That said we need something constant not something minimum. However I get the impression this TEC would easily run at -15C ~-18C in camera but I need to try different try different combinations of power first.

My new thermoelectric controller display changes from points of a C to whole C when it reaches -10C. Limited digits....bummer!
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  #355  
Old 24-11-2016, 11:15 PM
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Excellent work Brendan

That is very good news about the Peltier. I had a good feeling about this one from the beginning.
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  #356  
Old 25-11-2016, 03:31 PM
pat30 (Patrice)
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Hello everyone
Just a word to tell you that my Cam86 works but I have a problem with the cooling which once all mounted does not give good result 10 less than at room temperature. Stay tuned .....

http://www.astroclub.kiev.ua/forum/i...h=114582;image
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  #357  
Old 25-11-2016, 03:33 PM
pat30 (Patrice)
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Hello everyone
Just a word to tell you that my Cam86 works but I have a problem with the cooling which once all mounted does not give good result 10 less than at room temperature. Stay tuned .....


http://www.astroclub.kiev.ua/forum/i...h=114582;image
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  #358  
Old 25-11-2016, 03:34 PM
pat30 (Patrice)
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Hello everyone
Just a word to tell you that my Cam86 works but I have a problem with the cooling which once all mounted does not give good result 10 less than at room temperature . Stay tuned .....


http://www.astroclub.kiev.ua/forum/i...h=114582;image
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  #359  
Old 25-11-2016, 06:15 PM
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Hi Pat.....excellent work...but hey your hair looks....fuzzzy!

Been a little stuck atm...I had small bug that got worse then the damn Melbourne Asthma storm of the century hit. This buggered me quite a bit. Finally on steroids...should be good to go soon.

But I'm still suffering from "bench PSU fixation". I need one to finalise my TEC tests as my PSUs cut out between 10V DC to ~8V DC...right where I need to test!....mumble mumble.

I missed out on some neat HP 224B's on fleabay now looking at Korad KA-3005D (or 3005P)to pickup from wavecom....hopefully on Monday. Then I had to fix my CRO.....urgggh!

Cool story though...

Last edited by wasyoungonce; 25-11-2016 at 07:31 PM.
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  #360  
Old 26-11-2016, 12:26 PM
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Wish I had the time. Great project and I have D70 CCD. Project burn out.

Is this of any help for your TEC calculations.

TEC hot side (TH) formula; where

TA = air temperature
Q = heatload - active + passive

Calculate Heatsink RQ

TH = TA + (V*I + Q)RQ

Transposing;

Heatsink Rating C/W

RQ = (TH - TA)/(V*I +Q)

or, substituting W for V*I

RQ = (TH TA)/(W + Q)

Calculate copper plate passive heat load

Passive heat load formula Qp = kAD/L where;

k = the conductivity value of the material
A = the area of the conduction source
D = the differential between air temperature and component temperature.
L = the length of the conductive medium
k (kappa) of copper = 348 - steel k = 56 - fibreglass or plastic attributed k = 0.04.

Sensor active heat load
~250mW / MP - just an estimate.

I've attached an RQ calculator which is interesting to play with. Based on the TH formula above.
Attached Thumbnails
Click for full-size image (RQCalcUsage.jpg)
129.7 KB15 views
Attached Files
File Type: zip RQCalculator.xls.zip (4.0 KB, 9 views)

Last edited by rcheshire; 26-11-2016 at 04:39 PM.
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