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donutty
Joined: 16 Feb 2008
Posts: 1122
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 Posted: Sat Dec 06, 2008 4:55 pm Post subject: Military hybrids |
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Military Thermal Imaging PCB (Marconi Avionics Limited).
All ICs and hybrids are socketed.
Anybody know what they are??
Underneath all the hybrids have thermal paste, so they must generate quite a bit of heat. The whole PCB is metal clad and acts as the heatsink.
Higher resolution: http://www.nitrate.plus.com/Files/Pics/L6A1_hybrids.JPG |
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hugo929
Joined: 27 Oct 2006
Posts: 6163
Location: China
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| Posted: Sat Dec 06, 2008 7:55 pm Post subject: |
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I have never get connected to nitrate.plus.com. possibly been blocked by firewall as well 
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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Guest
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| Posted: Sat Dec 06, 2008 10:08 pm Post subject: |
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 Bloody cool board, Adam!
Can you sell any of these to members?  |
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johnorun
Joined: 04 Apr 2008
Posts: 3364
Location: Chicago, IL- US
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| Posted: Sat Dec 06, 2008 10:09 pm Post subject: |
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My message above---darn Login...  |
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donutty
Joined: 16 Feb 2008
Posts: 1122
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| Posted: Sun Dec 07, 2008 6:07 am Post subject: |
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| Hugo - does that mean you can't see the picture above? If so, I'll put the pictures somewhere else. |
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donutty
Joined: 16 Feb 2008
Posts: 1122
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| Posted: Sun Dec 07, 2008 6:24 am Post subject: |
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| CPUShack wrote: | | I kinda wonder if thr RCA part isnt a custommarked 1802? and a ROM next to it. |
If I had a COSMAC board, I'd test it!
Maybe I will reference it against an 1802 and check the resistances across pins to at least get some idea. That gives me an idea for an IC cross-referencing tester:
Using a microcontroller and and ADC, you put the reference IC (the one that you know is a genuine article) in the socket and the uC reads the resistances from each pin to the next (or from GND to each pin) and stores them. You take the reference chip out and put in the 'unknown' one. The same test is repeated and the results compared (within a certain percentage margin either way).
What do you think? |
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Sun Dec 07, 2008 8:36 am Post subject: |
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| donutty wrote: |
If I had a COSMAC board, I'd test it!
Maybe I will reference it against an 1802 and check the resistances across pins to at least get some idea. That gives me an idea for an IC cross-referencing tester:
Using a microcontroller and and ADC, you put the reference IC (the one that you know is a genuine article) in the socket and the uC reads the resistances from each pin to the next (or from GND to each pin) and stores them. You take the reference chip out and put in the 'unknown' one. The same test is repeated and the results compared (within a certain percentage margin either way).
What do you think? |
Sounds good, you should also test all pins against
Vcc to identify tri-state outputs and other specialities...
I normally do this job manually with a multimeter,
diode-testing position to have at least 2Volts for checking.
Made very good experiences and this is way better than
scrapping any very rare 1802-running device by
putting in an unknwon millipede....
Cute board! 
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