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Offline RelicHunter1388Topic starter
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King Cobra [WIP]
« on: December 08, 2022, 09:27:27 pm »
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For ten years, the PCB has been incubating inside a dark drawer.  Now is the time for the King Cobra to hatch.  Let the project begin!


The first quest is to find the parts list for the King Cobra's External Components PCB.  Although a picture of the completed PCB and its connections is provided in the documentation, no parts list seems to be available.  For that, I need your directions.


The second quest is to acquire knowledge as to how electronic components work.  For that, I require your guidance.

• A. Some parts have the same stats but their serial numbers have different indicators (e.g.: "A", "B", "C", etc.).  Are they newer versions of the same part?
• B. The Capacitor type is not specified for most parts.  What is the best option?
• C. For mounting some of the transistors, special "docks" are soldered on the PCB.  How are they called?
• D. What happens if I install the parts not installed on the original PCB?



Thank you all in advance for sharing your wisdom!


Photos of the PCBs have been attached.

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« Reply #1 on: December 09, 2022, 07:08:51 am »
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looks like that some components are smd.
do you have the schematics for the board??
can you post them pls

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Offline RelicHunter1388Topic starter
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King Cobra [WIP]
« Reply #2 on: December 09, 2022, 08:01:50 pm »
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I have the two compressed archives by Eugene52 that contain the CAD2006 model by NE555 (I don't have the software to view it), and also some reference pictures.  There is supposed to be a third archive in the making, but it has not been posted yet.


Both can be found here in this forum:

Part 1

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http://www.thunting.com/smf/vlf_designs/king_cobra_part_1-t62469.0.html


Part 2

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The PCB silkscreen and some schematics can be found here:

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http://www.thunting.com/smf/vlf_designs/new_king_cobra_15_khz_vlf_project_for_2016-t62419.0.html


More precisely, this post:

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http://www.thunting.com/smf/index.php/topic,62419.msg308101.html#msg308101


This also:

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http://www.thunting.com/smf/index.php/topic,62419.msg315125.html#msg315125


And the PDFs by NE555 are on this post:

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http://www.thunting.com/smf/index.php/topic,62419.msg327546.html#msg327546



EDIT

I found what is happening with the bottom side of the main PCB.  Had to register on Geotech and find the original development thread. 
You can see it here (requires having a free account):

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https://www.geotech1.com/forums/showthread.php?16172-King-Cobra-PCB/page4&highlight=king+cobra


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« Last Edit: December 09, 2022, 08:21:18 pm by RelicHunter1388 »
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« Reply #3 on: December 10, 2022, 12:47:14 am »
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Ne555/KT315 is also a member here.the board that you have is his.
he is the best person to give you support
i was asking about the shematics just to make sure you have KT315's version
before redirect you to geotech  Smiley

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Offline RelicHunter1388Topic starter
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King Cobra [WIP]
« Reply #4 on: December 10, 2022, 06:10:23 pm »
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The PCB came indeed from NE555/KT315.

Thank you!  I will try to contact him there.


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