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OVM14 MkIII, rev P2

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nuckolls.bob(at)aeroelect
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Posted: Wed Oct 25, 2023 10:29 am Post subject: OVM14 MkIII, rev P2

The upgrade to the AEC9003 CBOV Module has not been

 laying dormant. I've been working the ECB layout which

 is by necessity, a multi-day task. It might take me

 a few hours to do a first pass on the layout but then

 I need to put it down for a day or so and come back

 for an integrity check.  If any 'bugs' identified,

 fix'em and set it down again to 'mature'. If the

 next check is good, I can do an ECB fabrication paste

 up. Day later, check one more time and get a quote

 on the first fabrication order. In this case, I can

 get 45 boards on a 'proto' order. Double sided, plated

 thru, tin-lead plated traces, solder masked both sides

 for $90. That comes out to $2 per board. Fair 'nuf.



 I've posted the documents to the website at:



  http://aeroelectric.com/AEC_Legacy_Products/9003/AEC9003%20MkIII%20Check%20Drawings.pdf

 

 

 Anyone adept at 500-piece jigsaw puzzles will find

 this 20-piece puzzle no big deal. Any assistance

 with making sure it wasn't a foggy day at this

 end is appreciated.



 I'll get an order in for the boards along with one

 to Digikey for parts not already on hand. We should

 have parts on hand for first production proof

 batch by end of next week.



 Need to go to Wichita next week. I'll pick

 up my loaned out environmental chamber.

 We'll want to get a look at temperature

 effects on performance of the first articles.



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

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Eric Page

Joined: 15 Feb 2017
Posts: 247

Posted: Wed Oct 25, 2023 6:29 pm Post subject: Re: OVM14 MkIII, rev P2

 	  nuckolls.bob(at)aeroelect wrote: 	
		  Any assistance with making sure it wasn't a foggy day at this end is appreciated. 	


It looks to me that the layout matches the schematic perfectly.  Just a few comments to offer:

 Suggest not placing vias within the borders of SMD pads unless the they'll be filled with copper (at most board fabs, that's a high-cost option).  As-is, the vias will tend to wick solder away from the components and may produce poor soldering results.



 Are you planning to remove the middle leg of the SCR and surface-mount the part?  If so, there will be a trace and vias, connected to MT1, sitting directly under the MT2 tab.  Unless the vias are tented, the one at the end of that trace will put exposed copper under the exposed tab, possibly touching.



 It appears that the wires will be soldered to surface pads.  I tried that once and it didn't take much effort for the wires pull pads off the board.  Suggest using through-holes to attach wires -or- put drilled holes near the pads so that the wires can pass through the board from top to bottom for mechanical support before soldering.

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