[eagle] Re: CAN-Do-Too!

Jim Sanford wb4gcs at amsat.org
Mon Jul 16 19:32:53 PDT 2007


What is the value of the inductor at hand?
Jim


Chuck Green wrote:

>Hi Juan,
>
>I think you are referring to an e-mail I sent out. It was simply a 
>suggestion to verify the hypothesis that the power supply is in a low 
>power idle mode and hence the 5kHz you were seeing. It really doesn't 
>matter if someone is going to redesign the power supply anyway.
>
>I don't have any shielded inductors to send you. There may not be any 
>such thing in the same footprint as the inductor used. But even if it 
>has to be cobbled in somehow, it would be a good test to run. If anyone 
>has such an inductor, or knows the part number of such a device, it 
>might be worth getting one. But again, if someone is going to redesign 
>the power supply anyway, I would assume they will at least use a toroid, 
>and possibly a shielded one.
>
>Chuck
>
>Juan Rivera wrote:
>  
>
>>Chuck,
>>
>>I seem to recall that you wanted me to try loading down the CAN-Do 
>>switcher to see if the frequency went up. Was that you? I can’t find 
>>the email. If it was, what additional load do you want me to apply? 
>>And are you going to send me some shielded inductors to test? Let me 
>>know and I’ll jump on it for you.
>>
>>73,
>>
>>Juan
>>
>>------------------------------------------------------------------------
>>
>>*From:* eagle-bounces at amsat.org [mailto:eagle-bounces at amsat.org] *On 
>>Behalf Of *Louis McFadin
>>*Sent:* Monday, July 16, 2007 6:10 PM
>>*To:* Chuck Green
>>*Cc:* Dave Black ((Work)); Dave Black ((Home)); David Smith; AMSAT 
>>Eagle; Samsonoff at Mac. Com; Juan.Rivera ((Work))
>>*Subject:* [eagle] Re: CAN-Do-Too! ??????????
>>
>>Chuck,
>>
>>Mouser has a very large selection of D-sub connectors including the 
>>high density versions. Most are in stock.
>>
>>I see no inherent reason for not using them.
>>
>>Lou McFadin
>>
>>W5DID
>>
>>w5did at mac.com <mailto:w5did at mac.com>
>>
>>
>>
>>On Jul 16, 2007, at 7:19 PM, Chuck Green wrote:
>>
>>
>>
>>I have had one experience with the high density D connectors. They 
>>were much larger pin count than 9 or 15! After someone absolutely 
>>insisted that we use them I did the board lay out. Turned out that 
>>they were *totally* unavailable!!! I did the board layout again@#$%&^* 
>>using standard Sub-D's. That was a number of years ago so I would hope 
>>things have changed. If someone is absolutely confident they can 
>>obtain the parts we need then I'm not at all opposed to using them 
>>(remember, I'm not volunteering to do parts procurement for this 
>>project; this is a good time to use someone that's good at parts 
>>procurement).
>>
>>While at Goddard for P3D vib test I noticed NASA satellites using 
>>standard Sub-D's. That was also a few years ago. Anyone know of High 
>>Density Sub-D's being used on other satellites?
>>
>>Chuck
>>
>>Bdale Garbee wrote:
>>
>>    
>>
>>>On Tue, 2007-07-10 at 09:02 -0700, Chuck Green wrote:
>>>
>>>      
>>>
>>>>The sub-miniature D connector series has served us well. If anyone 
>>>>has *experience* with something they think might be a better choice, 
>>>>we'd love to hear about it.
>>>>
>>>>        
>>>>
>>>At the AMSAT annual meeting that was held near Washington, D.C., a
>>>
>>>couple of years ago (three?), someone approached me after the CAN-Do!
>>>
>>>talk that Stephen and I gave to ask why we weren't using the
>>>
>>>higher-density connectors that put 15 pins in the same shell size as the
>>>
>>>9-pin version of the series we have been using... and followed up by
>>>
>>>sending me what looked like mil/aero-spec samples of such a part that I
>>>
>>>probably still have in my basement somewhere. I'm sorry that I can't
>>>
>>>recall at all who that person was, but it was someone who claimed to be
>>>
>>>using such connectors professionally with good results.
>>>
>>>At the time, we weren't likely to be redesigning the units any time
>>>
>>>soon, so I didn't take any action on this suggestion. If we're going to
>>>
>>>revisit the design and think we need more than 9 pins, it might be worth
>>>
>>>investigating higher density connectors like that?
>>>
>>>Bdale
>>>
>>>      
>>>
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>
>  
>
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