[eagle] Re: CAN-Do-Too!

Chuck Green greencl at mindspring.com
Mon Jul 16 19:50:12 PDT 2007


470 uH
Chuck

Jim Sanford wrote:
> 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
>>>>
>>>>       
>> _______________________________________________
>> Via the Eagle mailing list courtesy of AMSAT-NA
>> Eagle at amsat.org
>> http://amsat.org/mailman/listinfo/eagle
>>
>>   


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