[AMPS] Series Parallel Electrolytics & Current

[Rich Measures]

>Hi Rich
>
>I am sure I am just missing something but what are the DIGI-KEY part # for
>the 105 degree 470uF Caps. ......

P10170-ND.    Thanks for the heads up, Paul.  I intended to put this in the article.  
>
>> 105º deg C rated electrolytic capacitors last much longer than 85º C
>rated electrolytics.  -  -   I would use 2x 24 Panasonic [Matsushita]
>470uF, 450v, 105º C rated units in series parallel. This would deliver
>about 40uF @10.8kWV.  I would use one 100k ohm, 3w equalizer resistor
>across each pair of paralleled 470uF units.  It is my opinion that for SSB
>operation, less C would work ok.  Also, I would mount the individual
>electrolytics on a 7mm or more-thick acrylic sheet with silicone rubber adhesive to reduce
>case stress.   (Digikey currently sells these caps. at c. $12.20 each in
>10 unit quantities.)  
>>
rong.  Current pricing is $13.85 ea.  for 10 - 99 units.

>>> Oil capacitors are
>>>hard or too expensive to find. The Current rating of most
>>>electrolytics are around 1 amp, how would they operate at this current?
>>
>> At 3A on RTTY,   Hot.  The solution is to use paralleled units to divide
>the ripple current burden.  It's not a bad idea for electrolytics to be
>mounted with air gaps and to use a bit of forced air cooling.    
>>>
>>>
>>-  later, Igor
>>
>>
>>Rich. Measures.  Web site:  www.vcnet.com/measures
>>
>>
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>> 
>Paul J Hellenberg W9JA ex KS9K Tru Line Lithographing Inc.
>PO BOX  565      7900 Durand Av., Sturtevant WI 53177-0565
>414 554 7300 -125    Fax 414 554 8217    Home 414 554 9170
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Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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