>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
>http://www.contesting.com/Tours/W9JA/w9jahome.htm
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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