>
>
>On Sun, 27 Sep 98 18:36:26 -0800 Rich Measures <measures@vc.net> writes:
>>
>>>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.
>>>
>>>> 105? deg C rated electrolytic capacitors last much longer than 85?
>>C
>>>rated electrolytics. - - I would use 2x 24 Panasonic [Matsushita]
>>>470uF, 450v, 105? 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.
>
Carl writes:
>Identical rated caps made in the USA by CDE are available from Mouser.
>Part # 381LX471M450A052 ( Mouser # 5985-450V470) are $11.29 ea Qty
>10-99.
>
The rating is 85ºC. The Panasonic capacitor is rated at 105ºC. The price on
the CDE cap. is currently $10.21 at 10 - 99 units. .
>These and the Panasonic are good caps but be careful of the ESR and
>ripple current ratings which are signifigantly worse than computer grade
>caps.
The Panasonic caps. are rated for ripple current in the Digikey catalog. .
The CDE computer grade caps are not rated for ripple current in the Mouser
catalog. . Good ripple current rating means low ESR.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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