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From: Phil Allison on 25 Mar 2006 00:32

<acctforjunk(a)yahoo.com>

** Don't top post.

Bad usenet ettiquette.

Looks hostile and offensive.


>> > I finally figured it out. I needed more filtering on Vin. I put a
>> > 0.47 uF right across the power pins.
>> >
>>
>>
>> ** A 0.47 uF what ???
>>
>> The data sheet showed 3 x 15 uF electros.
>>
>> Got them too ?
>
>
> Read my original post: "a 1000uF cap at the input".
>

** Does not answer my question.


> Switchers Made Simple 6.24 specifies a 1000uF cap for nearly any
> voltage/current combination,


** For what ?

100 / 120 Hz ripple filtering ?


> and this will eventually go into a
> variable power supply. The 0.47uF is just for "up close and personal"
> bypassing.


** Again - a 0.47 uF what ??

Film, tantalum, electro ???

If you had a 1000 uF electro fitted close to the device, a 0.47 uF would do
SFA - whatever type.




........ Phil








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