[Heathkit] SB-610 Selenium Diodes - caps across silicon diodes.

Kim Herron kherron at voyager.net
Mon Jul 4 18:05:41 EDT 2005


Hi Gang,
>But .... what's SAFE about putting a 1 or 2W resistor rated at 500V across 
>a diode that sees 800-900 PIV?  Or the roughly 8 Watts  _peak_
>dissipation in those same resistors? The caps don't hurt anything, _AS 
>LONG AS_  they are rated for at least 1000VDC.
>Mike,W8KRR wrote:
>>Still say "better safe than -"
>>Mike

         Not to create an argument here, but I agree with Garey, and just 
to add this:  I haven't put resistors and caps
across diodes for at least 15 years, for just this reason.  Things change, 
and you are supposed to adapt when they do.
It goes along with discussion that occurs every 6 months to a year about 
reforming old electrolytic caps and reusing
old paper caps.  The current wisdom on the subject says (and that mil paper 
sited here a while back agrees) PITCH
the junk, but it's still a discussion.  BTW, in the Heath scopes under 
discussion, there ain't no room for resistors and caps,
unless you want to create a voltage flash over condition to the 
chassis.  The diodes will work just fine without the extra components
and adding them will create more of a likely problem then leaving them out.


Thanks!!

Kim Herron  W8ZV
1-616-677-3706
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