[ARC5] Back to basics: Capacitor breakdown voltages

[Richard Knoppow]

     How much voltage actually exists at this point? Make sure to 
include ripple voltage.  In general the voltages add, i.e. 2 1KV caps in 
series equal a 2KV cap.
     The 2KV caps may be sufficient if the voltage with ripple is well 
below this.
     Usually, equalizing resistors are needed only for electrolytic 
caps, not paper or plastic film caps.

On 1/24/2016 6:14 PM, Jim Falls wrote:
> OK, I can calculate series/parallel combos, but how does the breakdown voltage work?
>
> My BC -375 has a leaky trio of 1uF oil filled bypass caps that have 3kV ratings. Mouser has pricey ($20) 1uF and .47uF units rated at 2kV. How does that breakdown work?
>
> One shorted, and the plate current meter went up like a sparkler. Other 2 are making my PSU lug down, B+ dropping to 900 from the usual 1100 VDC it idles at. I get 800 while transmitting instead of 1kV like it usually does.
>
> Cheers!
> Jim K6FWT
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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