[ARC5] Back to basics: Capacitor breakdown voltages

[hwhall at compuserve.com]

Do you have a particular physical configuration you need/want?

Try looking for caps with 1.9 to 2.2 uF and 1500 to 2000 VDC ratings. Two of those in series would get you pretty close to 1 uF and also 3KV plus.

Mouser # 505-SM2.2/1600/5A1 is 2.2uF & 1600VDC. $29 each & available in small quantities. Its weird looking though.
 
 

 Wayne
WB4OGM

 

-----Original Message-----
From: WA5CAB--- via ARC5 <arc5 at mailman.qth.net>
To: arc5 <arc5 at mailman.qth.net>
Sent: Sun, Jan 24, 2016 8:46 pm
Subject: Re: [ARC5] Back to basics: Capacitor breakdown voltages


Ideally, voltage ratings of capacitors in series add.  Although it only comes close to working with capacitors when both are both the same capacitance and voltage rating.  So in order to replace a single 1 ufd 3 KV capacitor with 1 ufd 2 KV units would require four of them and would result in a 1 ufd 4 KV capacitor assuming all four were close to identical.  To replace all three of the originals would require twelve.  Not an economical solution.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 01/24/2016 20:14:35 PM Central Standard Time, radio-tuber at att.net writes: 

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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