08-10-2016, 11:50 AM
+1 Russ
>Can I get away with using 2 - .002 mfd 630v in parallel ? I seem to remember that the voltage rating doubles, is that correct?
No, If you place two .002 mfd 630v caps in parallel what you get is .004 @ 630v. With caps that are the same capacitance in parallel the capacitance adds but the voltage rating stays the same. If the two caps have different voltage ratings then it's only good for the voltage rating of the lower rated cap.
In two series of the same capacitance will divide in half and the voltage rating adds. So if you had two 40mfd @ 450v caps in series the total would be 20mfd at 900vdc. When you two caps that are in series or parallel that are different capacitance the total must be calculated with the proper formula.
#19 has got a lot of ac spikes on it from the vibrator/power transformer that's why it has a 1.5kv rating, I would try to stay at that voltage rating or higher. Disk ceramic maybe a good choice @ 1.5 or 2kv.
GL and have Fun!
>Can I get away with using 2 - .002 mfd 630v in parallel ? I seem to remember that the voltage rating doubles, is that correct?
No, If you place two .002 mfd 630v caps in parallel what you get is .004 @ 630v. With caps that are the same capacitance in parallel the capacitance adds but the voltage rating stays the same. If the two caps have different voltage ratings then it's only good for the voltage rating of the lower rated cap.
In two series of the same capacitance will divide in half and the voltage rating adds. So if you had two 40mfd @ 450v caps in series the total would be 20mfd at 900vdc. When you two caps that are in series or parallel that are different capacitance the total must be calculated with the proper formula.
#19 has got a lot of ac spikes on it from the vibrator/power transformer that's why it has a 1.5kv rating, I would try to stay at that voltage rating or higher. Disk ceramic maybe a good choice @ 1.5 or 2kv.
GL and have Fun!
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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