[Test-Equipment] Question about series/parallel capacitors

[J. Forster]

See my prior posts, but you also might aqlso try some of those selling
caps to Audiophools for "premium" capacitors.

-John

===============


>
> Connecting capacitors in series is NOT a good idea,
> because at each point in time, each cap leakage
> will be different, so the voltage across each cap
> in the string will be different and could easily
> be higher than the rated voltage for that cap.
> Voltage equalizing resistors in parallel with each
> cap will be seen by the circuit as cap leakage, that
> in many applications (including bridges) is not
> acceptable.
>
> The solution is a single cap, of the required
> characteristics (capacitance, tolerance, temperature
> dependence, voltage, max leakage, etc.).
>
> -- Ron
>
>
>
>
> --- On Fri, 5/13/11, Barry <n4buq at knology.net> wrote:
>
>> From: Barry <n4buq at knology.net>
>> Subject: [Test-Equipment] Question about series/parallel capacitors
>> To: test-equipment at mailman.qth.net
>> Date: Friday, May 13, 2011, 6:59 PM
>> I need a 0.5uF capacitor that's
>> capable of handling 600VDC.  I have several 0.5uF that
>> are rated at 250V so I plan to connect them in
>> series/parallel to get 0.5uF at 750V.
>>
>> The question I have is does it matter how these are
>> connected?
>>
>> I have the choice of:
>>
>> A. Connecting three sets of three capacitors each in
>> parallel to produce 1.5uF and then connecting the three sets
>> in series yielding 0.5uF.
>>
>> or
>>
>> B. Connecting three sets of capacitors in series and then
>> connecting the resulting 1/6uF capacitors in parallel to
>> again make 0.5uF.
>>
>>
>> Both methods will give me 0.5uF but it I'm wondering if one
>> way has any advantages.
>>
>> Any thoughts?
>>
>> Thanks,
>> Barry - N4BUQ
>>
>>
>>
>>
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