Equivalent capacitor

Hi Chibutul...

I think I'd much sooner see two 17's in series...

However, two caps in series isn't nearly as efficient so while you're rounding, round up.

Which may (probably will) leave you with linearity problems, so were it my set I'd keep on looking for a 34 at greater than 100 volts.

Take care.

Ken

I think Ken meant "two 17's in parallel".

Hi Travis...

Arghhh. Very kind of you, but I just goofed. Silly old stroke damaged guy here.

Forgot that series capacitance is the reciprocal of the total of the reciprocal of each cap in the series.

Have to learn to think more, and type less :)

Apologies to the op, and to all.

Ken

Why not just go for 47µF 100v? They're common enough, and electrolytics are rarely critical in size.

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Absolutely agree...... a most common value of 47uf @ 100V should work perfectly in almost all applications calling for 35 uf @ 100V

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Could work, depending on the circuit it is mounted. When you put electrolytic capacitors (Aluminium, Tantalum, ...) in series you must put resistors in parallel in order to compensate the leakage currents (10 times the leakage current value in the resistors) and balance the transient voltages. If you don't do that, the first time the voltage is applied to the two caps, each capacitor won't see the same voltage and the rating may be exceeded. Shall I remind you that an overloaded capacitor may explode ?

Better to wait for the good value.

"chibitul" a écrit dans le message news: snipped-for-privacy@g44g2000cwa.googlegroups.com...

47 UF/100 Volts $0.35

N

OK, we know you meant parallel. :)

It's not the efficiency or linearity that would be the main issue with capacitors in series. The problem is that if the leakage resistances and capacitances are not the same, the voltage across the two caps with not be equal. So, use a higher voltage to be on the safe side if the application really requires close to the working voltage.

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Just in case you are ignoring your earlier post, and sorry to nag...you likely want 100uF, 35V.

Tom

Yes Tom, thanks again. I do not ignore my threads, then why would I ask here the experts? I made a mistake, now I found the exact capacitor and I would like to install it but my wife has other plans for the evening... well, tomorrow (maybe).

Thanks again, and BTW, you better "nag" than let someone stupid like me install the wrong capacitor.

"Tom MacIntyre" bravely wrote to "All" (13 Jul 05 21:32:12) --- on the heady topic of "Re: Equivalent capacitor"

TM> From: Tom Mac >Hi, >

TM> Just in case you are ignoring your earlier post, and sorry to TM> nag...you likely want 100uF, 35V.

Tom,

That is exactly what I was going to say. 35uF is a pretty oddball capacitance value but 35 WVDC is a very common voltage rating. Hey, who ever heard of a 17uF electro anyways, (besides the weird old Philips stuff from Europe), ?

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:-)

Tom

yes

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