--- In microelectricitygermkiller2@yahoogroups.com, Don Hildreth
<w6nrw2@...> wrote:
>
> What you say would be true for 'normal' capacitors in
> series, but the approximate equivalent circuit of an
> electrolytic capacitor is usually given as a capacitor
> in parallel with a diode. Thus the effective capacity
> would not be half. (I'll admit that I have never made
> any detailed analysis to confirm that equivalent
> circuit in great detail)


Well - it's not 'usual' but is a reasonable approximation -
when you account for the monumental amount of reverse
current leakage - enough to kill the operation of 555's - &
still pass factory specs.

Joe.


>
> --- Bella Lugosi <batzcuz@...> wrote:
>
> > Thanks Don...for bringing it up, but you're missing
> > Detail~
> > CAPs in Series, function like RESISTORs in
> > PARALLEL!
> > [If 2 equal R's in parallel, or equal C's in
> > series, gives 1/2]
> >
> > If you want to make a 10-mfd (NP) CAP, you will
> > need to
> > wire two 20-mfd Polarized Caps in Series
> > (back-to-back).
> > Placing two 10-mfd caps in series...will yield,
> > only 5-mfd.
> > Some (audio-freq/low signal) applications are not
> > critical,
> > and while nice to get NP performance...reality
> > prevailes?
> > Power-distribution & motors DO-NOT use
> > non-polarized!
> >
> > Most electrolytic caps, were manufactured with
> > negative
> > connection to the outside of the caps physical
> > package,
> > which is best in HVDC applications with case
> > grounded.
> > It's not wise when placed in series (floating) no
> > grounds!
> > Ok, my point being...wire 2 caps (-) to (-)...not
> > (+) to (+),
> > which helps to isolate, contacting outer (-) can =
> > zaps..!
> >
> > Also note, if two Caps are equal-capacity (not
> > likely) you
> > can then operate new/(NP) series combo-caps, at
> > higher
> > WVDC/(operating-voltage) than original cap
> > specification.
> > For safety reasons, cap cannot be assumed to be
> > same
> > capacity of any other-caps that it is being
> > paired-up with.
> > As a ckt. designer, if I placed 2 (35-wvdc) caps
> > in series,
> > then might run combos...up to maybe 50-vdc...not
> > to 70!
> >
> > FYI: If CAP VALUES are NOT EQUAL, then for SAFETY
> > in AC (signal) voltage distribution...never
> > exceed, WVDC
> > values identified for the lowest capacitor in
> > series-string!
> >
> > Hope my simplified (equation free) version, was
> > helpfull?
> > Parallel Caps/(Series Resistor) math is very
> > simple, but
> > equations are not that easy to represent here via
> > typing.
> > [Refer to any elementry electronics book, with
> > formulas]
> >
> > ^BATZCUZ^
> >
> > P.S. I know, thinking what does some little BAT
> > know,
> > about electronics theory...(LoL) we had SONAR
> > First...
> > took humans eons to discover Batz (midnight)
> > Secrets.
> > ========================================
> >
> > Don Hildreth <w6nrw2@...> wrote:
> > Just because I haven't seen it mentioned here.
> > And just because there may be thousands of polarized
> > electrolytic capacitors out there for every
> > available non-polarized (NP)electrolytic capacitor,
> > the following is what to do to make an NP
> > electrolytic
> > if you only can find the polarized kind: Put two (2)
> > equal value polarized Cs in series in polarity
> > opposition. That is, connect the two + ends or the
> > two minus ends together to get the series pair.
> >
> > BATZ: Connecting (-) to (-)
> > Safer/(More-Betterest-?)!
> >
> > The resulting non-polarized C is equal to one of the
> > pair and the combination is non-polarized.
> >
> > BATZ: This (new) series C+C capacitor is NOT=C...
> > it's C/2 = half of what you strated out with,
> > trust Bat/
> > also this only holds true if both caps are equal
> > "C"~!
> >
> >
> > __________________________________________________
> >
> >
> >
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