In general I always prefer parallel. Series connections of caps are dicey. First, you'd need bleeder resistors to make sure there is no DC runaway in a few of them. Then, 47uF will have lots of tolerance so that alone with cause uneven voltage levels. Phssst ... POOF ... *BANG*.
"Any commercially available ceramic chip capacitors that when in series approximately totals to 50uF +/-5uF and has a V rating not much greater than 200V."
Or just change that 50 to say 52.
D from BC myrealaddress(at)comic(dot)com British Columbia Canada
Yup.. I'll need 52 bleeder resistors if I'm using 52 chip capacitors in series... That's extra work and space. Just the chip caps alone are ludicrous. However, series might still be the cheaper solution.
I figure a 6x30 array would do it, 6 series banks of 30 paralleled caps, costing about $30.
That's 6 in series rather than 4 to cut the voltage across each, otherwise you're just making the world's largest varactor. Might need more than 6, for that matter.
I also chose a 1210-cased part over the 1206 parts, for the same reason.
"That's 6 in series rather than 4 to cut the voltage across each, otherwise you're just making the world's largest varactor. Might need more than 6, for that matter.
I also chose a 1210-cased part over the 1206 parts, for the same reason."
All things being equal, bigger cased-parts suffer less capacitance loss with applied voltage, and I seem to remember higher-voltage parts suffer less (we had a thread here in s.e.d. a while ago).
How much capacitance is left? The makers almost never say!
4) Taiyo-Yuden JMK105F474ZV-F, 470nF/6.3V, Y5V, 0402 0v 440nF (520nF on first measurement, 440nF after voltage had been applied then removed.) 1v 238nF 2v 134nF 3v 82nF 4v 64nF 6.3v 40nF
Hmmm, Y5V makes *excellent* varactors. I actually have an application for this: a VCO.
But for DC from BC? Probably should use film caps, like John said.
I have a paper somewhere that uses ceramic caps as the active elements in a high-voltage nonlinear transmission line (shock line) pulse sharpener/booster. That suggests the nonlinearity holds up at high frequencies, at least in some caps. Unfortunately, the most nonlinear caps have the worst TCs. Varicaps have rotten TCs, too.
I wish I had a low-TC varicap just now. Varicap TC changes with bias:C, so any compensation must itself be nonlinear. How tedious.
I suppose you could make an audio power amp using ceramic caps as the gain elements. Or a lamp dimmer, stuff like that.
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