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Topic: Capacitor value (Read 536 times) previous topic - next topic

Boardburner2

On a data sheet i see different temp/ voltage figures given for it.

U ndc
U opdc

I cannot find what these mean

Can some kind soul put me out of my misery

DrAzzy

#1
Feb 27, 2016, 01:22 am Last Edit: Feb 27, 2016, 01:23 am by DrAzzy
Can you link to the sheet so I can see a bit of context?

They don't sound familiar...

Also English idiom lesson : "to put someone out of their misery" implies that you're ending the misery by killing them ( like how you might have a sick pet put down). That's probably not what you want us to do..
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Wawa

Seems to be voltage limitation.
http://www.garmanage.com/atelier/index.cgi?path=public&B&Energy_storage&B&Capacitors&B&Voltage_limits&&id=psyitefg
That explains the first part.
I guess the second one is the OPerating voltage.
Leo..

Boardburner2

http://www.farnell.com/datasheets/1812503.pdf

I am building a coating detector, the arduino can do the detection fine but it requires high voltage.

Basically a ht photoflash circuit for hv.

I have to be careful to get the transformer right to keep the photoflash charger happy.

The cap has to be able to handle high pulse discharge currents though.
I am having trouble understanding the ratings of the caps.


Paul__B

Also English idiom lesson : "to put someone out of their misery" implies that you're ending the misery by killing them ( like how you might have a sick pet put down). That's probably not what you want us to do..
It's still a good idiom. :smiley-lol:

krupski

http://www.farnell.com/datasheets/1812503.pdf

I am building a coating detector, the arduino can do the detection fine but it requires high voltage.

Basically a ht photoflash circuit for hv.

I have to be careful to get the transformer right to keep the photoflash charger happy.

The cap has to be able to handle high pulse discharge currents though.
I am having trouble understanding the ratings of the caps.


A xenon photoflash circuit has a very high voltage (350 or more DC) with quite a lot of capacitor behind it. The energy stored in the flash capacitor can be LETHAL.

Please don't take this the wrong way, but with a circuit like that, if you don't know EXACTLY what you are doing.... don't do it. You could very well KILL YOURSELF with a simple mistake.

Please be careful with that circuit... lest you put yourself out of your misery without really intending to.......
Gentlemen may prefer Blondes, but Real Men prefer Redheads!

Boardburner2

Thank you for your kind warning.
I have considerable experience though with high voltage working.
It was my job, (high power transmitters , later gas lasers) for several years.

I am curious about these capacitors though.

The poly caps available are approaching the density of electrolytics now.

Used to be caps with that performance were military only.

Seems that farnell have them but rs do not.

I am wondering what has changed.
And i am still not sure if they are suitable for pulse discharge without damage.

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