Capacitor Quality
Capacitor Quality
(OP)
I have got capacitors of two different brands. I used multimeter and found that both are of same Farads i.e. (10 micro Farads).
How can i find which one is of better quality?
Thank you.
Regards,
E
How can i find which one is of better quality?
Thank you.
Regards,
E
RE: Capacitor Quality
RE: Capacitor Quality
Bear in mind that purity of capacitance is a different measure of quality than physical construction - some very good capacitors in terms of low parasitics are a nightmare in assembly.
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If we learn from our mistakes I'm getting a great education!
RE: Capacitor Quality
There is no passive component with more aspects to be considered by a user than a capacitor.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
That was my thinking Skogs..
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
So, I (and I really hope that you get my tounge-in-cheek) maintain that there are many more dimensions in the decision space whan it comes to capacitors than any other component.
As I said, I could have argued that way. But I didn't really.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
Capacitors are stuck with only 2 wires coming out. A huge handicap in the battle of complexity.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
Just you wait!
Sorry, haven't got the time right now.
Will surely be back. Be prepared!
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
But. Any computer guy can probably select a micro - can he select a capacitor?
Why is that so?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
When I was teaching some analog comm labs at Purdue, I was careful about not leaving out those kinds of details. While I may not have covered everything, I tried to stress that there are always a myriad of specs one might need to look at that aren't necessarily obvious to the average engineer. As it is, I still need to pull up Google and refresh my memory on the different cap types any time I start work in a "field" I haven't worked in for a while (such as audio, video, RF, etc.).
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Capacitor Quality
"there are always a myriad of specs"
I like that. That's a lot more than your measly 250!
(A myriad is 10 000)
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
I had a real killer ready for you if you had even thought about using that leg argument. Wish you had...
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
Friends always man.
Legs?? = Leads?? Out with it! Lets hear it.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
Which one is the more complex organism? A human (two legs) or a centipede?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Capacitor Quality
RE: Capacitor Quality
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
If the capacitance value is right and have chosen the lowest ESR, you have pretty much answered the looks and sounds like a duck question. Given that it is a black box choice and the poor framing of the question.
RE: Capacitor Quality
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Capacitor Quality
http://www.engineeringhumor.com/Theorems01.htm
RE: Capacitor Quality
Agreed that the caps must be ESR tested if they are intended for apps at frequencies far from DC.
Honestly, for most applications (<1MHz, ambient temperature, etc.), I used X7R type ceramic chip caps, mainly because those are easier to find on Digikey or Mouser. Yes, it is not a very technical way to choose parts.
For tough environments like field devices, I use NPO type caps, that offer less capacitance drift over time/temperature.
For higher frequency applications, like PS filters, switching stages or analog, I choose tantalum or those marked by the manufcturer as 'Low ESR'. They are more costly , but save lots of problems on field.
Regards,
Gonzalo