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4hv.org :: Forums :: General Science and Electronics
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stray inductance of metal film caps.

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Patrick
Tue Jan 10 2012, 10:11AM Print
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
does this type of cap have significant inductance?
I know they're made via rolling up film and foil, but can i tell if the ends are folded over to reduce inductance?
2264681w345
let me break one up, maybe ill see?
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radiotech
Wed Jan 11 2012, 03:23AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
I think you will find it has the inductance of a block of aluminum of the same size.

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Patrick
Wed Jan 11 2012, 05:30AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ive broken them apart, and it looks like the green polyester ones are just rolled up with high inductance.

But the orange, brown and red ones i have are all mettalized at the ends where the leads meat all the plates, and so are low inductance.
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Sulaiman
Wed Jan 11 2012, 01:55PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If possible find a datasheet for the capacitor as it will either state esl (equivalent series inductance) or give graphs of impedance vs. frequency.
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Pinky's Brain
Wed Jan 11 2012, 07:07PM
Pinky's Brain Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Patrick wrote ...

does this type of cap have significant inductance?
If this is for your divider and you want to get to say 50 MHz then the leads have significant inductance regardless of the internals.
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Patrick
Wed Jan 11 2012, 07:11PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Pinky's Brain wrote ...

Patrick wrote ...

does this type of cap have significant inductance?
If this is for your divider and you want to get to say 50 MHz then the leads have significant inductance regardless of the internals.
yes im planning to simulate some 10nH values to see what happens. also i may switch over to Dan McCauley's circuit...
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