Confusion on capacitors

Started by Skulduggery, July 17, 2009, 01:42:10 AM

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Skulduggery

I'm building a very simple treble booster, and I've run into some confusion with the capacitor..er..capacitance.

The schematic clearly says 2nf, which I am pretty sure means .002 uF, correct? However, I can't find this capacitance anywhere, not even mouser. Is it possible to substitute the caps with, say two .001 uF caps in parallel? series? Or can I just put .0022 uF in there and no sweat it at all?

Thanks for the help, it's just such a pain having to order from 5 different online shops to get the parts I need for one pedal. Shipping alone  :P

BAARON

#1
2nF means 0.002ųF, yes, and if they Do exist, they're definitely not common.  2.2nF will do just fine: most caps in that size range have a tolerance of ±10% (or thereabouts) anyway.

Ordering from 5 shops, eh?  You could try ordering from One shop... www.SmallBearElec.com probably has most everything you need, to state one example.
B. Aaron Ennis
If somebody makes a mistake, help them understand what went wrong.  Show them how to do it right.  Be helpful.  Don't just say "you're wrong, moron."

Skulduggery

Quote from: BAARON on July 17, 2009, 01:50:44 AM
2nF means 0.002ųF, yes, and if they Do exist, they're definitely not common.  2.2nF will do just fine: most caps in that size range have a tolerance of ±10% (or thereabouts) anyway.

Ordering from 5 shops, eh?  You could try ordering from One shop... www.SmallBearElec.com probably has most everything you need, to state one example.

Thanks. And I love Small Bear, it's my knob heaven. However any conversion chart I find doesn't seem to explain where "mf"s fit into the scale of things, and that's all SmallBear lists their caps as.  ???  I'm so wet behind the ears I might fry my circuits anyway.  :icon_lol:

Skulduggery

Yes nevermind, they are the same thing, huh.

davent

"If you always do what you always did- you always get what you always got." - Unknown
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Mike Burgundy

Quote from: Skulduggery on July 17, 2009, 01:59:12 AM

However any conversion chart I find doesn't seem to explain where "mf"s fit into the scale of things, and that's all SmallBear lists their caps as.  ??? 

This confusion crops up every now and then, see http://www.smallbearelec.com/Ordering/ProdFAQ.htm , under the header "capacitors".
mF *officially* is milli-Farad, but since there's no "mu" on a western keyboard,microFarad is often written as mF. Most people here use the uF which kinda looks like a "mu". Smallbear however uses mF, so a 1mF=1uF=1μF=1000nF.
Hope it helps!

Top Top

Here is a cap chart I use to help myself be less confused about all the abbreviations and conversions :)

http://www.justradios.com/uFnFpF.html

R O Tiree

Press and hold the ALT key while you type 0181 on the number pad, then let go of the ALT key... µ
...you fritter and waste the hours in an off-hand way...

Paul Marossy

Quote from: Top Top on July 18, 2009, 08:25:35 PM
Here is a cap chart I use to help myself be less confused about all the abbreviations and conversions :)

http://www.justradios.com/uFnFpF.html

That's the same one that I printed out and refer to all the time.