Author Topic: CAPACITORS?  (Read 1243 times)

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Offline vdemonTopic starter

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« on: August 16, 2009, 04:45:28 PM »
I am currently building a a SAMrI sumo robot but i can't figure out if which lead is negitive the longer one or the shorter one, on the electrolytic capacitors? And the same goes for those 104 (0.1 uF) monolithic capacitors (i.e. the things that look like yellow candies on sticks) the instructions on the kit say to just put them in, so does is matter which way it goes in? ??? 


Offline Soeren

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« Reply #1 on: August 16, 2009, 05:10:51 PM »

Electrolytic capacitors will have the negative side marked with a "-" sign.
The negative side is the one connected to the aluminum can enclosing it and the positive side is connected through a "rubber" disc.

The 100nF (0.1µF) is a non-polarized component, so in most cases goes in either way - the rare exception is with some foil capacitors, where the pin going to the outer layer is marked, enabling it to be grounded (as shielding) in highly critical circuits handling very low signal amplitudes.

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline Admin

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« Reply #2 on: August 18, 2009, 01:04:15 PM »
The shorter lead is negative.

Just think:
+ has two lines
- has one line

+, positive, with more lines, added together, is longer

. . . at least thats how I always remember :P

Offline dual

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« Reply #3 on: August 18, 2009, 01:48:14 PM »
Electrolytic Capacitor
there are two ways you can look at it. There is a side of the capacitor that is painted black and would have a (-) negative sign on it. Otherwise, the longer side is Positive, this is true for most circuit elements.

Monolithic Capacitor
there is no polarization for this kind so it does not matter which terminal goes where.


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