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capacitor question...

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Nickk2057:
hello... i was wondering what type of capacitor this is... trying to find out the type it is so i can make the french inverter circuit... any ideas.. so i can go to the parts store to get it

IanB:
The circuit symbol just indicates an unpolarized capacitor.

To know what kind of capacitor is best in that circuit needs information about the circuit as a whole, a recommendation from the circuit designer, or details in the parts list or circuit description.

If in doubt, just use any small unpolarized capacitor of that value and with a suitable voltage rating.

amspire:
It is not polarized, so it is almost certainly a low esr ceramic 2.2 microfarad capacitor.

If you have any dead PC motherboards lying around, it will be full of 1uF surface mount caps and probably 10uF ceramic caps (the big ones), so you can pinch it them from there. Perhaps some 2.2uF as well, but there capacitors are not particularly accurate, you can replace a 2.2uf ceramic with two 1uF caps in parallel.

How can you tell the value? If you do not have a capacitance meter, get a 9V battery and a 1Meg resistor. Put a multimeter across the capacitor. Connect the capacitor and resistor together. The other end of the capacitor goes to the battery negative. The other end of the resistor goes to battery positive.

If the voltage across the capacitor rises from 0V to 6V in just over 1 second, it is 1uF. A bit over 2 seconds it is 2uF. A bit over 10 seconds it is 10uF. These capacitors can easily be out by over 20%  - it doesn't matter when used for decoupling or filtering DC.

Edit: I am assuming this is a low voltage capacitor. I do not know what the "french inverter circuit" is. If it has mains across it, DONT use a ceramic capacitor.

c4757p:

--- Quote from: Nickk2057 on March 31, 2013, 04:30:02 am ---the french inverter circuit

--- End quote ---

Sounds frightening. Not entirely because it's French. Careful with that capacitor.

Can you post the rest of the schematic?

Nickk2057:
sure thing.. but its a snipit of a video cause i have not found an accrate diagram o the net about it... hope t is th oes to se about... and please.. its for 110v and not 220v...

as you see there are two NPN transistors and two NPN mosfets there

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