Hi, I'm working on fixing a circuit right now and I need a quick answer if possible: can I replace a 2.2mf capacitor with a 10mf capacitor?
Voltage is not a problem here.

 

Hi, I'm working on fixing a circuit right now and I need a quick answer if possible: can I replace a 2.2mf capacitor with a 10mf capacitor?
Voltage is not a problem here.

First off, are you talking millifarads (which have the unit mF)? There was a time which mF was often used for microfarads, because µ was hard to typeset and because millifarad was a quite large capacitance. So if you are pulling the numbers of something old, it might mean either.

As to the question itself, no quick answer is possible. It depends entirely on what the purpose of the capacitor in the circuit is for. For many cases, using a 5x larger capacitor is just fine, but in other cases it would be better to use a smaller capacitor than a larger one. In other cases (such as if the capacitor is part of a timing circuit), you need to stay close to the original value. The parasitics of the two are going to be different and in many applications this won't matter at all, but in others it might cause all kinds of problems. Other parameters, such as ESR and leakage current, might be important (or might not).

 

As @WBahn says in order to help you it is essential that you describe the type of application that the capacitor is used in. I’m guessing your units are uF rather than mF.

 

So, I have rgb modded a crt tv (old consumer tvs), but I still need to finish fixing it. I believe that capacitor is part of the vertical circuit. Here's the schematic, the position is C510, it says 2.2, 200v, it's an electrolytic capacitor:






Full service manual: https://www.electronica-pt.com/media/kunena/attachments/1553/KV34FS13B.pdf

 

Capacitor C510 looks like a critical component.
I would not replace it with 10μF.
In fact, I would replace it with 2.2μF 250V non-polar capacitor.

 

The fact that it is in series with an inductor implies that it is part of a frequency-selective network and the value is pretty important. You need to replace it with the same size cap.

 

Capacitor C510 looks like a critical component.
I would not replace it with 10μF.
In fact, I would replace it with 2.2μF 250V non-polar capacitor.

Are you sure it would work? I have way too many of them here. Mind showing me a picture of the one you're specifying, please?

The fact that it is in series with an inductor implies that it is part of a frequency-selective network and the value is pretty important. You need to replace it with the same size cap.

Thanks, that clarifies everything.

 

Are you sure it would work? I have way too many of them here. Mind showing me a picture of the one you're specifying, please?

There is no guarantee that it will fix whatever problem exists. All I know is that the designer selected 2.2μF for a particular reason.

 

I don't have a specific component to suggest.
What is the original package type, radial or axial?



Top is radial package. Bottom is axial package.

Here is an example of an axial package type capacitor.
https://www.newark.com/illinois-capacitor/225mpw250k/cap-film-pp-2-2uf-250v-axial/dp/84M4552

Datasheet
https://4donline.ihs.com/images/VipMasterIC/IC/CDUB/CDUB-S-A0013673942/CDUB-S-A0013673961-1.pdf

 

I can’t help it. The title of this thread bothers me every time I see it.

Substitute A FOR B

or

replace B WITH A.

Both mean take out B and put A in its place.

 

The service manual indicates a value of 2.2uF 250V 20% electrolytic and it is not a safety critical component.
Why aren’t you replacing it with the correct value, they are available from eBay and other hobbyist suppliers as well as the usual professional suppliers.

 

The schematic shows 2.2μF/200V polarized.
We assumed that it failed once.
Hence the next one I would select would be 2.2μF 250V non-polarized if you can find one.

 

I don't have a specific component to suggest.
What is the original package type, radial or axial?

View attachment 298459

Top is radial package. Bottom is axial package.

Here is an example of an axial package type capacitor.
https://www.newark.com/illinois-capacitor/225mpw250k/cap-film-pp-2-2uf-250v-axial/dp/84M4552

Datasheet
https://4donline.ihs.com/images/VipMasterIC/IC/CDUB/CDUB-S-A0013673942/CDUB-S-A0013673961-1.pdf

It's radial.

The service manual indicates a value of 2.2uF 250V 20% electrolytic and it is not a safety critical component.
Why aren’t you replacing it with the correct value, they are available from eBay and other hobbyist suppliers as well as the usual professional suppliers.

Weekend, no store opened, but I probably will end up buying one tomorrow anyway. It's just that I have a lot of spare parts here and the closest one that I found so far is a 10 uF capacitor.