Test box build cap question

[chuckflorist]

Hello,

Wondering if someone can help, I bought a box cap for the Test Box build but I think I may have got the wrong thing. I got a JVF X2 metalized box cap but it's massive. It looks like this

http://aitcomponents.com/AIT%20Components/Pages/HTML%20Data/Capacitors/JFV%20X2%20Polypropylene%20Capacitors.htm

Should I be using this for a 9v application? It turns out I do have some 1uf multi layer ceramic caps, would these be a better fit?

Thanks for your help as usual chaps.

Cheers Chuck :)

[rocket88]

As long as it fits, that will work. The reason for it being so big is that the voltage rating is massive. The higher the voltage rating, the amount of voltage the cap will take, the larger it becomes. So I typically try to use the lowest voltage rating I can get away with in a build, cause the component will be smaller, and easier to fit in the enclosure. Obviously there are some exceptions, like the Panasonic esq caps, but it's a good rule of the to follow. With resistors it's the wattage, ie: 1/4watt, 1/2watt, etc.

So all of my electrolyics are either 25-50v as I don't have to worry about blowing them up, since all the effects I build are 9-18v. Usually Mylar/poly, multilayer ceramic, and regular ceramic caps will withstand more so I don't really worry about them.

Zach

[chuckflorist]

Thanks for your reply Zach. I'll shoe horn it into the enclosure and complete the build yay! :-)

Cheers Chuck

[motterpaul]

It seems to me the original box had a similarly huge 1uf cap also.