Help with cap values

MKplayer1start

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Hey guys I forget what the rule is. Is it okay to go up in V but never lower? Let's say I have a cap 25v 2200uf can I replace it with a cap 35v 2200uf?

and do the uf values always have to match?
 
You can use a different capacitor value in some circumstances, depending on how it's being used. Capacitors used in bulk bypass instances, like on the output of a bridge rectifier or across the output of an audio amp, oftentimes you can use the same decade value. For instance replacing a 3300uF with a 4700uf in those cases is probably ok. Although don't try to replace a 4700uF with a 470uF!
 
The voltage is rated voltage at which the capacitor breaks down. As mentioned, you can go as high as you can physically fit.

The capacitance (uF) defines how it functions in circuit. Again, as previously mentioned the application determines how much of a difference is acceptable.
 
Good information here. If I could piggyback a question on this thread - how much of a difference does tolerance make? I have a WPC pinball power board in need of recapping and there's a cap labeled C2 that's listed as 100uf, 25v (-10,+50). I can only find similar caps with a tolerance of (-20,+20).

The cap is badly bulged and needs replacing, but I'm not sure if the 20/20 caps will do the trick. Will they work?
 
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