Electronics > Projects, Designs, and Technical Stuff
Replacement Caps
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veedub565:
I need to recap an old PSU, can somebody recommend a brand/series of capaciter and best place to buy from. I found the values I needed on RS but, not cheap and some are just general purpose series. I've read that FM, FC, FR series are good ? Values are
100uF 50v
47uF 50v
470uF 35v
330uF 50v
1000uF 35v
4000uF 15v (sprague can neg)
An additional problem is that a lot of the newer capacitors for those values are a quite a bit smaller and the lead pitch is different so they don't fit the holes in the board. I'm guessing I can upsize capacitance/voltage rating a bit to get the right size.
VeryFastSnail:
I personally always buy more expensive caps. That ensurea that it’s quite a better quality caps, and about size, just bend the legs apart and solder it in holes... as precausion you can add heatsheink on exposed legs, but I never had a problem doing that...
I would not up the voltage rating of caps just to make them fit, because it’s waste of money.
andy3055:
--- Quote from: VeryFastSnail on December 18, 2019, 05:41:45 pm ---I personally always buy more expensive caps. That ensurea that it’s quite a better quality caps, and about size, just bend the legs apart and solder it in holes... as precausion you can add heatsheink on exposed legs, but I never had a problem doing that...
I would not up the voltage rating of caps just to make them fit, because it’s waste of money.
--- End quote ---
You must be a mind reader! Exactly the way I wanted to responded. ;D
Conrad Hoffman:
I'll always raise the voltage on caps less than 25 volts. The higher voltage will have lower esr and generally be more reliable. I go for the better series of caps by well known manufacturers even if they cost a bit more. You'll be ahead in the long run. Be careful bending leads on electrolytic caps. You should grab them with thin pliers and make two bends. What you don't want is to spread the leads in the rubber end cap as that can damage the seal and lead to early failure.
veedub565:
Thanks Guys, from an asthetic point of view I'd prefer to get capacitors with the right lead pitch if I can rather than bending leads. I know I know, nobody is going to see it.
I'm guessing pretty much any modern electrolytic capacitor is going to have much better performance than ones from 30yrs ago. I shopped around and found some reasonably priced Nichicon PS & PX series ones. Slightly higher voltage so they match the lead pitch of the original's, 105deg rated. There is a spec for the ripple current, but I have no idea what the original requirement was. I'm assuming that these new ones will have at least an equal or better spec than the 30yr old OEM ones. being a higher voltage rating I would imagine the ripple rating is also greater.
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