Electronics > Beginners

Replacing a 50uf cap for a 47uf

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gkmaia:
Looking at the schematic attached is it ok to replace the caps 87 and 86 for a 47uf. Reason being quite hard to find 50uf at acceptable prices here.

bd139:
47uF is fine. The tolerance of them is so wide (usually +/-20%) that it's not much of a concern. I would make sure there's good headroom on the voltage though (160v+)

lordvader88:
Yeah those are just big storage tanks basically, to provide some current when the AC drops. The bigger the better in fact, provided u could afford them. 47u vs 50u won't matter any real amount. But as a rule it's better to go bigger, than smaller for tank cap's

Zero999:
The values for electronic components have been standardised on the E series of preferred numbers, a good  50+ years ago, so values such as 50µF are no longer common. Electrolytic capacitors are typically made in E6 values, with E3 i.e. 10, 22 and 47 being most common. As mentioned above, the tolerance is so wide, it doesn't matter. Indeed the manufactures won't have changed their processes to make 47µF, rather than 50µF, they would only change the label.
https://en.wikipedia.org/wiki/E_series_of_preferred_numbers

Older schematics will have odd values, before they were standardised, but it's easy to replace them with the nearest E6 value, so 50µF becomes 47µF, 300µF -> 330µF, 800µF -> 1000µF etc.

soldar:
Not to mention that capacitors used in filtering rectified power supplies are not of critical value and you could replace it with a slightly higher value with no problem.

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