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Capacitor in PSU wrong?

Posted: Jun 27th, '17, 08:02
by SOM
Hey,

I am just sort all Parts from the Mouser Bom...
Probably a beginner question :) The Building Guide says in the Powersupply that i need 1 680uf 35v capacitor...
But in the BOM is a 680uf 25v capacitor.
Can i use it anyway or would it be better to get a 35v version?

thanks in advance!
Sascha

Re: Capacitor in PSU wrong?

Posted: Jun 27th, '17, 10:29
by tjh392
SOM wrote:Hey,

I am just sort all Parts from the Mouser Bom...
Probably a beginner question :) The Building Guide says in the Powersupply that i need 1 680uf 35v capacitor...
But in the BOM is a 680uf 25v capacitor.
Can i use it anyway or would it be better to get a 35v version?

thanks in advance!
Sascha
The power supply coming in to the board is 15v so 25v is fine. 35v gives you a bit more headroom for longevity.

Re: Capacitor in PSU wrong?

Posted: Jun 27th, '17, 20:56
by SOM
Thanks! That was my first thought... but i was not sure :)

one moore question maybe...
In the Noise Section is the Capacitor C31 (50V1uf) But in the BOM is only a 50V 10uf .. hmm..
or am i blind?
can i use the 50 V 10uf ? i dont guess...or?

Re: Capacitor in PSU wrong?

Posted: Jun 27th, '17, 21:49
by tjh392
You shouldn't have a problem using a higher rated capacitor. Ideally in this case I would try and get hold of the 1uf 50v capacitor though.

Rule of thumb for replacing capacitors:

Never lower the voltage (unless if the voltage on the cap is far higher than the power line like your post)

Only increase the capacitance but there can be a certain tolerance so 10uf should be fine but I'd go with 1uf as stated in the schematic.