Quick question Caps and Regulators

Other Hardware General Electronics
1

Hi, many of you may know me and know that I done this question few times but it's urgent now
and it's a simple question.

I got a smd AMS1117 5.0V and KIA1117 3.3v smd as well now I got a urgent circuit to build and
when i build a regulator on a circuit I usually follow datasheet schematic but in the next days my
electronic local shop will not work, I got on my supply only:

10uF 25v
1uF 25v
100uF 25v
(all of them electrolytic capacitors)

can I use those to put on the input an output without causing any problem? if yes in which order?

ps. from my other topics on forum i got some suggestions that i can use 1uf at input and 100uF at output that will be fine?

2

I often use 10uF on input and 1uF on output.
Can add 0.1uF (100nF) on input also if there is high frequency noise on the incoming DC voltage.

3

I often use 10uF on input and 1uF on output.
Can add 0.1uF (100nF) on input also if there is high frequency noise on the incoming DC voltage.

I'm planing to use a 6v 4.5A Acid battery 10uF IN and 1uF OUT will be fine? probably gonna use a boostup
converter as well in between in case i need more voltage from the battery

4

6V may not be enough voltage for a 5V regulator.
10u/1u will be fine.
Take a look at Pololu.com, they have some regulators that will output 5v with inputs that start above 5V and drop to below 5V.

5

6V may not be enough voltage for a 5V regulator.

not sure if you saw but I said maybe gonna use a boost up converter to make the out put voltage of the battery above 7~8v, that's why I asked if that's gonna be ok for the regulators with that caps.

Exactly this one:

600×600 78 KB

6

10u/1u will be fine.

Well thanks for advice, gonna use them.

7

I think we're suggesting the same thing for the 5V regulator input.
'course if you have that, why not just have it output 5V and skip the 5V linear regulator? Keep the 10uF at the input to the board.
I power stuff all the time from 5V wallwart, and don't use a 5V regulator at all.

8

I power stuff all the time from 5V wallwart, and don't use a 5V regulator at all.

Well I create a PCB that has already the regulators on board 5v and 3.3v, so as input the user can use
from +6v~12v. If that would be my personal circuit then I would use it how i like but it's not for me :smiley: