Question about Capacitors

[john2k]

Is a 22uF capacitor the same as a 0.22uF capacitor? reason I ask is that I am getting capacitors for my 12v regulator, and the datasheet for the regulator says I need 22uF on the output and 0.47uF on the input. But when buying the capacitors, i noticed some suppliers list as 0.22uF and some list as 22uF. Am i missing something?

 

[john2k]

sorry i think i've found the answer. it seems i do need a 22uF for the output because 22uF is higher than 0.22uF as 0.22uF will equal 220nF.

just a quick question though:

for the input of my regulator which the datasheet says i need 0.47uF for, what kind of capacitor would be best option? Metallised Polyester , Metallised Polypropylene, Tantalum Bead or Radial Electrolytic? for the output i've used a radial electrolytic 22uF one.

 

[MrEE]

I'd use a 0.47uF to 2.2uF electrolytic AND a 0.01 uF Ceramic caps in parallel. I assume you are building just one regulator circuit. The caps should be rated at twice the maximum voltage you intend to use. This combination of two caps gives you a better filtering over a wider frequency range. Also on the output I'd put a 0.01 to 0.1uF ceramic cap if you have the room.

 

[(*steve*)]

Is a 22uF capacitor the same as a 0.22uF capacitor? reason I ask is that I am getting capacitors for my 12v regulator, and the datasheet for the regulator says I need 22uF on the output and 0.47uF on the input. But when buying the capacitors, i noticed some suppliers list as 0.22uF and some list as 22uF. Am i missing something?

22uF is 100 times larger than 0.22 uF.

Go by what the datasheet says (22uF sounds low, it may be the minimum)