Please help ID this capacitor

[tommi]

Can you help me ID a small capacitor. The photo shows two identical
capacitors which are marked with:

225F *

Underneath that marking on the capacitor is a + sign followed by a
long line.

http://i39.tinypic.com/2kn8u0.jpg showing AA battery holder.

-----------

(1) Are they likely to be tantalum capacitors?

(2) Does that marking mean they are 220nF or are they 220pF? Or some
other value?

 

[att]

"tommi" <billgates@microsoft.com> wrote in message
news:Xns9BC099D604713451E7A@204.153.245.22...

Can you help me ID a small capacitor. The photo shows two identical
capacitors which are marked with:

225F *

Underneath that marking on the capacitor is a + sign followed by a
long line.

http://i39.tinypic.com/2kn8u0.jpg showing AA battery holder.

-----------

(1) Are they likely to be tantalum capacitors?

(2) Does that marking mean they are 220nF or are they 220pF? Or some
other value?

2.2uf, voltage unknown. They sure look like tantalums.

 

[alchazz]

On Sat, 28 Feb 2009 18:35:28 +0000, tommi wrote:

On Sat 28Feb 15:08, att <n2nbe@att.net> wrote
"tommi" <billgates@microsoft.com> wrote:


Can you help me ID a small capacitor. The photo shows two identical
capacitors which are marked with: 225F * Underneath that marking is
a + sign followed by a long line.

http://i39.tinypic.com/2kn8u0.jpg showing AA battery holder.

(1) Are they likely to be tantalum capacitors?

(2) Does that marking mean they are 220nF or are they 220pF? Or some
other value?


2.2uf, voltage unknown. They sure look like tantalums.


I've heard tantalum capacitors can get noisy or break down over time.

The device in my photo is used to power a microphone. So any noise from
it would be very unwelcome.

Is it worth changing those capacitors to another type? Would something
like a polyester capacitor have enough capacity for 2.2uF and still be
physically small enough to fit in the space on the circuit board shown
in my photo?

http://i39.tinypic.com/2kn8u0.jpg

There could be other sources of noise. For example: no shielding in the
plastic case. And are those carbon composition resistors? They can be
noisy. I don't see any ceramic capacitors; those can be noisy due to
piezoelectric effect.



Al