Re: Capacitor Selection

[Frank Mc Alinden <fmcalind@xxxxxxx>]

Hi Tim
Like James forgotten all my theory.....But i would suggest use =
low leakage and higher temp caps would be better to use i think than
droppi=
ng to the lower temp ones..As Keith D mentioned recently in a post
Electrol=
ytic caps tend to dry up (esp in a hot enviroment) and when they do you
get=
a lot of ac ripple on your power supplies and this causes a hum coming fro=
m the amp.......Drop Keith a line ..im sure he will put you right......

HTH
Frank
----- Original Message -----=20
From: Hawes,Timothy Edward (GEG)=20
To: ukha_d@xxxxxxx=20
Sent: Monday, August 04, 2003 8:27 PM
Subject: RE: [ukha_d] Capacitor Selection


James, Andy,

Thanks. I'm still a bit confused though as the "CV" was related
to leakag=
e current i.e. leakage current: 0.01CV or 4=B5A (whichever is greater).

Any thoughts ?

Tim H.
(wishing I'd paid more attention at school now too . . .)

-----Original Message-----
From: James Hoye

> I think I know the equation you're talking about: Q =3D CV.
> As far as I remember, Q is the charge is Columbs, C is the capacitance
=
in
> Farads and V is the voltage (in Volts) across the plates.
>
> Not sure if this helps at all in this instance.

Ooops... I was way out :$

Yes it was Q =3D CV.

Funny how you spend months doing things like AC theory and never actually
seem to use them once you've done the exam.

James H

+