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Subject:Re: AFM Capacitor fix
From:Blake Thornton
Date:Mon, 21 Jan 2002 11:16:26 -0700

I guess this is something i forgot from my physics/electronics class.  So,
capacitance adds when put in parallel.

have I drawn it right:

http://sierra.westminstercollege.edu/test/diag.jpg

thanks,blake

On Mon, 21 Jan 2002, Larry Alofs wrote:

> I used the 10 MFD tantalums by connecting two in parallel. (Connect the
> 2 + leads together and the 2 - leads together).  If your putting it
> inside the AFM, I'm not sure about the amount of room.  I put mine in
> the connector that hooks onto the AFM by stripping the insulation back a
> little on the proper two wires and soldering.  The caps fit under the
> rubber boot OK.
>
> Higher voltage rating is good, if the package doesn't get too big
> physically; gives an extra safety margin and perhaps longer life.
> 16 V is OK since its a tantalum, but given a choice I'd go with 25 V.
>   Stick with tantalum; best in a hostile environment, low leakage.
>
> Larry A.
>
>
> Blake Thornton wrote:
> >
> > After looking at harald_nancy page:
> > http://www.geocities.com/harald_nancy/intermitt._syndrome.htm
> >
> > i went to Radio shack to buy a capacitor.  I was looking for a 16 volt, 22
> > micro farad tantalum capacitor.  Well, I couldn't find one.  Here is what
> > is in the radio shack catalog (pg 270 if you have one):
> >
> > Tantalum Capacitors:
> > 10 microF, 16 WVDC (I assume WVDC means volts) <--- is this the one?
> > 1  microF, 35 WVDC
> >
> > Hi-Q ceramic discs:
> > 4.7 pF  50 WVDC
> > 47 pF 50
> > 100 pF 50
> > 220 pF 50
> > 470 pF 50
> > .047 microF 50
> > .1 microF 50
> > .001 microF 500
> > .0047 microF 500
> > .01 microF 500
> > .01 microF 2000
> >
> > Metal film:
> > microF  WVDC
> > .01 50
> > .022 50
> > .047 50
> > .1 50
> > .22 50
> > .01 400
> > .1 250
> > 1 250
> >
> > Axial-Lead electrolytic
> > microF WVDC
> > 4.7 35
> > 10 35
> > 22 35  <----- is this the one, too many volts?
> > 47 35
> > 100 35
> > 100 35
> > 220 35
> > 470 35
> > 1000 35
> > 2200 35
> > 4700 35
> > 1000 50
> > 2000 50
> >
> > Radial-Lead electrolytic
> > microF WVDC
> > 220 16  <---- is this the one?  to many farads?
> > 470 16
> > 1000 16
> > 4.7 35
> > 22 35  <---- how about this one?
> > 47 35
> > 100 35
> > 220 35
> > 470 35
> > 1000 35
> > 100 50
> >
> > So, do I need to go somewhere else, or is the one I need here?
> >
> > blake
>