[ARC5] Tape

[don davis]

Yes, Kapton is the right stuff.  Teflon is awful.  Mylar film can be used OK
as well as polyolefin tubing.  Spaghetti tubing made of fiberglass is OK and
is period correct.  RTV might work - but ONLY electronic grade.  Leads can
also be epoxy coated to immobilize them.  Lead inductance shouldn't make a
difference with electrolytic caps at audio frequencies.

73 de don ad6PB



-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Brian Clarke
Sent: Wednesday, April 24, 2013 11:32 PM
To: Ken Gordon; Arc5 at mailman.qth.net
Subject: Re: [ARC5] Tape

Hello Ken,

It will depend on the kind of plastic. If it's PVC, eventually it will
dissolve in its own un-released solvents and the wire will cut straight
through. It it's Teflon, that is a little better, but it will deform if
there is any pressure on the side wall. If it's Kapton (poly-imide) it
should last well through the night.

The other problem you need to consider is the inductance of the leads - they
won't be equal. I assume the original capacitor had all leads coming out one
end. The leads to the upper capacitor will be longer and have a lower self
resonance then the shorter. You could equalise them by having all leads come
out in the middle of the stack to go the bottom terminals.

73 de Brian, VK2GCE.

On Thursday, April 25, 2013 4:04 PM, you said:


<snip>>
> I have to insulate the positive end of the upper cap from the negative 
> end of the lower one, but there is very little room.
>
> I cut several pieces of plastic electrical tape which is rated "up to 
> 600 V at 85 Deg C" and stuck them one over the other between the two 
> caps.
>
> Are these pieces of tape going to have enough insulation properties to 
> prevent an arc through them in this situation?
>
> Ken W7EKB

______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html