Re: Panasonic polypropylene caps

• To: tesla-at-pupman-dot-com
• Subject: Re: Panasonic polypropylene caps
• From: Richard Hull <rhull-at-richmond.infi-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Tue, 23 Feb 1999 11:42:56 -0700
• Approved: twf-at-verinet-dot-com

In the post below the two dielectrics are compared at 1 khz.  Mention is
made of
the folks not specifying the polyester at anything higher.  This is because
the
stuff is crap much above that becoming like a big nichrome resistor in the RF
range.  Polyester has allowed the world to enjoy very large capacitances at
very
high voltages in relatively small packages for filtering purposes  below
500hz.
It should not be used for power purposes much above that.

Richard Hull, TCBOR

Tesla List wrote:

> Original Poster: Gary Lau  22-Feb-1999 0937 <lau-at-hdecad.ENET.dec-dot-com>
> The ECQ-E line has a polyester film dielectric.  These have a dissipation
> factor of 1.0% -at-1KHz, while the ECW line of polypropylene film dielectric
> caps have a dissipation factor of 0.1% -at-1KHz.  The ECW's also spec their
> dissipation factor -at-10KHz (0.2%) and mention high pulse currents, while
> the ECQ-E line makes no mention.
>
> Will they work?  Certainly not as well as the polypropylene units, but
> quite possibly better than glass/SW caps.  Seems cheap enough too.
> Anyone know what the dissipation factor is for glass?
>
> Gary Lau
> Waltham, MA USA

• Prev: Re: Tube coil capacitors
• Next: Re: T-minus 4 days and we're getting closer...
• Index(es):
  • Main
  • Thread