Menu

Don't do what I did.

Search this Thread

Prev

Previous Post

Next Post

Next

#4

Report Post

Old

June 15th 06, 04:32 PM posted to rec.radio.amateur.antenna

K7ITM

Posts: n/a

Default

Don't do what I did.

wrote:
Tom, do you live in the desert?!

You must keep those caps somewhere pretty clean... cool experiment
though... wonder what the record is for capacitor storage over a very
long time.

73,
Dan
N3OX

No; in fact, I live near Seattle! It might actually be worse in a hot
desert, though, because the leakage probably doubles every 10C or so.
Mine are stored with one lead soldered to a PC board, and the outher up
in the air, in a little cardbaord box. Of course, the gates in
isolated-gate PROMS hold their charge a very long time, too. But
modern automated manufacturing in well controlled processes produces
some very consistent materials. I told Bob Pease about my capacitor
'speriment (with two polyester = Mylar caps, and two polypropylene, all
0.1uF, all initially charged to about 12V, the limit of my
high-impedance volt meter) and he told me about being surprised that an
unplugged common printer power supply he had held its charge for many
days. I can tell you that the Mylars have a self discharge time
constant (about 5-10 years) about 1/10 that of the polyprops. The
"supercaps" aren't too bad either--those 1F 5.5V things. Seems to me I
measured a few months for those, though I don't remember for sure right
now.

Way off topic for antennas. Sorry, but some may find it interesting
anyway.

Cheers,
Tom

Reply With Quote

Reply With Quote

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
Smilies are On [IMG] code is On HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

All times are GMT +1. The time now is 05:28 AM.

About Us

"It's about Radio"

Contact Us RadioBanter forum home Privacy Statement

Copyright © 2017