Anyone has experience on this HUMplug-e product ?
Web page
http://www.21best.com/21_best/electronic/security/video/filters/for_sale_.html
says:
" Simply plug your equipment through this, to cure it of Ground
Loops. Filters out unwanted voltage and current in the ground line
that cause ground loop hum while simultaneously maintaining a solid,
safe ground."
I have experience on many different way on solving ground loop
loop problems in audio/vidoe systems. Practically every other
types of products listed on that page are known to me in details
(I have used similar produicts, know what is inside such items,
even manufactured some quite simlar products). I have written
some material on ground loop solving to
http://www.epanorama.net/do***ents/groundloop/index.html
How this HUMplug-e product works makes me wonder.
Given the specifications (15A current) and a small
size it can't be an isolation transformer.
According the description it keeps the solid
ground connection it just can't be a "cheater" plugs
that just simply cuts ground connection (dangerous
peactice that is not recommended).
My quess that it does some magic on ground connection
so that it stops/reduces the current that can flow on
normal ground loop case, but still lets the ground
connection to be good enough for electrical safely.
I am just wondering how this is done in such what that it
works and meets the electrical code safey requirements.
Anyone has experience on how this is implemented ?
Some of my quesses would be those impklementation
possibilities:
- some common mode coil type construction over all wires
- two parallel diodes (on different directions) wired
between input and output ground connections
(stops current when voltage difference is low but
will pass hort circuitfualt currents at low voltage drop)
Anyone commenting my quesses how this device works ?
Anyone has experience on this ?
--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and do***ents at
http://www.epanorama.net/
