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Home > Archive > Alternative Power sources > February 2007 > Coupling Circuit
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| hi, can anyone please suggest me a good coupling crcuit with or
without isolation for transfering 120khz carrier in power line....if
with isolation ,then using pulse transformer of 1:1
ratio.............please respond immediately..as am stuck with this
part in my project...
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| Bruce in Alaska 2007-02-11, 1:25 pm |
| In article <1171186195.262005.189430@p10g2000cwp.googlegroups.com>,
"hith" <hith86@gmail.com> wrote:
> hi, can anyone please suggest me a good coupling crcuit with or
> without isolation for transfering 120khz carrier in power line....if
> with isolation ,then using pulse transformer of 1:1
> ratio.............please respond immediately..as am stuck with this
> part in my project...
>
Most Carrier Current RF devices are Capacativly Coupled to the Powerline.
you need a couple of .1uF nonPolarized 1000V Caps. Thaat should do the
job.
Bruce in alaska ReTIRED RF Designer........ with an Emphisis on TIRED
--
add a <2> before @
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| On Feb 12, 12:22 am, Bruce in Alaska <bru...@btpost.net> wrote:
> In article <1171186195.262005.189...@p10g2000cwp.googlegroups.com>,
>
> "hith" <hit...@gmail.com> wrote:
>
> Most Carrier Current RF devices are Capacativly Coupled to the Powerline.
> you need a couple of .1uF nonPolarized 1000V Caps. Thaat should do the
> job.
>
> Bruce in alaska ReTIRED RF Designer........ with an Emphisis on TIRED
> --
> add a <2> before @
hi bruce,
i designed a test circuit using a function generator connected
to terminals A B(to produce 120khz signal),and then a pulse
transformer(1:1) for isolation,which in turn has a capacitor x2 rated
in series at other side of it and then connected to power line
(terminals C D)(230v,50hz)..at the other end of the room i tried
recieving the same signal using similar circuit...but the amplitude of
the signal was very low....the transmitter signal was 5v(peak to peak),
120khz...the recieved signal at other end of room was 120khz but of
the order milli volts..
A --------!!---------!------------------!---------! !------------------
C
cap-10uf(10v)! pulse ! (cap=0.1uf-X2)
!transformer !
! (1:1) !
B ---------------- !--------------------!----------------------------
D
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|
| On Feb 12, 8:17 am, "hith" <hit...@gmail.com> wrote:
> On Feb 12, 12:22 am, Bruce in Alaska <bru...@btpost.net> wrote:
>
>
>
>
>
>
>
>
>
> hi bruce,
> i designed a test circuit using a function generator connected
> to terminals A B(to produce 120khz signal),and then a pulse
> transformer(1:1) for isolation,which in turn has a capacitor x2 rated
> in series at other side of it and then connected to power line
> (terminals C D)(230v,50hz)..at the other end of the room i tried
> recieving the same signal using similar circuit...but the amplitude of
> the signal was very low....the transmitter signal was 5v(peak to peak),
> 120khz...the recieved signal at other end of room was 120khz but of
> the order milli volts..
>
> A --------!!---------!------------------!---------! !--------C
>
> cap-10uf(10v)! pulse ! (cap=0.1uf-X2)
> !transformer !
> ! (1:1) !
> B ---------------- !--------------------!--------------D
>
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|
| > > hi bruce,
>
That sounds about right.
You can't expect a 5V signal to appear on all the outlets in the house.
Everything that is plugged into the wiring in the house will dampen the
signal. Most electronic equipment has blocking caps on the AC input which
shorts higher frequencies.
You are just looking for a signal that can be separated, amplified, and
detected.
If you want a receiver that can reliably pick up a carrier current signal
throughout the house, then you need a receiver that can recover a signal in
the uV range.
Just think of it as a radio transmitter that is hooked to the wiring, the
wiring as a transmission line, with radio receivers hooked to the
transmission line in other parts of the house. The transmission line is
branched at random places, without proper impedance matching, and it is
shorted at other places. Carrier voltages at some places may be higher than
the output of the transmitter because of resonant points in the wiring ,
and it may be almost zero at other places.
But the signal will be present in all the wiring in the house, to some
degree. Even past areas that have been shorted by shunt capacitors. That is
because of the current mode transfer past the shorting point. You may have
to have a receiver that will operate in the uV range to receive it, but it's
there.
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