circuit design till 100MHz

That will require a moderately large wire. You may be able to use the braid of a coax as the mains conductor. This is a good way to get very tight coupling.

i know the

That isn't really true for narrow band applications. Making the transformer resonate, can make it do a good job of coupling the power without it having a high inductance.

has some good information

Can u elaborate more on this please.

the table at the bottom goes upto 1 ghz. it doesnt matter if the coupling is poor as its easy to amplify the signal. there are suitable amplifiers and transformers to drive broadband down std telephone cables.

or do you need to receive it too ?

there are various sources of info on transmitting/receiving signals over power lines.

Colin =^.^=

Do you have a copy of LTSpice?

If not go to

and download a copy of "switchercad3".

You have to always have a DC path to ground from all parts of your circuit so you can't fully isolate the high voltage side.

Try making a couple of tuned circuits with 22pF capacitors and about

120nH inductors. Load one with 200 Ohms and drive the other with a 200 Ohm signal source.

Inserting a statement like

K1 L1 L2 0.25

you can set the coupling. With only a coupling of about 1/3 rd, you will find that the power gets transfered nearly perfectly over a band a few MHz wide around the 100MHz center.

A single turn of coax about 5 or 6 cm in diameter could be your transformer. You need to make sure that it is mounted very stiffly so it doesn't flex and hold it away from the nearest metal by more than its diameter.

I suggest you get a chunk of coax and a couple of trimmers and give it a try. A simple experiment would make it a lot clearer.

I do have the LTspice.

i appreciate if you can ellaborate more on the technique you are suggesting about the coax. You can email me if uyou do not mind making some sketches for explaining.you can email me at snipped-for-privacy@hotmail.com

About Randy's book, i find its more for RF designers.

thanks to all.

Others may be reading so I'll keep it here.

Equipment:

1 15 OZ can of Pilgrim Joes Clam Chowder 1 Stiff card or thin plywood 25cm coax 1 Spool of tape 1 Sharpy brand marker 1 Tool kit 1 Tape measure 2 3cm #14 wires with stripped ends 2 Trimmers

Procedure:

1 Place the can in the center of the card. 2 Use the marker to outline the can. 3 Remove the can 4 Find the center of the coax and afix it to the card along the line. 5 Form the two ends of the coax evenly along the line 6 Find a point 1cm past where the two ends meet on each end. 7 Strip the coax jacket from the ends to the points found at step 7

8 Push the braid from the ends of the coax towards the middle to loosen it

9 Cut the braid at 2 cm of length 10 Unwrap the braid so that it is on one side of the coax and twist the strands together. 11 Strip and solder the #14 wires to the braids on the ends. 12 Wrap the exposed conductors in tape 13 Twist the #14 wires together to form a twisted pair 15 Solder the #14 wires to one trimmer. 16 Twist the coax centers together and trim at 5cm. 17 Stip the coax centers to expose 0.5cm of conductor 18 Use tape to hold the coax centers together 19 Attach the coax centers to the second trimmer 21 Apply large amounts of tape to holed the assembly on the card while you experiment with it. 22 Connect the mains wire to the #14 23 Connect the applied signal to the centers.

Its a prime number of steps so it must be good.

i do have the LT spice. if you can further ellaborate this coax thing it would be better. Picture speaks a thousand words. any sketches would be better to understand. You can email me at krishmaniacAThotmail.com.

I find the randy's book more for the RF designers. thanks.