Lenzless resonant transformer

[forest]

Jack


I have a problem to visualize how you are finding the resonant frequency of secondaries , or  you did that for whole circuit after winding primary and attaching bulb to primary to see the effect of impedance ?

[penno64]

Hey Jack,

You need to take 5 minutes and watch -

http://www.youtube.com/watch?v=kQdcwDCBoNY

Regards, Penno

[Jack Noskills]

Jack


I have a problem to visualize how you are finding the resonant frequency of secondaries , or  you did that for whole circuit after winding primary and attaching bulb to primary to see the effect of impedance ?

There is a picture of it in the pdf. I think primary is not need to be wound when resonant frequency is looked using secondary coils. I put bulb for detecting current flow in the secondary before parallel LC circuit. When the light went from bright to dim and back to bright I got reasonably close. It does not have to be exact match.

[forest]

There is a picture of it in the pdf. I think primary is not need to be wound when resonant frequency is looked using secondary coils. I put bulb for detecting current flow in the secondary before parallel LC circuit. When the light went from bright to dim and back to bright I got reasonably close. It does not have to be exact match.

Ah, I see... so you test the same way as primary with parallel tank circuit and a bulb between audio amp and tank circuit. Good , I didn't noticed that in pdf.

[vince]

Hi Jack

I had some time today, so I put together a quick replication of your transformer. I took 2, 120 to 12 volt transformers and cut them apart then welded and bolted them to get a similar setup to your 2 output coil version in your paper.
The output coils have about 40 to 50 turns of heavier gauge wire and the input outer coil has 190 turns. I used the existing coils from the transformer which were factory wound to the laminated core and I unwound one of the input coils from one of the transformers  and rewound it onto the other two as per your drawing.

I do not have the proper capacitors yet so I tried it without them .
At first I tried a 12volt ac input and measured 1.9 volts on each of the output coils. when I wired the output coils together like your diagram I measured 3 volts.
The input wattmeter measured 35 watts to my power source transformer.
If you short out either of the output coils on the output seperately there is no change to input watts. However, when the two output coils are wired together as per your diagram and then shorted the input wattmeter jumps to 45watts.
I attempted to feed 120 volts in so that I could use my larger capacitors to test the circuit but the input coil gets way to hot.

Is this somewhat similar to your setup?
Can any body explain  why my primary gets so hot with 120 volts. It is the same length of wire used on the original transformer which did not get hot.
Thanks

Vince