I made resonant transformer (BOCAF, transvereter) and get nice saturated core with high voltage from resonance (~400V, input 25V/200mA) in secondary coil. I tried to build circuit for drawing energy from resonated coil (shown on many web sites, with capacitors, transistors, SCR, ...) but they don't work. Resonance stop whenever I try to get even a mA from it.

Question: Does anybody built a circuit for drawing energy from resonated coil?

Thanks in advance,

Johny

PS Sorry if I missed some post with similar answer.

Cool cellphone charger. A picture of the circuit would be nice. Also how long it takes and how often this works and if the battery is killed by this circuit (similar to Hectors experiments) etc. etc.

Nice pdf Mags,


you can also look at RF transformers, there are some very exotic transformers made by Hams if you look on the net, they are designed not to interrupt the primary even if step up or down, I have a push pull design I use a lot between oscillator and preamp, also preamp to linear running at a kw, 28Mhz, the right ferite of coarse for the frequency is important.


regards


Mike

One way to get output from a resonant system is to tune the frequency to the load, ie. after placing the load on the secondary simply readjust the frequency till maximum output is realized for that load. I imagine the load is changing the L/C relationship of the coils and so changing the actual frequency of resonance for the setup when loaded a certain way. So as we need to do in many tuned circuits, we need to tune to get best output when loaded. All output will still come from the input unless energy is input from elsewhere. If the cores are becoming fuel via some mechanism then any extra input (if there is) may be explained that way. I very much doubt any extra energy can be obtained by "resonance" alone, however resonance can increase oscillating power as in the PDF here - http://www.panacea-bocaf.org/files/Trans-verter%20R%20and%20D.pdf
The oscillating power is not output until it is used to power a useful load ie. do some useful work. Measuring the current and voltage in a secondary tank and calling it is output is very misleading as it not output at all, it is simply oscillating power.  See attachment.

Mag's that PDF kind of alludes to the idea that if several toroids are used around the ring each one will output the same amount of energy as is input to the primary. Is that what it says ? Is the PDF hinting that if more than one secondary toroid is used it will go OU ? If so I can whip up a setup with one center core and several secondary cores and winding in short order and anyone serious about OU should be able to do the same, if they have core material and wire. My opinion is that the unchanging input from the primary will create a certain amount of flux and each of the additional toroids and secondary windings will share that, so that the output energy would never exceed the input energy even if the input is unaffected by the shorting of the output/secondaries.

Please confirm. Is the PDF suggesting a method of OU ? Or does it mean the additional secondaries will share the flux created by the primary ? 

Cheers

Mags,  Back problems can be a hazard of experimenting over a bench for too long, an existing back problem can become chronic if you continue to do stuff while it is trying to heal, please rest up a bit. Mine is similar but now chronic due to continuing to work using pain killers. Coming good very slowly now I am resigned to reduced work output, I wish i had rested just after I injured it but I was already taking heavy pain killers for a neck disc issue and did not feel when I blew out my lower back, now it is more of a problem than my neck, dang it. Almost impossible to get any treatment without breaking the bank. I've had to learn how to treat myself, it took 7 months to get an improving situation. Take care. 

As for the arrangement in the PDF, thanks for the reply and I will need to test that as well. I've got many kilo's of laminated induction motor steel, I can make as many toroids as I want.  Motor steel should be fine up to a few hundred Hz or even a few Khz, I like 400 Hz.

Cheers

Worked for me...

Dear Friends
Is there any type of capacitors that can handle high currents and heat in a secondary tuning? I currently use this type of caps with a voltage rating of 3KV. I put 6 of them in parallel to handle the current and to dissipate the heat as 1 by itself is being explode when resonance occurs. But, they are still running very hot!

Tnks Jeg

Nice pdf but I`m worried about one thing. When connect load to the "secondary" coil (wherever it may be in chain of coils), there is the electromagnetic force caused by the current in this coil. It affects the source - the resonant coil, and the resonance will drop down. Maybe is some "special case", in some combination of cores, where the influence to the resonance is avoided. I do hope we will find it.
Anyway thanks for PDF

Best regards

Sorry, didnt see this post till now.

Well, using 2 cores, primary wound to 1 core and secondary wound through 2 cores, loading the secondary increases the primary inductance, thus lowering the current in the primary compared to no load on the secondary. But, if you add a 3rd winding wound only on the 2nd core and load it also, then primary current will increase compared to idle( no loads), just like a normal transformer. But then add a 3rd core to the 3rd winding, and back to less current in the primary and idle current.

So if the primary is in resonance, loading the first secondary will increase the primary inductance and only lower primary resonant freq, not kill it. But if we load the 3rd winding, the one wound only on the 2nd core, primary resonance will be killed of like a normal transformer.

Mags