Hi all.

I need to make my own (simple) transformer.

I have a ferrite-ring core, i have 18 turns for the primary and 6 for the secondary.

When i apply my AC voltage to the primary it shorts out immediately.

I have tried putting a resistor as a load on the secondary, i have also tried putting a tiny bulb as a load on the secondary.

In both cases, when the power is applied it still shorts out.

What am i missing please ?


Gary.

Thanks very much z

I'm not using the mains i'm using the unrectified output from my replicatoin of Tom's device :

http://www.overunity.com/index.php?topic=9999.0

The resistance of the primary at the moment is only 2.9 ohms.

So i'll just wind some more turns, what would you recommend as a minimum resistance so i can calculate my coil length ?


Gary.

Thanks again z.

Doing it now


Gary.

I looked at your video from the 5W to 60W thread.  You built a transformer on a hollow tube.  You need to know about something called permeability.  This is the density of your core material (in this case a hollow tube).  I think you said a vegetable stock tin.  If its magnetic it works OK, but then you need to think about magnetic flux density.  Magnetic flux density is the concentration of flux lines around the coil.  Typically transformers are made as compact as possible to maximize the magnetic flux density.

It looks like you are applying direct current to your transformer and wondering why its not working properly.  Despite the idea that a "DC transformer" is a real thing I have never seen one that works.  Now there are applications where a DC pulse and a coil is used, like automotive ignitions, but that is a very different situation.  There we want a high voltage spark to ignite the gasoline, and don't care about the electrical aspects.  These Bedini motors, despite their popularity, are not the answer to free energy.

First you need to modulate the current on the primary side to make the current in the coil change.  The transformer effect only happens when the current is changing.  Sure you can do it with a switch, but that is not very efficient.  If you looks at the input and output waveforms of a switch actuated current in a transformer you will see these very narrow spikes of voltage.  Both the core and the secondary windings need time to change, and the transient voltages from the switching action are too fast for the core and the secondary winding to see the current.  The optimum waveform for an iron (steel) transformer is an AC sinewave below 500 Hertz, and Tesla calculated that the optimum frequency is 60 Hertz.  Now if you get, or build, a way to modulate your current then your transformer will start to behave like a transformer.  I have built several inverter circuits that could do this.

Then, about your magnet, I am going to assume that you are trying to modulate the transformer with the magnet spinning inside it.  This would account for the limited output that you have.  The powerful Neodymium magnet is modulating the magnetic flux field of the transformer, even though the input current is direct current, and causing the secondary coil voltage to fluctuate.  While the voltage number look impressive, the current low, thus your voltage falls off with a tiny load.

Get away from the Bedini poison, follow Tesla.  Tesla holds the magic key.  My recommendation would be to get, or build an inverter.  Rewind the transformer on a compact solid iron core.  Mount the magnet perpendicular to the end of the core, and as close as physically possible.  Then try the same experiment, and see if you get better current out of the secondary...

Thanks very much z, very well put

I'm sorry you wrote so much under a misapprehension though

That video is a magnet being spun by a switching coil connected to a bedini circuit.

The big coil you thought was the transformer is my output coil, the magnet inducing a current into it.

I'm putting 18 volts in and getting up to 200 out. I want to build the transformer to step down the voltage and get better current.

Hope this clarifies things

Hi z.

These are my wire specs (Standard Wire Gauge, UK style):

0.250mm (#33 SWG)

0.348 ohm/mtr

It doesn't arc, i would like to see that. I'm replicating a work-in-progress so it's kinda off-beat. I'm just in love with the concept, it's like a pulsed induction-generator with only one magnet and one phase.

My current must be ok though because i have shocked myself twice and it made me yelp both times !

I like the sound of your alternator. Will you be able to wind your new wire today also ?


Gary.

I like the sound of your alternator. Will you be able to wind your new wire today also ?

I get the wire today, then I have to take the alternator all the way apart, unwind the coil, rewind the coils, so maybe a couple days...

Mark, yeah I know, thought this through...

Funny the things you end up buying in this endeavour !

Today I needed wax paper, and double sided tape...