my discovery while playing with magnets

[mfred68]

this design uses both sides of both coils, could this work?

[gyulasun]

my main problem is that i dont have the correct tools to cut a toroid core!

is anyone willing to try this?

Hi Fred,

You do not neccessarily need to cut up toroid cores,  there are off the shelf U shaped ferrite (or laminated) cores like you can see here: http://www.magnet-tech.com/core/MnZn/mnzn_power_ferrite/UF_UI.htm  IF you have old computer monitor or old television receiver in the cellar, the line output transformer in them (which makes the high voltage for the CRT) has two U shaped cores for instance. 

Your last but one drawing seems good for me,  the only concern could be the polarities of the switched fluxes that enter into the toroid core and are expected to induce voltage/current in the coils may work against each other if one is not careful and this may decrease output.

Regarding your last drawing with the U shape core,  I do not like it as much because the electromagnet connecting the the endings of the U core may constitute a closed magnetic circuit with the output coil in the middle of the U core (such setup may work also as a conventional transformer, input and output flux path is common, this not really wanted in setups you expect ou from).

Have you noticed this video on the Hildebrand thread?  Very good test we can learn from it. See here: http://www.overunity.com/index.php/topic,2386.msg100361.html#msg100361

rgds,  Gyula