Muller Dynamo

[gyulasun]

this is the circuit that i used in the vid

This means you feed induced AC to the Hall and the pnp transistor.  Possible the Hall is protected inside against reverse voltage (many types have a built-in series diode in their inner supply line).   And whenever the induced voltage has positive peaks the Hall is able to trigger the transistor which shorts then the coil.  You show in the video this can also work.  (A circuit design engineer would have a face like this:  )

Gyula   

[mariuscivic]

This means you feed induced AC to the Hall and the pnp transistor.  Possible the Hall is protected inside against reverse voltage (many types have a built-in series diode in their inner supply line).   And whenever the induced voltage has positive peaks the Hall is able to trigger the transistor which shorts then the coil.  You show in the video this can also work.  (A circuit design engineer would have a face like this:  )

Gyula   

Good point Gyula! Thanks!
I have attached a diode to protect the sensor and the transistor. I have also connected another transistor of the same type in paralel to the other one. This gave me another 2V more.
I have forget to show and to say that when i connect this ''shorting circuit'' the rotor slows down a bit; but still, the output is more than double with the shorting method

[konehead]

Hi Mariu
Its as Gyula explained, the coil on far upper left is a small aircore generator coil, also induced by rotor magnets....and this supplys the DC power to the gate and driver and halleffect, instead of the 9V battery, which is used jsut for start up.
Optimal voltage is 14 to 15V for the gate,driver, and hall, and maximum is 15V and higher than that, something will blow so it would be good idea to put a 14V voltage-regulator in circuit too, and also maybe as well a 14V zener since that small generator coil is going to make in voltage whatever the rpms are....I use jsut 9V battery for testing, and put in the generator coils when finally decide whatrpms is going to be, then wind coils for that.

you should really try high amperage, HV mosfets hooked up bidirectionally in you coils shorting cirucit - the votlage should rise at  unbeleivably fast rate, and unbeleiveably high voltage - if "starting out" at 20V, there should be 400V in cap after a minute or so and plan on X3 voltage near instantly when you get it to work right.
That transistor is snuffing out alot of the rings from their fairly high internal resistance I beleive.....plus I thing it has some sort of limiting diode in it too....all that said, that speed-up you got is really interesting - you might want to keep everything "as-is" and explore what is going on there - mabye you need the resistance of the transistors for the speed up I dont know.... dont abandon what you discover thorugh your tests with my advice as to what I do....

[mariuscivic]

Hi Konehead

I must thank you for the time spent on explaining your circuit. Tomorow i'll go hunting for some mosfets and other components and i'll try to build it. Can you tell me your results with this circuit?

[konehead]

Hi Mariu
you should get X3 the voltage in cap "instantly" and X20 over say a minute as compared to what the "base" voltagte is that the magnets induce into the coil withour coil shorting...it shouldnt make draw go up to motor spinning the generator rotor -  I;ve never had a
speed up" happen however thats why I really want to see what you can do using your own intuition and ideas...
the peak-timing you seem to have under control, but you should try differnt cap sizes to be filling up,
also the output of cap to load requires lots more swtihcing, as cap needs to be disconnected from the coils when the cap hits load....wish it was as easy as put a load on it, and it speeds up.
I made something for someone two summers ago using the coil-shorting circuit that was OU - however in that thing, I put AC caps in series one of the  FWBR's  AC legs - it was around 80uf size to cut the lenz that way and didnt have the two-stage output circuit in it...you might want to look into that too, its alot easier that the two-stage circuit or diode plug...there will specific size of uf that is best compromise in cutting lenz and still letting caps fill fast...