3v OU Flashlight

[rakarskiy]

It makes sense to wind the coil only on very unusual "cores".
It would be interesting to use the Wiegand sensor as the core and secondary coil. For example, WG112:

https://belchip.by/sitedocs/wg.pdf

The sensor is necessary for more powerful devices. The principle of operation of static convectors on the use of their fields are shown in my post above. "Unusual" core is your term.

[Raycathode]

That looks like basic ferrox years ago they used cores in computer memory with hysteresis many cores today no longer have that property
one way is to use magnetic material that's easy to 'flip' its polarity and wind a coil-over it to do so, or add a neo similar-sized device and use a coil and instead of flipping just turn the pair on and off. 

Raymondo

[rakarskiy]

Yeah right!  (Armedbrain and ratarsky) Explain where the Extra energy is coming from! all I can see is losses with your set up, exp;lain your coil winding and how you encounter the effects of skin effect, Also with the flywheel energy will be lost with spin up and down inertia ect and friction ect, etcetera and then there is lens laws ect, you were saying about gutters and bodily fluids ect, well drink your poison of your own choice and be merry as you do.

Raymondo

The discharge voltage will depend on the formula for the EMF = B * W * L and the current formula I = EMF (L1) - U(C1) / R (L2)+ R(D1)+R (C1)

Use a core based on iron, calcined it in hydrogen. The smoother the hysteresis the better. The magnetic permeability of iron is very interesting.
In my version, the polarity change is asymmetric.

[Sergh]

The sensor is necessary for more powerful devices.

You did not understand anything.
Vigand sensor should be tried to use as a power unit. The output of the sensor (not the module) gives weak 2 volts 10 microseconds signal pulses. Microwatts. They should be tried to be used to power the device. In the sensor there is a small coil wound on a core made of a very specific alloy with amazing magnetic properties.

https://en.wikipedia.org/wiki/Wiegand_effect

https://en.wikipedia.org/wiki/Barkhausen_effect

Although my forecast is pessimistic .. maybe, maybe not. this idea  may somehow turn out to be FE, if  come up with some special design of the magnetic field exciter in the sensor. For example, use a magnetization with a permanent magnet in conjunction with a resonant coil, which creates additionally weak magnetic field pulses.

[rakarskiy]

Sergh, you have a receiver, but you lack a field. I just decided to get enough magnetic flux. According to this scheme, the battery was discharged about a day, on a conventional prefabricated ferrite.  I think a regular bolt with nut (annealed in fire) would be more effective than ferrite. What for? I'll leave it to you to sort it out.