3v OU Flashlight

[EMJunkie]

...

~A

Beautiful Work Avalon!

All the Best

  Chris

[FixedSys]

If understand correctly; these circuits comprise only two signal generators, one coil and one load. They are tuned using the signals.

Can I then expect a similar degree of success developing and experimenting with software that:

frequency = lower limit of soundcard (20Hz)
While frequency is lower than upper limit of soundcard (20KHz)
Generate a fixed duration burst of signals (two harmonically related sine waves?) out of the two soundcard channels (low or high Z?) into a coil/circuit, back out into a soundcard input (low or high Z?).
When the input signal falls below a fixed threshold; record the timestamp and frequency, increment the signal frequency by a factor (double?)
Loop

The frequency that created the longest interval between timestamps would then be the most interesting. 

I'm thinking that the soundcard is the signal generator and the load, so what else would the circuit need besides a coil? Would the input or output impedance match the soundcard range at all?
I'm probably oversimplifying this, but how?

[Vortex1]

It would.
...and if you had a short HF low current winding there, its inductance would reflect the instantaneous width of that gap. A very useful information. 
The MC34063 can extract this info as an easily integrateable pulse widths, when operating in constant current mode with constant load.

What is your idea how to utilize the kinetic energy gained by the core halves?

There are many ways to do this, but one way without complicating things too much would probably be to use the core halves themselves as generators by adding a bias, either extra current in one winding or PM.

Of course a completely separate coil / magnet would extract energy and also dampen the Q

[itsu]

My potcores arrived (4.7cm / Al 9500) so i went for the 5.4 / 2.7mH setup using a pot core.
I used another fet (BS170), but there was no noticeable difference with the MJE13009 transistor

Screenshot is taken at 3.3V @310mA

5.4mH is at W2, but i tried many variations like swapping W1/W2, swapping the leads on W2 and/or W1, varying the voltage
and off course the pot meter.

Never did the leds want to stay on longer after removing the supply voltage.

Next i will try to move the MOSFET/transistor like suggested by Vortex1 here:
http://www.overunity.com/14524/3v-ou-flashlight/msg401301/#msg401301

Regards Itsu

[lost_bro]

My potcores arrived (4.7cm / Al 9500) so i went for the 5.4 / 2.7mH setup using a pot core.
......
Regards Itsu

Good day Itsu

Have you tried to 'characterize' the 'ferro-resonance' frequency of this new POT core?

Do you have access to a spectrum analyzer?

I agree with Vortex1 (ION) that one could spend an eternity trying to guess the tuning for this animal without  some kind of starting point for reference.

I would love to know if anyone has used a spectrum analyzer, like the Rigol seen in the Akula videos to 'characterize'  their cores?

To carry out a thorough analysis of the problem one must consider *all* of the datum .... maybe we should consider to look at it from the frequency domain perspective.  Apparently Akula did....

take care, peace.
lost_bro