3v OU Flashlight

[T-1000]

Akula certainly is not experiencing ferroresonance but rather creating ultrasound by magnetostriction and this can happen at diffreren frequencies.Otherwise he would have killed his small transformer in a few seconds...somthing what happenes mainly in power-networks.

As I mentioned before, it was creating vibrations needed for piezoelectricity to work. And it was created by resonant approach while consuming microwatts of power. Then feeding back power in circuit from piezoelectricity is more than enough to loop circuit and light up few LEDs.


Cheers!

[forest]

May I ask what Q factor of resonant circuit means to you ? Can we have such situation that the input power to the radio transmitter is far less then the radiated power on antenna ? I think this is the key topic for very wide range of OU schematics

[T-1000]

May I ask what Q factor of resonant circuit means to you ? Can we have such situation that the input power to the radio transmitter is far less then the radiated power on antenna ? I think this is the key topic for very wide range of OU schematics

I am talking about high Q achieved in the coil. Also to keep low current draw the resonant circuit needs only fraction of power and feeding spikes instead of sinus/50-50% square  wave is more than enough. So feeding pulse train with like less than 5% duty cycle signals also helps with low current draw.



And did you ever tried to hammer ferrite with second spike on peak of BEMF pulse?

[Void]

Actually that second scope shot above from Akula's video where the waveform suddenly changes
into a big spike was due to a defect (bug) in Akula's Atten brand scope. That Atten scope has the
same internal hardware (Atten was just a rebranded scope with Siglent hardware inside) and I
was able to reproduce that exact waveform on my Siglent scope, and I demonstrated that the waveform
the scope showed was actually due to a glitch (bug) in the scope's hardware or software. The waveform shown
in the video was a false waveform due to the bug in the scope's hardware/software. There is a thread here
on this where I posted my own similar scope shots and demonstrated that it was due to a bug in the scope.

[Raycathode]

Who posted this 3volt flashlight? that doesn't work? I knocked this up on a breadboard most of the resister values are wrong
as the switch circuit wouldn't run the pot cor makes a nice squealing noise but doesn't give a sine or square wave out and the
one half of the 4069 doesn't do anything as the circuit isn't finished if a transistor is put between the smoothed output of the PWM
and the rest of the circuit and timed correctly it might be a different story, see the circuit.

To be honest I don't know why i bother on this tread as it is totally dysfunctional from what it was as many of the design guys have
gone.