Biasing the core can be done with PM also, like this guy shows it in yt:
http://www.youtube.com/watch?v=pGOFNrlVm1Q
I see 2 LC circuits.
maybe the thin winding is a original winding from this tv deflection core.

@EMdevices .Why can not the ferrite rod be biased by a permanent magnet???

1.soft ferrite rods are used extensively in high energy storage designs, inductive components, antennae and RFID applications. They can also be used in components where temperature stability or large DC bias is required

2. bringing permanent magnet of high strength near ferrite will damage only cheap Chinese ferrite  but  it is time dependent that means that exposure time = demagnetization time factor( there is no time equality but time dependability)
http://www.overunityresearch.com/index.php?topic=237.0
I partially agree with that  statements from the link.


3.Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic).


4.To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. "Hard" materials have high coercivity, whereas "soft" materials have low coercivity.
but
ferrite core demagnetization depends on size of grain(sand) metal oxide and bonding material thickness.

5.  A good permanent magnet can have a magnetization as large as a million amperes per meter...do not get confused  with that.. that is only analogy.

6.permanent magnet can lift up to 1000 times its own weight.

7.Ferrites: 800u permeability "J" type low-medium frequency ferrite rods of 0.62-inch diameter size. These are best for use in the frequency range between 10 KHz to 3 MHz


 2000u permeability "T" type very low frequency ferrite rods of 0.845 inch diameter size. These are new 2nd generation solid core rods and are best for use in the frequency range between 0 Hz to 500 KHz.
 2000u is a material that works at extremely low frequency, super low frequency, ultra low frequency, very low frequency, and low frequency.
http://www.stormwise.com/page26.htm
This link will give you  informations about ferrite (from HAMS)

http://docs.google.com/viewer?a=v&q=cache:nr0ZsrAbMnkJ:citeseerx.ist.psu.edu/viewdoc/download?doi%3D10.1.1.131.3545%26rep%3Drep1%26type%3Dpdf+Why+can+not+the+ferrite+rod+be+biased+by+a+permanent+magnet&hl=en&gl=us&pid=bl&srcid=ADGEESi38TyZjHKc1i3DBXf1PmC0fSwBB4VTSfrIsrtB1uOH8Z9C6p1_h4NLwTKU95xgqsXpcxjrqDcLHqY5Qw-m0rM2MVv6DyOLLh773SdH9hmNzr-oXhguIApIAgVXtIzGAxVFBvfD&sig=AHIEtbSdU6uJBqheMrGP3JmT8a1nvWfzww&pli=1

This link is abut antennas but explains bias.

8.Bias applied causes saturation it might be the way to control HV .
9. Saturation is always temporary stage till the material is permanently damaged
10. Saturation because of impedance change allow only little amount of  voltage to flow.

11. Quote from:
http://jap.aip.org/resource/1/japiau/v99/i8/p08M908_s1?isAuthorized=no

"Ferrite material properties may vary depending on the grade and manufacturer: there are differences between batches and also the production process may change in time. On the other hand, in power applications, the usual voltage wave forms are closer to square wave than to sine wave, and moreover they contain a dc bias component that can easily more than double the ferrite losses. Therefore, in loss critical applications it is good to be able to both test and model the losses of the actual ferrite cores under the same conditions as in the actual power application. In this paper, experiments were carried out at different induction levels and dc bias currents. Losses were measured at frequencies of 20, 100, and 500 kHz on a ferrite core with Ferroxcube 3F3 material, a Mn–Zn ferrite. We observe that mainly the lower frequencies are sensitive to dc bias. A model including wide ranges in amplitude, frequency, and also dc bias is proposed. In this model, the losses are separated in three terms: a hysteresis dependent term, an additional loss term depending on dc bias, and a high frequency term."



All said above stays of the mechanism and dependency of bias being applied to ferrite.

 







bias is for the purpose of canceling any residual magnetism in the ferrite.
bias is for the purpose of controlling gain in the certain number turns per square Ampere

I see 2 quotes:so I respond into it:

Magnet create temporary stage of alignment of dipoles within ferrite

If the capacitor is connected in parallel to winding  around the  ferrite core than this will induce electromotive force in the winding.
Notice on the video
http://www.youtube.com/watch?v=pGOFNrlVm1Q
He is moving magnet slightly inside the core.
If he was holding magnet in the core steady the energy induced would be consumed by LED.
After  removal of the magnet light is off.

when we dealing with magnet than we dealing with  polarization.
 depends on the angle  when introducing magnet  inside the core notice that gentleman kept it near one side of the ferrite core.

That experiment could be done with air core as well.
Q of  air =1
Q of ferrite can go up to 22 000 ( permeability dependent)

so ferrite here is only amplification device.
Apart from the facts mentioned above I do not see anything strange.


Wesley

Hi All,

In PVA9's youtube -

http://www.youtube.com/user/PVA9#p/a/u/0/lxCCGNfD2cg

can someone identify the long black/white component at 1:19 on the right side of the PCB. closest to his thumb.

Also, the device at the end on the black/white component, before the cap.

Kind Regards, Penno

ok I think I have got it ( if I'm totally not in error)

Signal from the antenna is delivered to be mixed with signal from generator utilizing Cristal oscillator.
That oscillator  reacts as heterodyne of AM receiver
Mixing of these two signals is being done in middle horizontally placed toroidal transformer... just as  the typical IF filter for  first IF

 Typically you in the AM receiver have tiny wire (transformer) and ferrite  screw road that is screwed  inside and that is what make bandpass of filter tuning it to desired  frequency of IF.
Than to goes to amplifier (transistor) than there is step up transformer vertical  toroid that works as voltage doubler.
at the end of this on the secondary you have light bulb  220V LED
but the voltage delivered is only 100V 1 A.( if it is 1A... that current is only assumption of the presenter of this video)

That is  what is clever.... is being able to rectifier part of AM strong  RF field

with the help of 4 diodes  filter it with  capacitor and utilize it to power microchip and transistor. in means of DC

The light does not fluctuate with the presence of AM signal as the speech or music is being played because the AM modulated signal contains of  two sight waves and the carrier. If  frequency of  carrier is being utilized than carrier represents steady RF  voltage when  side waves fluctuate .
 AM modulation is the modulation of amplitude of the carrier but in its spectral
form  you see  big carrier and two side waves from left and right.

Wesley

PS:
v shape wires might be inductive type of tunning.. where shape of that V  is altered to tune to carrier.
This device will work only in presence of nearby strong AM signal...

or if clever one .........tune it to frequency of power line 

 

Thank you, this is part 2 of schematics?

regards,
scratchrobot

This is not the part, but continue of schematics with revealed some parts unhidden

I ask because you said that you would release schematics in 3 parts.
But then i will puzzle along until June 21 2011 

Thanks for the update.

One point worth mentioning... if that's a minus sign above the capacitor! it should be on the lower plate shown connected to the negative side of the bridge. Most likely a drawing error but needs to be corrected and shown as + on future updates to observe correct polarity status.