Joule Thief 101

[MileHigh]

Self charging JT

https://www.youtube.com/watch?v=tx3bpSKRuF0


Brad

Are you sure about that?  The signal you show is 300 millivolts peak-to-peak.  That's lower than a diode threshold.  Have you traced a rectified version of the signal to the battery if that is indeed possible?  Is it possible that your supercapacitor is self-charging?

[tinman]

Are you sure about that?  The signal you show is 300 millivolts peak-to-peak.  That's lower than a diode threshold.  Have you traced a rectified version of the signal to the battery if that is indeed possible?  Is it possible that your supercapacitor is self-charging?

Well MH,im going to say im a bit !er yea ! on this one.
First up-and im not sure on this,or why-->the EM wave form from the radio station is all above the ) volt line-all DC,as can be seen on the scope shot below. I have dropped the 0v line by 2 divisions.
Second-i have ran it through 12+ cycles now,and it still keeps charging.
Third-i has placed a clip lead across the cap,and drained it completely. When the shorting lead is disconnected,the cap only recovers to around 12mV. But once i hook the circuit back up,it starts charging again,and will keep rising to about 220mV,and then the circuit starts to self oscillate again--and the cycle continue's.

The circuit is as below,and the scope placement that is showing the waveform on the scope.
Are AM radio waves a modulated DC wave,or are they a modulated AC wave? If the wave is DC modulated,and we have a change in amplitude(change in time),then we need no rectification,as it is already a DC wave form--an AC wave form with a DC offset?.
Other than that,im not sure. The only thing left to rectify the wave form is the transistor-some how?.


Brad

P.S
In regards to your question-have i traced a rectified version to the battery(cap in this case).
As you can see in the schematic,the scope is across the cap/coils series.
Oh,and the scope is inverted.

[Nink]

Maybe take the antenna off your electronics kit and throw the circuit in the microwave.   

[Lidmotor]

Brad:
  This is what I have been trying to do for years with zero success.  I don't have a strong enough AM station near me.  Congratulations on doing it.  Please make sure that you are not getting any energy from the scope ground lead  A ways back a bunch of us tried to replicate Dr. Stiffler's PSEC only to find out the power came from the scope ground he had hooked up.    To really convince people what you say is actually happening you will probably have to take the whole setup outside.  I hate to say that but I see it coming.  If you are getting that much energy into the system without a big/long antenna then you have stumbled onto something wonderful.  Frankly even if the energy is coming from somewhere else I would like to know about it anyway.

MH:

  I have been looking at that 'out of the box' circuit you presented and backed away from it.  Too much work and not enough fun factor for a hobby guy like me with poor test equipment.  I did try something a little different based on it though.  I built a simple flip flop circuit and drove two separate NPN transistors off that.  The NPNs pulsed two 1mH chokes with leds across them backwards to make the light.  I powered the flip flop with a 3v coin cell and the inductor circuit with AA.  I made an interesting experiment but was horribly inefficient.
  Here it is and what it looked like on the scope:   https://www.youtube.com/watch?v=_X_g52LsVnU
   

[Pirate88179]

Brad:
  This is what I have been trying to do for years with zero success.  I don't have a strong enough AM station near me.  Congratulations on doing it.  Please make sure that you are not getting any energy from the scope ground lead  A ways back a bunch of us tried to replicate Dr. Stiffler's PSEC only to find out the power came from the scope ground he had hooked up.    To really convince people what you say is actually happening you will probably have to take the whole setup outside.  I hate to say that but I see it coming.  If you are getting that much energy into the system without a big/long antenna then you have stumbled onto something wonderful.  Frankly even if the energy is coming from somewhere else I would like to know about it anyway.

MH:

  I have been looking at that 'out of the box' circuit you presented and backed away from it.  Too much work and not enough fun factor for a hobby guy like me with poor test equipment.  I did try something a little different based on it though.  I built a simple flip flop circuit and drove two separate NPN transistors off that.  The NPNs pulsed two 100 mH chokes with leds across them backwards to make the light.  I powered the flip flop with a 3v coin cell and the inductor circuit with AA.  I made an interesting experiment but was horribly inefficient.
  Here it is and what it looked like on the scope:   https://www.youtube.com/watch?v=_X_g52LsVnU

Rusty:

Yes, that was my concern.  Maybe there is a "better way" to do this but it is beyond anything I would know how to do.

Bill