Wireless power transmission using Joule Thief

[Positron360]

I do not know if this is a common and well-known occurrence in Joule Thief circuits, but recently I have found that by holding the negative terminal of a white LED in my hand while touching the collector (positive) side of the transistor (I am using a 2N2222A), the LED lights up, although it is very faint. It does not work if I do not physically touch the negative terminal, but it does not matter if I touch both the positive and negative terminal of the LED simultaneously with the same finger (I guess the resistance is too high to make any difference). After some trials, I saw that it also works if I connect one side of a single-wound toroidal coil to the negative side of the LED, leaving the other side of the coil not connected to anything. This effect is stopped if I disconnect the lead going from the bifilar JT coil to the base of the transistor, leaving only the input voltage to appear between the collector and base of the transistor.

It appears as if this is essentially an open-circuit wireless energy transmission resembling the effect obtained from Tesla coils. I tried connecting two LED’s and there was no change in the brightness, both lit up to the same level as with one LED.
I will give more details if desired, but I first wanted to see if there was any interest and if this is not perhaps a well-known phenomenon.

Thank you.

[Pirate88179]

Have you tried an Avromenko plug?  You can just add two diodes in opposite directions to the led and then hold one side with your fingers and the led will light up fairly brightly.  I made my first one and tried it on the Jeanna's Light JT circuit and the led lights up very well when held near the toroid.  You can also hear the JT's frequency by tuning an am radio that is sitting near the JT circuit.  (I made a video on this a while back)

I am glad you are posting about this.

Bill

[poynt99]

You may explore the similar effect of connecting the LED(s) directly at the standard JT output, but use a large resistor value (10k and higher for eg.) in series. The LED should still illuminate. This has been noted, explored, and explained to a degree at OUR.

.99

[Positron360]

Thank you, I will look into it. Update: It turns out that the connection to the negative terminal of the LED needs to be anything special, any ground seems to work fine. If I connect the negative terminal to enough metal, there is a point where there is no difference between me holding the terminal or connecting it to the ground.

[Positron360]

Sorry, I am new here: what does OUR stand for? Thank you for your input.