Originally posted by NickZ
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@NickZ
About the can just 'voltage potential only'....
Yes and no

Yes it *can* light up 1 to 100000 LEDs, depending on how high the voltage potential is.
But NO, it can't do that *if* there is not at least enough micro amps to overcome circuit resistances... the legs of the led -although minim- do have an resistance, placing say 10 LEDs in a breadboard an have some bridges and contact wires, will possibly mean some 0.05 Ohm or so resistance... If an applied potential has not enough 'amps' to overcome these resistances, it won't work.
Tesla, found a nice solution to this problem, as -I guess- he did understand something about 'volts' and 'amps' that -seems to be- lost in time... Maybe he thought *why* use a tank circuit only in a ONE way direction... *why* not use it on both sides (e.g. as an transmitter AND receiver at the same time and using a single channel).... As the potential is free to grab everywhere around us.
Also, maybe he wanted to reach a higher frequency, and thus came up with a pancake coil to experiment with it.
Edit: Nick, using a modified replica of the super penny, I am able to blink a white led on (out of my head) 0.46Volt at 3.5uA (under load). At about 1 volt and 10 to 50uA, I can get the LED in continue mode (from very dim to clearly but not bright visible). At some 1 volt and 1mA, the LED becomes just to bright to look into its center from a foot distance. At some 1.5volt @1.8mA, I can faintly see the beam 'dot' on the ceiling. My own MEGA penny (made long before the existence of penny (An over 20H coil), and more a sub replica of GotoLuc's 'self running coil' project, could go to extreme low voltages... I managed to get it going at below 0.16 volt and about a couple of uA's (under load). Of course, all this with use of the oscillator circuit, because the cell voltage can't reach above 1.5 volt.
--
Ron.


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