Explain Tesla Pancake coils ?

[magnetman12003]

I have made the below Tesla pancake coil setup and it generates 48 volts with enough current yet to be determined. All from a 12 volt 1.2 amp hour battery.

Can someone please explain where the apparent extra power is coming from in simple terms to me? With 30 volts output and a transistor base resistance of 200 ohms I get hardly any current. At 48 volts with a transistor base resistance of
195 ohms I get that kind of output spark you see in the below video. Have I reached a point of resonance between the output coil and receiving coil laying on top?? My potentiometer allows me to adjust resistance and voltage.

https://www.youtube.com/watch?v=QhVOC19xFNM

https://www.youtube.com/watch?v=UNa2oHA94iE

[dR-Green]

It's the wrong type of coil for wireless transmission. The bifilar coil is filed by Tesla under the patent name "coil for electro magnets" or something to that effect. Two of those coils essentially make up the primary and a secondary of a transformer. The coil being powered becomes the primary, and the coil receiving "wireless energy" and powering the LED in the video you referenced and linked below is the secondary winding of the transformer.

Wireless Electricity II - YouTube

The 2nd wire in the bifilar coil serves as a trigger for the transistor and otherwise plays no role in its workings; an external signal source will do the same job.

For wireless transmission, Tesla used coils that he designed and filed under the appropriate patent name for the purpose. Those coils are not bifilar.

[magnetman12003]

It's the wrong type of coil for wireless transmission. The bifilar coil is filed by Tesla under the patent name "coil for electro magnets" or something to that effect. Two of those coils essentially make up the primary and a secondary of a transformer. The coil being powered becomes the primary, and the coil receiving "wireless energy" and powering the LED in the video you referenced and linked below is the secondary winding of the transformer.

Wireless Electricity II - YouTube

The 2nd wire in the bifilar coil serves as a trigger for the transistor and otherwise plays no role in its workings; an external signal source will do the same job.

For wireless transmission, Tesla used coils that he designed and filed under the appropriate patent name for the purpose. Those coils are not bifilar.

When a ""Transformer''' steps up voltage the current steps down.
So why the very hot output ""spark"" in my setup and 48 volts output using 12 volts to power the coil? Where did that current come from considering no wires between the primary and secondary coils???

[dR-Green]

When a ""Transformer''' steps up voltage the current steps down.
So why the very hot output ""spark"" in my setup and 48 volts output using 12 volts to power the coil? Where did that current come from considering no wires between the primary and secondary coils???

I don't know what the circuit is but you seem to be discharging capacitors. They will play a role in the amount of energy involved. It's not that the coil is necessarily outputting high current, but the capacitors are able to supply it instantly.