C2 and L1 change values radically between your two diagrams. Which are you actually using?

I was just getting to know both of the them better, but for now I will be using this last one posted.

 

Good day.

Well I am building a Wireless power transfer project for a final year project undergraduate degree.
Im using a 555 timer to generate the frequency and I would like to get at least 10V at the output of the coil L3 (thats for charging purposes)

I'm having the required resonant frequency and a proper sine wave but the voltage is to low (7mV to be specific).
I would like to know, how can I raise it.

Here is the circuit diagram, I'm using NI Multisim version 13.
And please find attached the file for the simulation (frequency, oscillation and the output voltage)
Thank you
View attachment 188064

Thank you

Note the 2n3055 is an old TO-3 power transistor and 2n2222 is a low power switching transistor. the power transistor leakage current may be shorting the 2n2222 base. Besides, the pair is a current limit circuit, the 2n2222 base being shorted to ground if >.7V on R6 (at ~0.1 milliamp).

 

New circuit is a free running multivibrator in saturation mode so yes unless you put a ton of filters will be a square wave. The .4 uf is too large and I question the need for a parallel capacitor on the output coil. If you are hoping for a sine wave ala resonant power supply then the "Q" of the circuit is way too low. Amateur radio uses class C (pulsed) RF amps and clean up the waveform using "pi sections" which also matches the power amp to the output impedance. Perhaps a book on antennas to help with your power transmission issues?