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Multisim sim

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sebosfato:
There are few ways to accomplish this...

one is the PLL, it takes its signal from a voltage controled oscillator VCO the voltage that controls it goes to pin 9 its from 1v to vcc-1... the frequency is determined by the capacitor and resistor relation, it also allow you to have an offset of the fequency such that the band where it can lock can be varied... i think this is R2 going into pin 12... pin 11 goes R1 and pins 6 and 7 goes the capacitor...  the resistors or pots terminate in ground 0v.. the frequency is independent therefore meaning it oscillates disregard of its in resonance or not.. the frequency going out also gets into the pll phase comparator... the phase comparator works on edge detection. you also need a feedback from where you take the signal to compare with on the other input of the phase comparator... the output of the phase comparator is filtered and feedback into the pin 9 VCO... the phase comparator will charge up or discharge the filter capacitor accordingly with phases diferences creating a phase locked loop... the loop may have delay on the feedback side that may need to be compensated for geting proper absolute perfect resonance..

is important that you understand the phase relations of the pulse you are applying and how you get the feedback... the feedback signal must come from what you are trying to resonate.. depending on the coupling method etc...

Newguy:
https://www.google.ch/patents/US3586791

Figure 3

He gives component values using the human head as capacitance.
Can you explain how that circuit auto tunes?

sebosfato:
he is not interested in the capacitance of body actualy he just couple capacitively to have a fixed freq to work with, such as the load variation wont affect the carrier... he even uses a feedback to make the carrier auto tuned... 

Newguy:
Tripple Slope Generator is my TSG circuit to clarify that part...in his hearing patent Puharich states the need to auto tune due to the different capacities of the human head ...he states the use of high inductance coils and how the resonate frequency changes when using different types of electrodes...the other circuit, i think figure 2 was a variable type generator for use with all his different type of electrodes is that right? Wich one does he use as the input to component 2 of his wfc?

sebosfato:
If you put a capacitor that is 10 times biger than the other in series basically you end up with smaller capacitance than the smaller capacitor... if you get the signal to oscillate only with the head capacitance you will get a changing frequency... if you get a capacitive coupled drive in this way you get a stable resonance that will fluctuate not much than 10 percent... for example..

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