Author Topic: Multisim sim  (Read 4238 times)

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Multisim sim
« on: February 04, 2016, 23:05:00 pm »
Is anyone else working on this?

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Re: Multisim sim
« Reply #1 on: February 04, 2016, 23:38:51 pm »
i did worked a lot with it but was some time ago..

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Re: Multisim sim
« Reply #2 on: February 05, 2016, 02:52:25 am »
Im using my TSG circuit as an input...it seems to provide a fine tune of amplitude control but do you remember or can explain how his circuit automatically tunes to resonance? The simulation is hitting 500 megavolts .Puharich used military grade transistors ....do you know of suitable substitues?

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Re: Multisim sim
« Reply #3 on: February 05, 2016, 03:57:15 am »
You voltage only get that high if you are doing something unusual like having no resistance...
i dont rememer what is this tsg input...

i use today because of money limitation igbts of 1200v 15 amps... 1,2kv 30 amps i was used to use more than doubled the price in last years so i dont get them ... it costs here 10$ each...

the other comes out for like 5$


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Re: Multisim sim
« Reply #4 on: February 05, 2016, 04:42:35 am »
Aside from everything else...how about his circuit automatically keeping in resonance even as capacitance changes?

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Re: Multisim sim
« Reply #5 on: February 05, 2016, 16:12:58 pm »
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...

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Re: Multisim sim
« Reply #6 on: February 05, 2016, 18:28:05 pm »
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?

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Re: Multisim sim
« Reply #7 on: February 05, 2016, 19:04:30 pm »
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...