VIC-PICK UP SECTION

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no problem, it looks like, if im reading the data sheet correct, that pin 14 has a built in inverter which will convert the High signal to Low. The ONLY time the indicator circuit will output the square wave signal is when its in resonance 

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I thought it was only the input of the phase comparator. But is clear if the phase remain aways high the filter capacitor will be dicharged and thus the freqency will change going down so not necessarily it will search for the resonance ..



Stan was very genius...

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 The igbt solved pretty much all the problems, it runs solid with nothing connected to it seem that it already have the protection.. look the pic... I worked till the fuse blew. I was puting like 175 volts...


I found that it can limit the current if i reduce the voltage in the gate. AMp restriction... hehe
 


Now i'm going to add more turns on the primary.. .and try adding a diode in parallel with the primary..

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here is a simulation scope shot of the output of the "Pulse Indicator Circuit" when its in resonance and when its out of resonance. The image on the left is the resonance signal from the feedback coil. The top line is the output signal of the OpAmp and the bottom signal is the resonant signal. The image on the right is the non-resonant signal, top line is the output of the OpAmp and the bottom is just basic square waves from the feedback coil. Basically resonance is detected when the input signal to the OpAmp is BIPOLAR and when the signal is UNIPOLAR it is considered out of resonance. Very simple huh?
(http://www.globalkast.com/images/tonywoodside/Pulse_Indecator_Circuit_Resonance_Detected.PNG)

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I understood, thanks for that. I'm chilling a bit later i'm going to make more experiments. i'm going to add another coil in series in the same core, to try reducing the resonant frequency further.. i'm also going to wind more coils in the primary to have more impedance so my voltage to amp ratio is greater as load for the variac..


could you provide the circuit schematic with the resistor values..?




what is this program? simulator?

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I use MultiSim 11 Pro Edition for my simulations, its a really good program. Heres the  schematic with values for the Pulse Indicator circuit.
(http://www.globalkast.com/images/stanmeyer/Fig.9.PNG)

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@Tony:
Just for informational purposes: The resistor values of the LED part are not like the ones Stan used in the original. Just to mention. Sure it's not important, as it's for just driving the LED anyway...
The capacitor,as you placed it, wouldn't IMHO make too much sense, and is not the way Stan put it. And the symbol of the capacitor shouldn't be a normal electrolyte cap, but a bipolar one.
Sure, these are just details, but I like to be quite straight in these things...I know, I'm a little picky...

Edit:
BTW: Why did you remove the VDD connection in the schematic? You need to tie the circuit to a voltage which lies in the OpAmp input range. Otherwise the circuit will not work all the time. You don't need to make 2 coils and tie them in the middle, as in Stans patent circuit. It is enough, when you just tie one side. I would tie the neg side to 5V. Like that you can make sure, that the inputs to the OpAmp are always in a valid range. I think Stan did the same, for in the 5-coil-pic you can clearly see one 5V wire going to the windings.

Edit2:
Hmm, it seems like the server was having some real difficulties. E.g. the few posts after this one (especially the one by Don) were deleted.
Don stated the real values for the LED-circuit, as can be seen from the original VIC-PCB-picture. And as it seems, Tony now corrected these resistor values.

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In the patent "WO1992007861A1 CONTROL AND DRIVER CIRCUITS FOR A HYDROGEN GAS FUEL PRODUCING CELL"
TX3 has also a center tap, connected to Vdd Positive supply voltage.

br,
Webmug