STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[gyulasun]

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As for the ground, my understanding is that it is a common ground for all four channels.
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Well,  if the grounds are common, I would like to understand your measuring setup shown last week in your Reply #3105 here:
http://www.overunity.com/index.php?topic=8411.msg241850#msg241850

namely the position of the probe for the CH1 which is shown in parallel with resistor R1 as if  CH1 were a ground-independent input. 
If I suppose the ground clip for CH2 was connected to the generator GND in the bottom line to show correctly the input pulse, then the GND clip for CH1 could not be placed to any one side of R1 in the upper line as shown? because the ground clips would have placed a short across the generator either directly or via R1, I suppose.  Understand my problem?
So I wonder how the CH1 probe was connected in parallel with R1, once the scope has no individually ground independent inputs and both ends of R1 are at "hot" connection points, not at gnd level.

Thanks, Gyula

[Omnibus]

The whole idea was, in lack of differential probes, to make the passive probes share the same ground with the generator ground. So, the grounds of CH1 and CH2 meet at the same place where the generator ground is -- to the left of R1. To achieve this in a more direct way and to have a large area in an attempt to fight inductance I changed the setup with what I've shown in my last schematic. The idea is the same but probes and their little ground leads are avoided by clearly designating a common ground. Another thing I changed were the RadioShack ceramic resistors which, turned out, are wound and therefore a possible source of parasitic inductance and replaced them with metal-oxide resistors.

[LarryC]

The whole idea was, in lack of differential probes, to make the passive probes share the same ground with the generator ground. So, the grounds of CH1 and CH2 meet at the same place where the generator ground is -- to the left of R1. To achieve this in a more direct way and to have a large area in an attempt to fight inductance I changed the setup with what I've shown in my last schematic. The idea is the same but probes and their little ground leads are avoided by clearly designating a common ground. Another thing I changed were the RadioShack ceramic resistors which, turned out, are wound and therefore a possible source of parasitic inductance and replaced them with metal-oxide resistors.

From checking online for RadioShack metal-oxide resistors, they don't seem to be a good choice. Very little inductance but the low wattage will cause them to heat up and distort the measurement and the higher ohm rating will pull more power from the circuit. Please check  http://www.rc-electronics-usa.com/buy-current-shunt.html for the appropriate type for a high end scope. Picture below.

Regards, Larry

[Omnibus]

@LarryC,

Thanks a lot for the link. I will order some of these and will report the outcome. I have already ordered 1Ohm (0.05% tolerance) shunt resistors and am waiting for them to be delivered. At present I'm using 10Ohm, 1W resistors from RadioShack: http://www.radioshack.com/search/index.jsp?kwCatId=&kw=metal-oxide%20resistors&origkw=metal-oxide%20resistors&sr=1. These should be fine for the conditions of the study. I don't think that using shunts having several Ohms resistance should be of any concern in this specific study because the goal here is not the minimizing of the heat losses. On the contrary, heat losses here are the output, as the correct energy balance requires. As seen, if the energy balance is done correctly overunity is trivially present in transformer-type devices. The last schematic I'm using further optimizes the effect and now, as I mentioned earlier, what remains is to design an appropriate converter. It would allow to have the excess energy of the output to be converted into I and V of a proper form which can be fed back into the input and thus turn the transformer into a self-sustaining device.

[Omnibus]

As a matter of fact now that the schematic has been optimized with regard to inductance it appears that the greatest effect is observed with a symmetric sine wave which simplifies the needed design of a converter aimed at preparing the I and V of the output signal to be fed back into the input.