Mmm-ok
 
 First results are in for the below setup.
 This was a quickly wound transformer-so not very neat,and only low power applied,by way of my SG. The loads are two identical !grain of wheat! incandescent bulbs.
 
 Unlike Wistiti's setup,i did not join the two output coil's,but rather placed a resistive load on each coil separately.
 
 EDIT-i forgot to mention--to achieve these results,i had to use a square wave,and a frequency of 12.2KHz.
 
 Still looking for the error,but here are the results so far-measured with both DMMs and scope using a CVR.
 The scope and DMMs had only a 2% difference with value's,so an average was taken from the both results.All DMMs were swapped around,and came within +/- 1%
 Tried using the clamp on meter,but currents are to small to register.
 
 P/in-6.8vRMS @ 19mA=129.2mW
 P/out 1-1.8vRMS @ 41mA=73.8mW
 P/out 2-1.83vRMS @ 42mA=76.8mW
 
 So seems to be running at 116% efficiency.
 
 We are close to being within error range with such small currents,but none the less,all care was taken when making the measurements.
 
 I will report back when i find the error-which seems to be oddly elusive ATM.
 
 
 Brad
 
 Sorry for the quick crappy diagram,but have lots to do ATM.
 Also added a pic of the toroid,and as you can see-very crappy winding job.
 

Well Chris-no cigar here-i found the error--> 2 incorrect value CVRs is all it took to throw the readings out.
At these small power values, .2 of an ohm can make a big difference.
So,my P/in CVR was .9 ohm's,and the P/out CVR was 1.1 ohms-well as best as my best DMM could make out. Both are banded as 1 ohm.


Brad

 P/in-6.8vRMS @ 19mA=129.2mW
 
 

 P/out 1-1.8vRMS @ 41mA=73.8mW
 
 

 P/out 2-1.83vRMS @ 42mA=76.8mW
 
 

Which is NOT the video we were originally were discussing Gyula!!!

   Chris Sykes
       hyiq.org

Chris, I finish with you, no sense to continue.  Please remove  your point 4 line as I kindly asked you previously, I do not participate in your campaign here, ok?.  I wanted to help with my comments but you are making war.

Gyula

As I wrote it is reply 7877.

Gyula

Within all the mud slinging there may be a ray of sunlight trying to shine thru!  Has anybody taken a close look at Itsu's video with the re-positioned current probe?  Only Itsu can answer this but if his sense resistors are accurate say within 5%, his measurements indicate OU with reasonable scope measurements.

I've attached a scope shot below of what I'm referring to.  Keep in mind that the current measurement is 10x so it is really 109.6ma rms and in phase with the input voltage of 1.431v rms. This equates to a Pin of 156.8mw rms.

The outputs are 136.6mw for CH1 and 42.77mw for Ch2 for a total Pout of 179.37mw for an overall COP = 1.145.  This efficiency is high enough to warrant more investigation IMO.

pm

Here are my results of testing a replication of Itsu's circuit using 50mm ferrite toroid wound with 18t and 36t counter-wound windings.  The resonance cap is a 1.98ufd Wima MKS film and the sense resistors are Caddock 1.00 ohm 1% non-inductive film type.

Great care was taken with calibration and measurements as follows-  A Fluke 515A calibrator was used to check the accuracy of the 1v and 10v AC ranges of an HP 3455A volt meter.  The 1v range displayed 1.0007v ac at 400 Hz and the 10v range was 10.0099 at 4kHz.

The voltages measured across the 1 ohm load resistors were then compared to the HP 3455A measurements.  The current probe was also checked by measuring the current thru each load resistor and comparing to the voltages measured by the scope.  The Math channel was used to calculate the input power and was compared to snapshots of CH1 and CH4 with cosine correction of the small phase shift.

The measurement comparisons are as follows-

Tek CH2 .5827v rms
HP 3455A .5889v rms
Current Probe .5723A rms

Tek CH3 .3048v rms
HP 3455A .3050v rms
Current Probe .3005A rms

The "Resonance Measurements" scope pix shows the waveforms of interest.  Math indicates the input power to be 461mW.  CH2 output voltage is 586.2mv which calculates to 343.6mw and CH3 is 305.2mv which equates to 93.1mw for a total output of 436.7mw for a COP = .947.

For an input power comparison, the snapshot for CH1 showed a level of 2.066v rms and the snapshot of CH4 indicated 223.2ma rms.  Therefore 2.066 x .2232 x cos(.189) = .4611w.

Overall the current probe seems to be low in measurement accuracy by 1.4% to 1.8% compared to the scope which would increase the power input and lower the COP if the measurements were corrected.  So, IMO, this device as presented is conservative.  Also this device is not equal to the Preva device in the fact that the bucking windings are connected in-phase with the dotted ends connected together.  As far as I can tell, this would also be similar to the devices tested by Tinman and gotoluc.

If anyone is interested in the scope pix showing data mentioned but not displayed let me know via a PM.

pm