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Omnibus · May 17, 2010, 11:29:24 AM

@teslaalset,

I was thinking maybe it will not be a bad idea if you could get one of these RadioShack 273-1380 transformers and do the power balance at several frequencies to compare notes.

teslaalset · May 17, 2010, 02:24:03 PM

Quote from: Omnibus on May 17, 2010, 11:29:24 AM
@teslaalset,
I was thinking maybe it will not be a bad idea if you could get one of these RadioShack 273-1380 transformers and do the power balance at several frequencies to compare notes.

@omnibus,
I live in the Netherlands, so it's not easy to buy those here.
Order them from the US is not a good option.
Shipment takes a lot of time + customs costs.

What is the purpose of this experiment?
Calibration?
I have no access to a fancy pulse generator, I pulse my coils using my own circuitry (fet drivers + fets), driven by a microcontroller kit. Nothing comparable with what you have available, unfortunately.

For other waveforms I use my PC sound card plus a windows program that can be used as a poor man arbitrary waveform generator.
I have an audio amplifier using this sound card generator for higher current where needed (e.g. measuring B-H curves).

Omnibus · May 17, 2010, 03:01:28 PM

@teslaalset,

Sorry I didn't know you don't have an easy way to get that transformer. I thought it might be good to compare the methodology, a calibration of sorts.

teslaalset · May 17, 2010, 04:27:01 PM

Quote from: Omnibus on May 17, 2010, 03:01:28 PM
@teslaalset,

Sorry I didn't know you don't have an easy way to get that transformer. I thought it might be good to compare the methodology, a calibration of sorts.

No problem. I will help where I can.

Omnibus · May 18, 2010, 12:46:22 PM

@Omega_0 and @teslaalset,

I'd like to discuss a little more the error which I thought I had made when assessing the output energy in the output coil in my RadioShack 273-1380 experiment. The output coil which I was using as load when ostensible overunity results were obtained has 36 turns, its diameter is 4.6cm and the height (length) is 1.7cm. These data should give a very low value of the inductance, something on the order of microHenries and therefore shouldn't play a role if I treat the coil as only an active resistor. And, yet, when I use that coil (its Ohmic resistance is about 0.23Ohms) and calculate the output energy as I^2R I get overunity. If, however, I substitute the coil with a ceramic resistor of 0.23Ohms the overunity effect goes away. Any thoughts?