Giantkiller moves forward into Full Heterodyning.

[buzz-ard]

@ sparks - Perhaps you've hit on why Tesla loved the pigeons so much...

[aleks]

@Sparks, @Mac CD,
I understand both of you. The steel with the copper coil makes it look like a transformer. And beauty of it is they can be pulled off and replaced just a coil of copper windings. I think there are multiple factors that can be affected here.
I will try all. This should be fun.

Plug and pulse...

--giantkiller.

MacCD suggested that pulsing frequency should be low (100Hz). The oscillation you've achieved will then continue to ring at a much higher frequency. Seems like what Steven Mark have got. According to sound spectrum plots discussed on 'Jack Durban' thread, there is some 100 Hz squarewave signal present with a lot of higher frequencies (1.1,2.2,3.3,4.4 kHz).

[buzz-ard]

@ aleks - I've been thinking the same thing - that the pulse frequencies must be fairly low. Reason being that at least some of the output has to be at fairly low frequency. Why do I think this? SM always used a digital meter in the videos. DVMs (in my limited experience) don't like higher frequencies, but his unit displays steady voltage readings. My analog meter has trouble with the frequencies I've been playing with and the scope is needed to see what's going on. I've been pulsing my builds too fast, I think. Does this resonate with any one else?

[giantkiller]

So I expanded my device:
http://www.overunity.com/index.php?action=tpmod;dl=get54
http://www.overunity.com/index.php?action=tpmod;dl=get55
http://www.overunity.com/index.php?action=tpmod;dl=get56

I pulsed the copper at 32hz. It hums. I get sharp narrow spikes at leading and trailing edges.
I'll save the long description tho,
I get no ringing, I did get a run away situation where the coil starts to taken a charge, ramps up, the scope screen fills with waveform, then the fet blows. I have 26 more to go.
Naturally when the middle sections are added the hum gets more pronounced. But no sustained ringing after the pulse like I had before when reading the steel sense coil. I even serially connected all the copper coils around the ring and then feeding that into the steel connected coil loop. That was a reading of 25ma. Humming and not great waveform. At 75ma is when the waveform starts to happen. Above that the fet gets hot and goes into runaway. But the ramping starts and off it goes into greater conduction. It was late. I will have to dig in deeper with other combinations.
I will go back to 132khz just for grins with the middle sections added.

--giantkiller. Hope this was clear...

[Localjoe]

So did you do a little victory dance this mornign when you realized you got the runaway condition......   I sure would have