Bob Boyce TPU thread

[Bob Boyce]

Sorry I did not post this sooner. I have been recovering from the fatigue of staying with my wife at the hospital during and after her most recent surgery.

Here is a picture of the T650-52 core, how it looks after being taped up and prepared for the winding of the primaries.

Bob

[Thaelin]

===

thaelin

[Bob Boyce]

I finally managed to get an LC meter from eBay. It is a Sinometer model VC6243. Here are the readings taken using it.

Top Flat Spiral 0.293 mH
Bottom Flat Spiral 0.304 mH
Inner Longitudinal 0.284 mH
Outer Longitudinal 1.151 mH
Secondary 6.82 mH

Interesting that both top and bottom spiral windings are identical in diameter, turns, and spacing, and only differ in which side is against the core. Yet they read a bit different.

Bob

[MarkSnoswell]

I have just posted some experimental tests results on longitudinal resonances in a large toroidal core here
http://www.overunity.com/index.php/topic,2877.new.html#new

I dont want to divert the focus of this thread but I do think that these results are significant to understand -- these sorts of resonance will be present in the iron powder core although probably with much lower Q's. I am holding off winding my big core untill I have done more basic research like this -- if you asked me right now I would recommend winding the core in such a way that you dont restrict it's ability to sustain magnetoacoustic resoances.

cheers

Mark

[MarkSnoswell]

I just posted some relevant experimental results here: http://www.overunity.com/index.php/topic,2764.msg51426.html#msg51426

I am still holding off winding the big micrometals core untill I have done more basic experiments. Right now everything seems to make perfect sense -- the experimental results are agreeing with theory. My next major experiment will be to cross modulate the fundamental magnetiacoustic mode with one of it's higher harmonics on the ferroxcube core. I know this should work from experimental results at different bias fields in the core (they strongly modulate the magnetoacoustic resonance frequency). However I want to move onto resonant (blocking oscillator design) drives for two signals -- which will dramatically reduce the input power.

cheers

mark.