Selfrunning cold electricity circuit from Dr.Stiffler

[zaydana]

Sorry to be a bother, but does anybody know where to purchase BaFe cores? The original eBay seller doesn't seem to sell them anymore.

If obtaining cores proves to be a problem, does anybody know how I'd go about making my own cores from BaFe powder?

[amigo]

Sorry to be a bother, but does anybody know where to purchase BaFe cores? The original eBay seller doesn't seem to sell them anymore.

If obtaining cores proves to be a problem, does anybody know how I'd go about making my own cores from BaFe powder?

680uH cores here

[zaydana]

Hmm, i've seen coils like that around before, but I thought they needed to be Barium Ferrite? If not, I could probably grab some from the local electronic components store. Can anybody confirm those coils working?

[DrZLowe7]

I am the Ebay Seller that sells the 680uh ferrite coils. They are the ones used Dr. Stiffler as I sold them to him. I logged in to this site to see what all the commotion was about. OU  interesting.

[hartiberlin]

Hi Harti
The reason the voltage drops on the test circuit at self resonance is that the measurement circuit  is in SERIES with the coil. 

Yes,but in the circuit diagram he is showing it being measured across the 50 ohm load resistor.

If the series LC circuit atresonance has about less than 1 Ohm impedance, all
voltage should be at the 50 Ohm resistor, so the voltage should
be maximum at resonance, not lowest... or do I mix something up here ?