Confirming the Delayed Lenz Effect

[Magluvin]

I am using the term pseudo-bifilar coil to distinguish it from a true bifilar coil to avoid confusion in case people start talking about true bifilar coils.  The drawing in posting #982 is a pseudo-bifilar coil.  I discussed the bullet points in that drawing in an earlier posting and unfortunately they are misconceptions.

What is a true bifilar? 

Mags

[MileHigh]

A true bifilar coil is two windings with either four terminals or three terminals.  Three terminals means at one end they are joined together but there is an electrical connection made.  It means that two independent currents can travel in the two windings.

[Farmhand]

Just a mention about coil capacitance, isn't the best way is to determine it by experiment ?

With air core solenoids we can use calculators and compare with what is observed by experiment to confirm.

eg. if I take a coil wound to whatever specs and put the values into this calculator http://www.extremeelectronics.co.uk/calcs/index.php?page=oltc_calc.php
it can tell me the coils self capacitance and it's inductance as well as the effect of adding a known capacitance.
So if we know the inductance and we find the resonant frequency then the capacitance needed should be simple, by using
this calculator http://www3.telus.net/chemelec/Calculators/LC-Calculator.htm we can put in the inductance and adjust the capacitance to get the observed
resonant frequency by experiment (function generator and scope).

some more calculators.

Spiral coil calculator
http://www.deepfriedneon.com/tesla_f_calcspiral.html

This one doesn't seem to work for me, but I'll include it because i might not be using it correctly.
https://www.rac.ca/tca/RF_Coil_Design.html

Wire properties guide
http://www.rfcafe.com/references/electrical/wire-cu.htm

Cheers

[Magluvin]

A true bifilar coil is two windings with either four terminals or three terminals.  Three terminals means at one end they are joined together but there is an electrical connection made.  It means that two independent currents can travel in the two windings.

I see these used in switching supply transformers. I had not ever read the term 'True bifi'.

Its just like having separate secondary windings(outputs) but they have a common connection at the beginning or end of the wind.  Ive seen some audio transformers that claim bifilar windings, but I dont think they are series wound like Tesla intended. I have some files on that stuff. Would have to look deep.  Maybe I can find it easier online. But it is something different totally.

Mags

[Magluvin]

Just a mention about coil capacitance, isn't the best way is to determine it by experiment ?

I agree. I have not seen a series bifi coil calculator. Will be interesting to 'determine by experiment' 

Mags