Variable inductor easy to build - my own design (video)

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Hello everyone.

I uploaded a video with an easy to build variable inductor for experimentation (single coil).

My version varies from 200uH to 5mH just for experiment (of course that more wraps will change the range).

My own design of variable inductor for Stanley Meyer Water Fuel Cell experiments. Easy to build.
This one goes from 200uH to 5mH

Partlist:
- 1x 20mm ferrite rod with 9.5mm or 10mm diameter (old radio AM coil)
- 1x transparent tube for fit ferrite into coil (13mm outter diameter and 10mm inner)
- 1x VD tube (the electrical white tubes) for coil former
-  Insulation tape
-  Lots of enamelled wire
-  Patient (lol)

What do you think?

Anyone designed a similar one?

The video:

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Nice one, i made one with a c core inside a case with electrical connections... i use a bolt to change the inductance... the coil is fixed in a way the its half fixed to one of the cores...

i used pieces of antena to make it slide perfect and springs to make it very fine tunable..

In my case i connect it to a tap in the choke... and the "isolated ground" point...

with my pll i was able to change the frequency of the resonance by changing this value and the pll followed and kept at resonance without changing any other button... i could  vary in one test from 65khz to 110khz...

Compliments !