Uploaded November 2023 | Updated September 2026, 2 weeks ago

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This is a very usable version. The main improvement is in the commutator. It is much quieter and reliable. I have implemented it in the full scale version.

Crystal Radio Variometer Pt 6 - Protoype Is Done! Will It Work?!?!
youtu.be/9PO__GsDkAg

Crystal Radio Variometer Pt5 - Ball Is Done!
youtu.be/DCI8sSCJbQc

Crystal Radio Variometer Pt4 - Better Yet!
youtu.be/Nzp4hJsnCSU

Crystal Radio Variometer Pt3 - Design Improvements
youtu.be/ooQ8eOIXAaM

Crystal Radio Variometer Pt2 - Winding The Ball
youtu.be/T25Eq2C1iSk

Crystal Radio Variometer Pt1
youtu.be/RgJen7UGZ4M

I have the updated 3D printers files posted on line here: thingiverse.com/thing:6290893
printables.com/model/632114-crystal-radio-variometer-aka-vario-coupler