Aluminium plates put into the right cylindrical shape.
Soldered the aluminium cylinders, so they could keep their shape.
Soldered aluminium cylinder.
3D-printed parts for the structure.
Begin of the assembly, no drive mechanism is installed yet.
Trombone capacitor at his most outward position, this means the lowest capacity possible.
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Trombone Capacitor

The Trombone Capacitor came into life together with the butterfly capacitor. I designed and build both of them, to see at the end which would be a better fit for the magnetic loop. The trombone capacitor started out off 2 aluminium plates with a thickness of 0,5 mm. They both were put into a cylindrical shape and were than soldered to keep this shape. The design included aluminium rods to make up the structure, these were later replaced by plastics tubes, due to a big influence on the capacity. The blue parts are 3D-printed in PLA to make up the structure together with the alu/plastic rods.

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Niels Baele
Engineer Zottegem, Belgium