Electronics on the floor: Another sliding variable capacitor

Another sliding variable capacitor. Goes up to about 30pF.
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[@joeshmoe7899]

Did this with 2 beer cans. Split one, and slide it over the other. Wire on both ends. 10 to 400pF. Cans already have an insulating wrap.

[@tvdylan]

400 pf ! pretty good ! is it the general rule that the more surface area the more pf's we get ? i imagine the two cans slide nice n close to each other too !

[@bobhs1605]

Really ? They have an insulating wrap? What about after heating them up to remove the ink?

[@bobhs1605]

And would sanding them make a difference?

[@sirsteamtrain7913]

​@bobhs1605 sanding them would remove the incredibly thin plastic coat they have on the inside.

[@MidlifeRenaissanceMan]

You’ll find that 20mm grey conduit slides nicely inside 25mm grey conduit.
Orange conduit is a little thicker and so 25mm slides inside 32mm
Using the 25mm grey conduit on my 3m wide 40m mag loop, I would blow holes with RF arcing in the conduit with as little as 30-40W

[@sadunnakipoglu9471]

Thank you so much for this video.

[@rcpilothamradio4503]

Outstanding HB9DHH 73 from Rene

[@DomeArmin]

only from 5pF to 24pF
☹
I wanted to build an AM loop antenna -- but this method is not enough with it's insufficient super-tiny capacitance. 🙁

[@paulromsky9527]

I am in the States. Can I use Aluminum? We can't buy Aluminium here.

[@souptiksamanta]

Thanks❤❤

[@michaeljoshuamanallo1742]

I made a small one just a fingers size and it has capacitance of 30 to 100 pf

[@Saber522]

How

[@Esteban_Pascazzi_LU8ATK]

For loop your yellow copper wire is very resistive loosy....replace a copper wire with copper tape or aluminium foil....remember 10 cm this copper wire degrade eficience in your loop antena....sorry my english is very bad

[@markg6jvy135]

👍👏👏