People building crystal radios find that variable capacitors are getting to be hard to find and expensive. This is a method people can use to do a crystal radio experiment with a home made variable capacitor
As a 35 year old I can see it now when we don't have people like this in the world to fix the problems that will eventually occur we are in trouble. Definitely subbing and thanks
I hope and think that there is a new generation coming up. I plan on doing 2 more about the crystal radio topic but don't hold your breath waiting because I am lazy about making videos.
Good easy to build method for a homebrew variable capacitor. Thanks Ken When I was experimenting with building radios I ended up taking about 6-inches of 3/4” EMT conduit, sliding that over 6-inches of 1/2” rigid conduit and putting about 8-inches of 3/8” stainless steel tubing inside of that. Put a wire lead under some hose clamps on the end of each of the metal tubes and you’ve got a 0-pF to 2500-pF variable capacitor. It was easy for me to make from scrap pieces of conduit as I’m a plant electrician, but the cost of materials from Home Depot for anybody else would be less than $15 and you could probably make 3-4 of them.
