Can I use Crystal RAdio without variable capacitor and change it to normal capacitor like to the appliances?

Question

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Answer 1

The variable capacitor is used for tuning in stations. The capacitor is associated with an inductor to provide a resonant circuit. The resonant frequency is changed when the capacitor is varied, and you will receive a station when the resonant frequency of your circuit matches the transmitter frequency of the station. If a variable capacitor is hard to get, an earlier answerer to this question told you how to make the inductor into the variable element for tuning. it is a good idea, and much easier than trying to make a variable capacitor.

Answer 2

even for crystal radio, a commercial capacitor is used as it make tuning easier. you can wind your own coil, that is not so critical. the problem with home built caps is it is not easy to get a high capacitance value needed to tune in the AM broadcast band. You can use the 2-sided printed circuit board to make a fixed cap but then you will have to make the coil tunable, a much more difficult chore, that is how the "Boy Scout" kits worked when i was a kid, and they weren't very satisfactory. And you will still have to make the hour drive to get the PCB material. if you live a hour from a major city, it is possible that there won't be a local AM station that can be received by a crystal detector either. crystal sets are not for weak signals.