Crystal Radio--No More Variable Capacitor Designs? (4K)
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HAM RADIO: Building a Variable Capacitor, DIY Capacitor, Magnetic Loop
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Crystal Radio--Hi Q Hoop Coil--Copper vs Litz (4K)
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Rádio caseiro sem eletricidade. Fabricado artesanalmente e seu curioso funcionamento
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Crystal Radios: No Batteries? No Problem!
8:01
Make a Crystal Radio Receiver - Part 2 - Making and Building the Scout's Crystal Set
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Crystal Radio--How To Make The Best/Easiest One - No Batteries, No External Power 2024 (4K)
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How to build [and calculate] a variable capacitor
8:48