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Crystal Radio--DIY Air Tune Capacitor? Pt1 (4K)
With air tune capacitors getting more expensive/rare, I'm looking for a cheap & easy way to make my own. This is a first attempt that I think has potential.
Warning: the materials used to coat the HDD disk are extremely toxic and should not be ingested or inhaled.
![How to build [and calculate] a variable capacitor](https://i.ytimg.com/vi/jIaRK4tkmu8/mqdefault.jpg)
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