Crystal radios
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Radio frequency coil
File:International Labour Day Edit-a-Thon - crystal radio with crystal diode and dual slide tuning coil.JPG - Wikimedia Commons
Figure 1: start winding the coil like this
Connecting the Crystal Radio Coil
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![Shortwave [Sw] double coil Crystal radio + audio amplifier. - YouTube](https://i.ytimg.com/vi/wZjPqmQT57o/hqdefault.jpg "Shortwave [Sw] double coil Crystal radio + audio amplifier. - YouTube")
Shortwave [Sw] double coil Crystal radio + audio amplifier. - YouTube
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My Crystal Radio Page
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Crystal Radio Design Page
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1 - .13 variable RF inductor old PC mount antique radio coil transceiver tuning | eBay
Servicing R.F. Coils, June 1940 Radio-Craft - RF Cafe
The AA8V 6146B Amplifier - Plate and 10m Tank Coil Construction Details
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Radio frequency coils
