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Old 13th Jan 2019, 5:18 pm   #10
TonyDuell
Dekatron
 
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
Default Re: "The Works" Crystal Radio

No, there's no resistor in parallel with the earpiece. And no capacitor in the tuned circuit. I guess it relies on the stray capacitance between the aerial and earth.

The only components are the adjustable tuning coil (which you wind yourseld on a cardboard tube then sand off the enamel to provide a contact point for the adjustable tap thing), a diode, and the crystal earphone.
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