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Crystal Radio Reciever with Amplifier - Circuits DIY
https://circuits-diy.com/crystal-radio-reciever-with-amplifier/
Crystal Radio Circuits - techlib.com
http://techlib.com/electronics/crystal.html
Can I connect an amplifier to a Crystal Radio?
https://electronics.stackexchange.com/questions/227265/can-i-connect-an-amplifier-to-a-crystal-radio
The crystal radio gets all of its miniscule power directly from the energy in the radio signal that it picks up. It is tiny. As a result it can only power a high impedance (high resistance to AC signal) crystal earpiece. The input impedance of these is typically 20 kΩ.
How to Make Crystal Radio Amplifier for Speaker - YouTube
https://www.youtube.com/watch?v=JtPwxbOgBHw
Learning Electronics — 2. Fun with Crystal Radio and ...
https://rayshobby.net/wordpress/learning-electronics-2-crystal-radio-and-extensions/
The Basic Version. The basic version of crystal radio that I learned as a kid consists of just 7 components as shown below. In fact, the resistor R is optional, making it only 6 components. There is an inductor L, variable capacitor C, diode D, high-impedance earphone (you can use a piezo disc), and antenna and ground.
A Crystal Radio Amplifier In A Jar | Hackaday
https://hackaday.com/2013/08/11/a-crystal-radio-amplifier-in-a-jar/
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