The fascination with radio began tinkering with a simple Detektorempfaenger, one of the few circuits that can do without power, to modern PLL synthesizer circuits

Here you will find Schematic Circuit Diagram for DIY and further information on Receiver and detectors
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Small Mittelwellenempfaenger with the ZN414	www.electronics-lab.com/projects/rf/008/
FM receiver with only one (!) Transistor	www.somerset.net/arm/fm_only_one_transistor_radio.html