3 transistor AM radio 700 KHz - 1.6 MHz
Автор: radiofun232
Загружено: 2011-11-12
Просмотров: 12994
The radio works on 12 Volt. A simple radio usable for local radio stations on AM between 700 KHz and 1.6 MHz. You need an external antenna from approx 10 meter outside or an indoor antenna from approx. 4 meter. Connect an indoor antenna directly to the base from the first transistor ( max. 2 meter long) or use a coupling capacitor between 100 P and 500 P (2 - 4 meter long). Experiment a little bit with the antenna capacitor. With a 10 meter long wire antenne outside you can receive radio stations from approx. 600 km or more far away. I received radio China, a radio station from the US and radio stations from eastern europe. The second transistor has two functions: tuning + oscillator. In the oscillator mode the oscillator is modulated by the antenna signal. This gives a better selectivity and better receiving results. You can find more sophisticated + easy to make radio schematics (superheterodyne) in my books (author Ko Tilman), "Retro Radio" (Dutch text), published by Elektor International Media in the Netherlands, and "2-10 MHz Shortwave receiver and 1 transistor VFO's (published by Lulu on the Lulu website). Corrections to the video: BF 547 b = BC 547 b, "condensator" (Dutch) = "capacitor".
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