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I want to make a battery less radio (known in early days as crystal radio) with Just one diode. Will it work?
I dont want a tuner (just to keep things bare minimum). So I avoid the coil and capacitor (tuner). Which means this radio will pickup all the frequencies, which is fine. This means circuit will be an antenna, a diode, then headphones ( in that order, in series) connected to ground. How long antenna will have to be. Also, will this work ?
Depends on what you mean by "work". You will get a very soft hiss in the headphones. The antenna should be at least 21 cm, but the longer the better.
No tuner = get all stations at once. But really, your antenna will act as a broad tuner.