Quote:
Originally Posted by WM6
In this case, you will also need fixed humidity otherwise the thing will not work.
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Esteban's battery. Without humidity, this doesn't work. Here an example. Voltage is zero (or not enough for to manage the fet) without the water. Also you can comprobe that a fet can work only with few milivolts and obtain very noticeable signal. Maybe in the soil the good conductive metal show this process, in consideration humidity of the soil too.
In the diode question thread I notice that with 4 Ge high quality diodes in serie can amplify big. Maybe this don't have relation with this theme, but... sorry, I have strange ways of seeing things.
I save the old parts of the experiment, you can see below the schematic.