Szczepan Bialek wrote:

napisa³ w wiadomo¶ci
...
Szczepan Bialek wrote:


In AC electrons oscillate. In DC electrons are flowing for ages.
Where they come from?

No; in AC electrons periodically change directions and in DC electrons
flow in one direction only.

An antenna is a device that converts the electromagnetic energy which
antenna intercepts
into AC electrical energy at it's terminals.

A diode converts AC into DC.

The crystal radio antenna has only one terminal. Before the diode is AC.
After the diode is DC.
Where electrons come from?
S*

There should always be a DC path around the diode, or the crystal radio
will not work.

Normally there is a tuned circuit at the input, which consists of a
coil and capacitor in parallel. The DC flows through the coil.

At the output there either is a high-impedance magnetic headphone,
which conducts DC through its coil, or a crystal headphone with a
resistor in parallel for the DC path.

The electrons circulate around the DC path in the receiver.