In order to make this microphone, the author needed such materials: a cork from a plastic bottle, a wire, a plug (tulip), two batteries, an insulating tape, food foil, graphite powder, small bolts and nuts for them. First of all, the author took the cork and made a hole in it for a bolt.
Then a bolt twisted into this hole,
and screwed a nut on it.
on the second bolt he sewn his hat
and stuck it to the cork
then poured graphite powder into the cork,
applied glue along the edge of the entire lid,
and sealed with foil.
he cut the excess foil
leaving a piece on against the bolt that stuck.
then folded the foil to the bolt
on against the glued bolt in the foil made a hole
put the foil on the bolt
and tightened the nut.
The foil should not touch the early screw.
Then the author took the wire and screwed the ends to the bolts.
screwing nuts on top.
the other end of the wire connected to the batteries and the tulip like this.
And isolated.
Then he connected the tulip to the speaker.
Turned on the column.
And he went on to test, adjusting the volume on the speaker. Everything works.
Video clip with the creation of a microphone: