How work wireless keys?
Inside the coil, closed on a chip. When you hit the key in the electromagnetic field of the reader coil current begins to flow, which is powered chip. At power up the chip starts to give out to the winding sequence of pulses-sewn in the key code.
We analyze key wireless doorphone
Broke down the contactless key doorphone. Just stopped working.
Before you throw decided to take it apart and examine the inside.
He understands podkovyrivaniem round cap somewhere along the groove.
See inside the coil of thin copper wire and mikroshemka. Continue to dismantle ...