Punch machine coil

The punch card reader coil is an important part of the punch card equipment. The coil in the punch card machine plays the role of receiving the radio frequency signal emitted by the punch card machine, feeding back data and providing power for the card. The basic principle is that the radio frequency reader sends the IC The card emits a set of electromagnetic waves with a fixed frequency. There is an IC series resonant circuit in the card. The frequency of the reader coil is the same as the frequency emitted by the reader. In this way, under the excitation of electromagnetic waves, the LC resonance circuit will resonate, so that the capacitor has the same frequency. At the other end of the charge, there is a one-way conduction electron pump, which sends the charge in the capacitor to another capacitor for storage. When the accumulated charge reaches 2V, this capacitor can be used as a power supply for other circuits. Working voltage, transmit the data in the card or accept the data of the reader.

The punch card equipment produced by the punch card reader reader coil is mainly used in access control systems, ID card systems, bus card systems, attendance systems, security systems, etc.

Dimensions (mm)