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Hertz RFID Reader

Source: Internet
Author: User
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Hertz RFID Reader

• A small circuit to read RFID badges operating at (EM4102)
• This circuit is used here:coffee Tally sheet kaffee-strichliste

Reading rfid-badges operating at + kHz is very easy. You just has to put a carrier (A-Z) into the air and has the badge do the work. The badge would do the ASK (amplitude Shift keying) and your only has to monitor the envelope of the carrier. This can is done by a simple diode rectifier.

The carrier is generated by a 74hc4060 and a 4 MHz crystal. Using "Q4" delivers the desired kHz signal. The AM demodulator is build of a AA113 (for historic reasons) and R5, C5. The demodulator is followed by a limiting amplifier. The voltage across the coil is about VPP.

The envelope of the carrier, when a Tag/badge was brought close to the coil ...

Hertz RFID Reader

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Related Keywords:
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