no_response
Newbie level 1
Hello.
I am building an 125khz RFID reader based on the many schematics on the net, mostly on microchip's RFID guide.
However, I have tried scanning 2 tags and it didn't work out at all.
**broken link removed**
EDIT : I have mistakenly reversed the PNP transistor on this schematic. It is connected correctly on the breadboard.
I am measuring the voltage at points 1 and 2.
Point1 has a good sine wave at about 20vpk-pk.
Point2 is the somewhat filtered signal.
But when I try to scan tags, nothing changes. No change at all.
I suspect that my coil is bad.
d = 10.5cm
about 110 turns
0.2mm wire
any ideas?
I am building an 125khz RFID reader based on the many schematics on the net, mostly on microchip's RFID guide.
However, I have tried scanning 2 tags and it didn't work out at all.
**broken link removed**
EDIT : I have mistakenly reversed the PNP transistor on this schematic. It is connected correctly on the breadboard.
I am measuring the voltage at points 1 and 2.
Point1 has a good sine wave at about 20vpk-pk.
Point2 is the somewhat filtered signal.
But when I try to scan tags, nothing changes. No change at all.
I suspect that my coil is bad.
d = 10.5cm
about 110 turns
0.2mm wire
any ideas?
Last edited: