i m working on a RFID reader...which works in 13.56 Mhz.....
i cant find a crystal of tat frequency....... is there any possibility of working if i use 14mhz instead or??? can i design one of tat freq ??
If you use 14MHZ your reader will not be in the license exempt ISM band and will probably be an illegal radio transmitter.
There are plenty of companys that will cut a quartz crystal to a frequency you specify.
In the UK there is quartzlab. **broken link removed**
You can find others with google.