Difference between IR receivers

[ayan_m]

What is the difference between TSOP 1833 and 1738 other than the frequency range?
Is there any way in which the change in IR frequency can be detected? Also is it always necessary to have a different supply for IR LED and IR reciever ? If so which one should be more?

 

[electron_boy]

tsop 1738 will receive ir signal with freq 38-42KHz.it is not necessary to have different power supply for IR led and rxr

 

[manu]

TSOP1738 is slightly easier to usebut it is physically bigger than TSOP1833.
Regards,