Hi,
I am trying to use a SN74LS17 family hex buffer/driver to drive 5 LEds One LED per output). My problem is that the output from each out pin from the device is at 15V and my LEDs (digikey part 160-1579-1) are rated at 5V with 20mA forward current, 100mA Peak forward current.
My question is that that can I just use a resistor to make sure it just provides the right current. I calculated R to be 715 Ohm (based on 20mA,15V). Is this correct?
I'll appreciate any help in this. Thanks in advance.
I am trying to use a SN74LS17 family hex buffer/driver to drive 5 LEds One LED per output). My problem is that the output from each out pin from the device is at 15V and my LEDs (digikey part 160-1579-1) are rated at 5V with 20mA forward current, 100mA Peak forward current.
My question is that that can I just use a resistor to make sure it just provides the right current. I calculated R to be 715 Ohm (based on 20mA,15V). Is this correct?
I'll appreciate any help in this. Thanks in advance.