Do these have a built in resistor?

neutron7 · 20th September 2009, 02:02 AM

These I am going to use these for a project

Physical guitar synth (in that key contraption in the rendering near the top)

they are omron photo interrupters have an LED and photosensor, which will be connected to Atmega chip(MIDI controller), but i can not tell if they need an external resistor for the LED. i am designing boards now so it would be a good time to find out

I have the parts already, is there something i can measure to tell if the LEDs have a resistor? i would think they wouldnt because it would give more options for supply voltage.

Data sheet for the opto sensors.
sorry its a PDF.
EE-SX398/498

star882 · 20th September 2009, 06:10 AM

No.

neutron7 · 20th September 2009, 06:23 AM

Ok thanks

I have just been working on the board, and i included resistors

20th September 2009, 02:02 AM	#1
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	Do these have a built in resistor? These I am going to use these for a project Physical guitar synth (in that key contraption in the rendering near the top) they are omron photo interrupters have an LED and photosensor, which will be connected to Atmega chip(MIDI controller), but i can not tell if they need an external resistor for the LED. i am designing boards now so it would be a good time to find out I have the parts already, is there something i can measure to tell if the LEDs have a resistor? i would think they wouldnt because it would give more options for supply voltage. Data sheet for the opto sensors. sorry its a PDF. EE-SX398/498

20th September 2009, 06:10 AM	#2
star882 diyAudio Member Join Date: Mar 2007	No. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

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20th September 2009, 06:23 AM	#3
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	Ok thanks I have just been working on the board, and i included resistors

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