|
I am looking at NTE3100 Photon Coupled Interrupter Module datasheet. Emitter Forward Voltage VF IF = 60mA – – 1.7 V It shows 1.7V in the MAX column, they show no value in the MIN or TYP column. Do I use this information to calculate the current limiting resister? I found values on the internet of 2.5k and another shows 150 ohm both at 5VDC. What would be the proper way to use the datasheet to calculate for the resistor. Link to datasheet: http://www.nteinc.com/specs/3100to3199/pdf/nte3100.pdf |
December 27, 2017 |
|
50mA sounds a whole load of current. My approach would be to stick 10k in there at first and see how that works, reduce if necessary. If you are really pushed for speed lower values down to 100 ohms might work better. Both your internet values lie within this range. The reason only a max is given is that the min is zero-ish. To be safe, find a value which just works and then halve it. Hope that helps. mike |
December 27, 2017 |
|
Mike, Thank you for your time. I will probably start with the 10k as you suggested. Thank you. Don |
December 28, 2017 |
No answers yet. Contribute your answer below!
You must log in or create an account (free!) to answer a question.
Anyone can ask a question.
Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.
CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.
We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.
Acceptable Questions:
Unacceptable Questions:
Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!
CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.