Hi...first post here. Thanks to all for this great software and support. Umm...I don't know electronics much at all.
Just want to check I have the right parts and have understood the calculator for this resistor before I put it together. In particular I am not confident I have the right resistor.
I have bought these OSRAM SFH485P LEDS
http://australia.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=0585236
And this resistor - 75 Ohms
http://australia.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=2943044
I have a 9V- DC - 600ma power adaptor.
The figures I put in the calculator were 9V for the power supply.
- 1.5 V for the LED (I did not total it to 3 LEDS to make 4.5v, should I have?)
- forward current 100ma
The calculator suggested a resistor at 75 ohms 5%.
To make the circuit (a loop) : positive of power supply to resistor (any end I guess?) and then other end of resistor to positive of LED1 then negative of LED1 connect to positive of LED2 then negative of LED2 to positive of LED3 then negative of LED3 to negative of power supply.
Any feedback would be appreciated.
If someone could post a single perfect case explained and stickied I think (assuming there is not one, I did not see it) it would help a lot.