Hi I am new here, I have made a simple infra-red LED array and put them in a circuit and installed them in a project box and it all works fine except I am a bit confused as to what value of resistor I need to put in as many on-line resistor calculators only calculate for LED's in series OR LED's all in parallel and not both at the same time.
Each LED's forward voltage is 1.6V and uses 140mA.
I have got two sets of 4 LED's in parallel with each other running of of a 9V battery and have got two 12ohm resistors, one at the start of each LED array. Now I do have dyscalculia which might be why I am getting comfused with what value of resistor I need.
I have attached a basic circuit diagram if that helps, Thanks.
Each LED's forward voltage is 1.6V and uses 140mA.
I have got two sets of 4 LED's in parallel with each other running of of a 9V battery and have got two 12ohm resistors, one at the start of each LED array. Now I do have dyscalculia which might be why I am getting comfused with what value of resistor I need.
I have attached a basic circuit diagram if that helps, Thanks.
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