Hi, I am trying to make a mock F1 steering wheel with light up LED's, but I don't know how to find out the what strength resistor's to use or if it is even possible
Basically I would like to power 25 LED's in 7 different series (with a 9v battery), but they all have different drop rates. 4 have 4 LED's and 3 have 3LED's, but they are all different colours. The LED's only work at 20mA. I think the drop rate for 3 of the series have 8.8v, 2 have 6.6v drop, 1 has 5.1v drop and 1 has 6.8v drop (sorry if thats really confusing!).
Basically, can it be possible to power all 7 series even though they all have different drop rates and as each series will have it's own switch will the amount of voltage going through each series change when some of the switches of off?
Any comments appreciated!
Thanks
Dan1996
Basically I would like to power 25 LED's in 7 different series (with a 9v battery), but they all have different drop rates. 4 have 4 LED's and 3 have 3LED's, but they are all different colours. The LED's only work at 20mA. I think the drop rate for 3 of the series have 8.8v, 2 have 6.6v drop, 1 has 5.1v drop and 1 has 6.8v drop (sorry if thats really confusing!).
Basically, can it be possible to power all 7 series even though they all have different drop rates and as each series will have it's own switch will the amount of voltage going through each series change when some of the switches of off?
Any comments appreciated!
Thanks
Dan1996