S Suraj143 Active Member Sep 15, 2008 #1 Hi I want to light up 6 red colour LEDs from a 12V supply (vehicle battery). Don't think about the input part of the transistor the pulse coming from a micro controller. Can anybody tell me is my circuit looks ok? Attachments 6 LED.JPG 6.4 KB · Views: 139 Last edited: Sep 15, 2008
Hi I want to light up 6 red colour LEDs from a 12V supply (vehicle battery). Don't think about the input part of the transistor the pulse coming from a micro controller. Can anybody tell me is my circuit looks ok?
ericgibbs Well-Known Member Most Helpful Member Sep 15, 2008 #2 Suraj143 said: Hi I want to light up 6 red colour LEDs from a 12V supply (vehicle battery). Don't think about the input part of the transistor the pulse coming from a micro controller. Can anybody tell me is my circuit looks ok? Click to expand... hi, Looks OK to me, if you added some component values, we could say for sure. Also draw the symbol for the LED's to ensure their polarity. Last edited: Sep 15, 2008
Suraj143 said: Hi I want to light up 6 red colour LEDs from a 12V supply (vehicle battery). Don't think about the input part of the transistor the pulse coming from a micro controller. Can anybody tell me is my circuit looks ok? Click to expand... hi, Looks OK to me, if you added some component values, we could say for sure. Also draw the symbol for the LED's to ensure their polarity.
Leftyretro New Member Sep 15, 2008 #3 Suraj143 said: Hi I want to light up 6 red colour LEDs from a 12V supply (vehicle battery). Don't think about the input part of the transistor the pulse coming from a micro controller. Can anybody tell me is my circuit looks ok? Click to expand... It will basically work. However these days most people use a MOSFET transistor to do switching function, less loss, easier to drive. Lefty
Suraj143 said: Hi I want to light up 6 red colour LEDs from a 12V supply (vehicle battery). Don't think about the input part of the transistor the pulse coming from a micro controller. Can anybody tell me is my circuit looks ok? Click to expand... It will basically work. However these days most people use a MOSFET transistor to do switching function, less loss, easier to drive. Lefty
S Suraj143 Active Member Sep 15, 2008 #4 Hi I planned to put two 47R resistors Code: 14v-6v=8v v=ir 8=20/100*R 40=R
ericgibbs Well-Known Member Most Helpful Member Sep 16, 2008 #5 Suraj143 said: Hi I planned to put two 47R resistors Code: 14v-6v=8v v=ir 8=20/100*R 40=R Click to expand... hi Suraj, Check that 40R calculation. Rs = 8V/0.02 = 400R. !! Last edited: Sep 16, 2008
Suraj143 said: Hi I planned to put two 47R resistors Code: 14v-6v=8v v=ir 8=20/100*R 40=R Click to expand... hi Suraj, Check that 40R calculation. Rs = 8V/0.02 = 400R. !!
Torben Well-Known Member Sep 16, 2008 #6 ericgibbs said: hi Suraj, Check that 40R calculation. Rs = 8V/0.02 = 400R. !! Click to expand... Morning Eric, You beat me to it! Torben
ericgibbs said: hi Suraj, Check that 40R calculation. Rs = 8V/0.02 = 400R. !! Click to expand... Morning Eric, You beat me to it! Torben
ericgibbs Well-Known Member Most Helpful Member Sep 16, 2008 #7 Torben said: Morning Eric, You beat me to it! Torben Click to expand... Well I'm still morning fresh.! Its time for my tiffin.
Torben said: Morning Eric, You beat me to it! Torben Click to expand... Well I'm still morning fresh.! Its time for my tiffin.
S Suraj143 Active Member Sep 16, 2008 #8 Ooooops sorry my mistake it should be 400R so its better place two 470R resistors.
Torben Well-Known Member Sep 16, 2008 #9 Suraj143 said: Ooooops sorry my mistake it should be 400R so its better place two 470R resistors. Click to expand... Yes, 470Rs will give you a current of 17mA which will be enough to light up 20mA LEDs quite nicely and provide a little breathing room for the LEDs. Torben
Suraj143 said: Ooooops sorry my mistake it should be 400R so its better place two 470R resistors. Click to expand... Yes, 470Rs will give you a current of 17mA which will be enough to light up 20mA LEDs quite nicely and provide a little breathing room for the LEDs. Torben
ericgibbs Well-Known Member Most Helpful Member Sep 16, 2008 #10 Torben said: Yes, 470Rs will give you a current of 17mA which will be enough to light up 20mA LEDs quite nicely and provide a little breathing room for the LEDs. Torben Click to expand... Nice to see you are caring.! Disclaimer: No LED's were harmed in anyway, while making this project.
Torben said: Yes, 470Rs will give you a current of 17mA which will be enough to light up 20mA LEDs quite nicely and provide a little breathing room for the LEDs. Torben Click to expand... Nice to see you are caring.! Disclaimer: No LED's were harmed in anyway, while making this project.
Torben Well-Known Member Sep 16, 2008 #11 ericgibbs said: Nice to see you are caring.! Disclaimer: No LED's were harmed in anyway, while making this project. Click to expand... They're such cute little fellas that I just can't help it. Torben
ericgibbs said: Nice to see you are caring.! Disclaimer: No LED's were harmed in anyway, while making this project. Click to expand... They're such cute little fellas that I just can't help it. Torben