Light up 6 LEDs

[Suraj143]

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]

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?

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]

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?

It will basically work. However these days most people use a MOSFET transistor to do switching function, less loss, easier to drive.

Lefty

 

[Suraj143]

Hi I planned to put two 47R resistors

14v-6v=8v

v=ir
8=20/100*R
40=R

 

[ericgibbs]

Hi I planned to put two 47R resistors

14v-6v=8v

v=ir
8=20/100*R
40=R

hi Suraj,
Check that 40R calculation.

Rs = 8V/0.02 = 400R. !!

 

[Torben]

hi Suraj,
Check that 40R calculation.

Rs = 8V/0.02 = 400R. !!

Morning Eric,

You beat me to it!


Torben

 

[ericgibbs]

Morning Eric,

You beat me to it!


Torben

Well I'm still morning fresh.!

Its time for my tiffin.

 

[Suraj143]

Ooooops sorry my mistake it should be 400R so its better place two 470R resistors.

 

[Torben]

Ooooops sorry my mistake it should be 400R so its better place two 470R resistors.

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]

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

Nice to see you are caring.!

Disclaimer:
No LED's were harmed in anyway, while making this project.

 

[Torben]

Nice to see you are caring.!

Disclaimer:
No LED's were harmed in anyway, while making this project.

They're such cute little fellas that I just can't help it.


Torben