Transistor Driving LED

[soumen21]

Hi, I have a transistor driven by controller pin for ON/OFF of LED. My question is, how can I use the a single tranistor to drive two LEDs. So that when I make controller pin HIGH, RED led glow and when I make controller pin LOW, green LED turns ON.

 

[barry]

You don't tell us what kind of leds you are using: back to back? common anode? two separate leds?

Maybe something like this would work... (D3 should be a schottky)

 

[Audioguru]

The base current exceeds the LED current so the transistor has no current gain.

 

[soumen21]

You don't tell us what kind of leds you are using: back to back? common anode? two separate leds?

Maybe something like this would work... (D3 should be a schottky)

I have the option of choosing either common anode or common cathode LED. So this led will be a three terminal device.

 

[barry]

Then you can't use that circuit. And I have no idea what post #3 means.