Help and advises for two LED's driving circuit.

[MikeMl]

I have lots of two-pin bi-color LEDs around here... These two-pin red-green LEDs are available from DigiKey. They should be readily available from Bangood or EBay.

If you must use a three-pin LED, it would be easier to redesign the circuit to use a common-anode, rather than a common-cathode one like you show.

 

[milkoni]

Thanks Mike,
I understood, but I have some three-pin LEDs - about 20, with common cathode and would like to use them. I'm going to try to change the circuit.

 

[milkoni]

May be this is not a elegant solution, but it seems that will work with my three-pin common cathode LEDs.

 

[MikeMl]

Looks similar to what I was working on. Check the sensitivity to variations in the 12V power supply as I am doing here:



Yours has a bit more Amber in the overlap.

 

[milkoni]

I think that your decision is better!

 

[milkoni]

Hi all,
I've decided to build a circuit for MAP sensor indicator with a LM3914. It working fine, but in dot mode the first diode always lights smoothly. How to resolve this problem?
I've attached the simulation image and circuit file.