I have rgb led common cathode.
I want to make basic OFF-ON spst switch.
When the power is off i want the led to be red and when i press the switch button i want the led to change to green.
At present I connected the red pin of the led to the main positive 12v power supply and the green pin of the led to the switched positive pin but then when I press the switch i get mixed red and green led lite.
How to fix that?
I will appreciate circuit schematic.
Thanks.

 

I have rgb led common cathode.
I want to make basic OFF-ON spst switch.
When the power is off i want the led to be red and when i press the switch button i want the led to change to green.
At present I connected the red pin of the led to the main positive 12v power supply and the green pin of the led to the switched positive pin but then when I press the switch i get mixed red and green led lite.
How to fix that?
I will appreciate circuit schematic.
Thanks.

Seems like a hex inverter or a small number of transistors and passives would get it done. Any particular limits on what kinds of parts you want to use or where it has to fit?

 

Double pole double throw switch ? One position red is on, green off,
the other the inverse.

Regards, Dana.

 

Double pole double throw switch ? One position red is on, green off,
the other the inverse.

Regards, Dana.

By far the simplest solution!

I'm not sure why the thread starter specified spst switch, but if that requirement is flexible, that's the way to go!

 

Take a pic of your wiring, post a schematic. Even a SPST should work.

Regards, Dana.