I've got a bluetooth receiver with blue SMD LED's on that flash to indicate connection status. I would like to take that status LED and replace it with the white LED that's in a switch I have.
The switch is designed for 12-24V circuits and has a series resistor (not sure the value), and I have a 25.2V 6S lipo powering the rest of my system, including a similar switch with LED.
I tried to attach the switch and LED to the receiver with flying leads, I piggybacked the DPST switch just fine and removed the blue LED and wired up the switch LED, it didn't light. So I removed the series resistor in the switch, the LED now lights up but is very dim. See below.
So I thought about using a transistor switch to activate a higher voltage circuit. The problem I have is that the blue LED appears to be switched on the cathode after a series resistor, I don't know where to attach the base of a transistor which would see the right voltage drop. Obviously there's a lot of stuff going on on that PCB I don't know about, or don't understand illustrated as the box around the switch.
I've updated the schematic to show how I thought it could possibly work, but I don't think it will.
I can't figure out what this means for what I want to do, does it sound possible?