[sdiy] Switching leds on a constant current source

Paul Anderson wackyvorlon at me.com
Mon Jun 1 03:07:42 CEST 2015


> On May 31, 2015, at 2:24 PM, Rutger Vlek <rutgervlek at gmail.com> wrote:
> 
> Hi guys,
> 
> I'm working on a LED driver that switches between 16 different LEDs with a 4067 analog switch. As I'm using a mix of different LED colors I'd like to stabilize the current thru the LEDs and the current draw from the supply by using a constant current source.

How many LEDs are you driving? You might try going with a current mirror design, with one transistor setting the current. You can then connect multiple subsequent transistors to the base to mirror the same current among multiple devices.


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