Instructables

How do i control multiple LEDs connected to separate batteries with one on/off switch?

Hi there!

I'm trying to power a toy with LEDs they are around 3v and i'm trying to power atleast 4-5 of them with 2xLR44 to each LED.  and it needs to be as compact as possible.  I was unable to power multiple ones in a series with enough cell batteries and times ticking (for a project). so i've decided to wire the LEDs to 2 LR44 each, is there someway to place something in between each battery and be able to connect it to an on/off switch somehow?  or is there a better way? thanks for your time

bwrussell2 years ago
A DPST (Duel Pole Single Throw) Switch can turn two circuits on and off at once. You could come up with a mechanical device that moved multiple switches. Some thing as simple as gluing a piece of stiff material across both sides of each switch, assuming you're using a rocker switch. When you pressed on any switch it would switch all of the switches together.
Need to know the forward volt drop and LED current.
williamhaze (author)  steveastrouk2 years ago
Thanks for looking!

Emitted Colour : Orange
Size: 5mm

Lens Color : Water Clear

Forward Voltage (V) : 3.0~3.2

Forward Current (mA): 20mA

Luminous Intensity: 10000~15000 mcd

View Angle: 25 degree
By far the simplest method is to get some more volts in there. Anything else is likely to be much more complicated than ....10 LR44s in series....

You are probably not even turning ON these LEDs at their full potential.

If you are stuck for space, you can use chips to boost the battery voltage up to what you need to drive 5 LEDs, at the expense of sucking a lot more current from the battery.

Steve