Instructables

How to build a 1/8in. (3.5mm) stereo audio switch with Legos

Picture of How to build a 1/8in. (3.5mm) stereo audio switch with Legos
I came up with this idea when I was setting up my new computer.  I have two computers, and I wanted to run the audio into one set of speakers.  My first thought was to just buy a simple 2 female to 1 female 'Y' connector, but that apparently can cause problems if both sources are playing at the same time.  Then the idea for a switch came to mind, but what to put it in?  LEGOS!  Great idea!  So let's get into it.

First off, we need to get together our supplies.
You will need these tools:
Solder Iron
"Helping Hand" holder
Hot glue gun
Rotary tool with cone grinding bit
Wire stripper
Wire cutter
Scissors
Ruler
Needle Nose Pliers

The supplies are as follows:
Solder
Wire
3x female 3.5mm stereo panel mount audio jacks
1x DPDT toggle switch
Hot glue
3 male to male 3.5mm cables, or whatever 3.5mm cables you plan on using (male to female, male to RCA, etc)
and, of course, LEGOS!
 
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Step 1:

1. Cut the lengths of wire you need for this project.  I used red, black, and green wire to differentiate between the left, right, and ground connections.  I always find it better to make the lengths longer than necessary, since you can always coil or cut off the excess.

Strip about 1/4" to 1/2" of each end of the wire lengths.

Step 2:

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2. Solder the lengths of wire to the 3.5mm audio jacks.

Put the stripped bit of wire through the proper hole, and bend it over on itself using the needle nose pliers or your fingers.

To save yourself the frustration, use the Helping Hands to hold the jack and wires in place while you solder the wires to the connections.

For my connections, I used green wire for the ground, red wire for the right connection, and black for the left connection.
yaneev1 year ago
wonderful, and so beautifully explained, that i got the confidence to do it myself now :)