Picture of Cannon 500d external mic mod
Hidden screw.jpg
If you have Cannon 500d you know already that it doesn't have a external mic jack. But you can add one within a couple hours.  

XCFloresX photography does an awesome job of this mod on a youtube video. Watch his video first! 

My instructions are just a specific case for my camera and the 3.5mm jack I chose to use. I have the Asian model not the Rebel.

Make sure you get all the screws out before you remove the back case. The back case comes off quite easy. My camera had a screw hiding below a sticker.  

When you take the back cover off be careful not to damage the ribbon attached to the circuit board.  

Small Philips screwdriver - make sure it fits properly in the head,  these little screw heads will strip out easily.
Small Flat screwdriver - to pry off the back cover.
Hot Knife or a small saw, something cut plastic 
Soldering Iron
Small file or Dremel 
3.5 or 2.5 2 pole  audio jack

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Step 1: Placing the Jack

Picture of Placing the Jack
As you can see in the picture, the jack body is a little too wide to fit in.So I used a pair of bolt cutters to cut the material in yellow out.

Step 2: Soldering the Jack

Picture of Soldering the Jack
Be careful cutting the internal mic wires. Allow your self enough wire to work and stip the wires. They are very tough to strip!
And I also bent down the jack tabs to ensue the back case would fit back on.
The back cover has a metal shield inside it so I added a small piece of electrical tape to ensure the jack contacts didn't short out. 

Step 3: Back cover material removal.

Picture of Back cover material removal.
Material removed.jpg
The yellow shows where I had to remove material from the back cover. 
I used a hot knife to remove the plastic and then a grinder to remove small amount of metal required.

NOTE: Try not to get any small bits of plastic or metal into the body of your camera. Nothing good can come from that.