Instructions for installing an amplifier into your Ti-84 Plus

This can BREAK your calculator so I recommend NOT doing this, but it is still fun to do.

Only do this if you fully understand the risks and your calculator.

Doing this voids any warranty you may have.

I can not be held responsible if you screw this up.

The supplies you will need are:

a small screwdriver. I recommend a glasses repair screwdriver.

a dremel tool

a small drill bit for the dremel tool

a cutting bit for the dremel tool

a soldering iron

solder

a 6v amplifier circuit w/o case

a pair of needle-nose pliers are also nice, but you could probably do without.

Here is a link to a photo of the inside of a Ti-84. I also have included the photo with this document. http://www.datamath.org/Graphing/JPEG_TI-83PLUS.htm I did not have ANYTHING to do with the photos.

1.You have to open your Ti Calculator. I personally used a glasses repair kit screwdriver. This was the only screwdriver I could find that was small enough. DO NOT LOSE THE SCREWS AS YOU WILL NOT BE ABLE TO FIND REPLACEMENTS! I have tried.

2. I had to cut all of the grid things off of the back of the calculator case. I used a dremel tool.

3.You have to drill some holes into the case. I drilled 4 above the speaker and 3 for the switch (I had to put some screws to mount it.)

4.You now have to CAREFULLY peel the foil shield back. I had to solder the positive input on the amplifier circuit to the middle pin on the I/O. The I/O is the one on the right when looking down on it. I wired the ground input to the ground input on the battery. It worked great.

5.What you have to do now is to wire the positive and ground current to the pins at the bottom of the calculator. Look at the pins to see which is ground and which is positive.

6. Now you have to rip the top off of a resalable baggie so you can put it between the amplifier circuit and the foil shield.

7. Now place the speaker above the speaker holes and the amplifier above where ever you can(above the hole for the switch hole if the switch is on board.)

8. Now screw the case back together.

Now you should be able to turn the switch on and be able to use sound from programs like Omnicalc and RealSound without any annoying headphone thing.