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Adaptor Schematics

• About the Adaptors
• Building an Adaptor
• Additional Information

About the Adaptors
These adaptors are designed to give the calculator the ability to play sounds through speakers or headphones. There are two types of adaptors, the first one is mono so you can only hear mono sounds, the second one is a stereo one so you may hear stereo sounds. The stereo adaptor can also be used to plug in 3.5mm cords from calculator to calculator so you may use other cables as a TI-TI link.

Building an Adaptor
There are two ways to make your adaptor, the easiest way is to buy a 2.5mm Stereo/Mono to 3.5mm Stereo adaptor and to file away the metal/plastic (around the 2.5mm plug) so that it will fit into the calculators port. You can use a 2.5mm Mono to 3.5mm Mono adaptor but if you plug in stereo headphones or speakers, sound will only come out of on of the speakers.
The other way is to solder a 2.5mm Stereo/Mono Plug to a 3.5mm Stereo socket and to file away the metal/plastic (around the 2.5mm plug).

The Schematics

Materials Needed Equipment Needed
  • Soldering Iron
  • Wet Sponge
  • Solder
  • Clamps and/or a vice to assist you
  • Wire Stripers and Pliers.
  • Multimeter
  • File to file away metal and/or plastic

Set up and Safety
When soldering make sure you are in a well ventilated area due to the fumes created by the heated flux in the solder. Once you have finished soldering make sure you wash your hands because the solder contains a small amount of lead, which is poisonous and can penetrate your skin if you don't remove it. If you are worried about this fact you may use gloves but they hinder the mobility of your hands. To be extra safe, wear glasses for eye protection and an apron so you don't burn your clothes by accident.
When setting up your work area have everything neatly in their places so you can easily access everything. The sponge is used to clean the tip of the soldering iron when it becomes dirty.

Detailed Instructions
  1. Carefully strip the cable and the cables inside on both sides. If you have a 4 or more core cable either combine the left over wires to with the earth wire or cut them off.

  2. Twist the individual wires (including the shielding) and pre-solder them.

  3. Before attaching the cable to the 2.5mm plug and 3.5mm socket, file away some of the metal and plastic around the 2.5mm stereo plug so it will easily fit into your calculators port. You don't need to do this step if the plug already fits into the port of the calculator with out being hindered by the plastic around the port of the calculator.

  4. Slide the two covers for the plug and socket onto the cable (the right way around).

  5. Solder the wires on the corresponding contacts on both the 2.5mm Stereo plug and 3.5mm Stereo Socket. If you are using a mono adaptor combine the Tip and Middle wires. If you have a shielded cable use the shielding as earth (bottom/base, the biggest contact) and the other two cables as the tip and middle. Make sure that the two ro three wires don't touch each other.

  6. Use a Multimeter to make sure that everything is connected correctly.

  7. Your Adaptor is now complete.

Additional Information
Check out our Features article to find out how to play sound on the TI.
These Adaptors also work with audio devices with 2.5mm sockets

The displayed information is provided on an 'as is' bases, Pacmeb and any one associated with Pacmeb or this information is not responsible for the usage of this information and there for isn't liable for any damage resulting from it. The authors of the software listed and the creators of this device aren't responsible for any damage this information may cause.

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