But indeed i got some information about the gadget. Therefore i would like to share with Instructable.
My primary Objectives would be as Follows:-
1. The power source should be compromised.
2. It should be capable of adapting with both the adapter as well as with the batteries.
3. The ease of access should be incorporated like it should have the ability to get along with any of the multimedia device.
4. Could be carried along while travelling.
5. Finally the most important objective, the range should well be increased to about more than the regular given specification.
Step 1: Opening the Shell
But in my case i was surprised because there weren't any screws holding the Transmitter. I tried to pop it open but was unsuccessful. I tried and saw various opening to find if there were any hidden screws holding the unit. To my frustration at the end i found out none. Then by hook or by Crook i had to get inside therefore i made up my mind that i would open it, if also i had to break it.
Then i steady put up a wedge inside the shell and forced it to make a gap. I put a second wedge and again forced to make a more bigger gap. Still i was not able to see any screws from the gap. I continued till there was a breaking point. Then after a final push, there was large pop sound. Here i found out that this gadget was not held by any screws.
The Company had made this product so that it was not serviceable, that no body would be able to open this product. I could see that the legs holding the gadget had broken, and in no way i wold be able to put it back like it would have been before. I had to think for that also. But on the other had i had successfully opened the shell.
I guess this process of fixing it permanent was done deliberately so that no one like me could open it. But nothing was going to hold me back. I had successful opened the shell. But i would like to caution to the reader that this was process that i followed was done in a very slow and steady process, don't hurry up as you may end up damaging the PCB of the Transmitter.
Step 2: The Discovery Inside
I could distinctly see two IC on the board.
I was not able to find the datesheet for the first IC but luckly i was able to find out the details of the second IC, i have also attached the link for further clarification. I was able to find the classfied documents of the transmitter chip IC and i have attached it along here. Follow the link.
What i found out from the datesheet that the Second IC was the brains of the gadget. It was the transmitter IC. The date sheet is also not given in detailed but i found out what the pins are configured for. and particularly the pin for the antennae which was most important for me. It was pin No. 5. After following the track i was able to find out the RF pin out and also found out that the antennae was just a coil of PCB in built wound up tracks which was linked to the earth of the 3.5mm socket. Might be it may be helpful for the projection of the RF signal..
Step 3: Removing the Holdup
Step 4: Attaching the Antennae
Just take a look at the pictures.
It should be remembered that as Antennae is the important part and for the objective to be completed successfully you should follow the steps here very precisely as this is the primary hack for the project.
Now finally to solder the Audio jack to the FM transmitter.
Step 5: Attaching the Audio Input Jack
White = Left channel
Red = Right channel
Black = Ground & Antennae
I connected the White and Red terminal to the board but i didn't connect to the Internal antennae as i thought the RF would be splitted to the on-board antenna.
Step 6: Adding a Seperate Power Supply
I had found out in the manual of the IC that it was not able to handle more that 5V, therefore i had to make my power supply as specified. Then with the help of a simple voltage regulator IC 7805 i made a power supply, along with some filter capacitors, which was also not needed but i thought of adding it. I made it in such a way that i didn't needed a transformer in one end.
I had a lot of switching adapters lying in my house mainly of 12V and i just made a socket, where in i was able to plug in the 12V directly and from the end of the regulator i would get a steady 5V.
Simple as it sounds.
And wala my FM transmitter is ready for the long range coverage.