In this instructable I will give you step by step instructions on converting a pair of genius speakers to run off two 9V batterys.
For a couple of months I have ben working on trying to perfect a lm386 amp but gave up after I contuied getting bad static quality. I picked up a pair of geinus speekers wich I liked the quality of. And I then thought that they would never possiably need 240V to run so I opend them up and found out that they had a 240V to 9V step down transfourmer so I set to work converting them to run off 9 volt batterys.
Step 1: Parts & Tools.
Tip cleaning sponge.
Wire stripper (not showen in picture).
Soldering iron gas (if you have a gas soldering iron).
2 X 9 volt battery snaps.
2 X 9 volt battery.
Genius speakers (SP-K06).
Step 2: Remove Front Plate.
Step 3: Open Up.
Step 4: Working Out How Much Current You Need.
Step 5: AC to DC?
DC stands for direct current and means that one wire is always positave and the other is always negitaive or grond
AC is not as usefull as DC but things like transfourmers cannot run off DC and it is easyer to convert AC to DC so mains power (the power that is supplyed from wall plugs) supplys AC.
AC wich is a problem for us becausThe transfourmer supplys e batterys olny supply DC, and DC it is harder to convert into AC.
Luckley the circuit that was in my speeker had four diodes aranged as a bridge rectifyer. A bridge rectifyers purpose is to convert AC to DC witch is what our batterys supply. This means that what looks like our board draws AC the board its self actually converts it into DC before it reaches anything so we can connect our batterys directley to the input.
Step 6: Preparing the Battery Connecters.
Step 7: Cut the Wire!
I did not have any photos of soldering because my iron blocked up. I will be adding pics when I can solder again.
Step 8: Remove Transfourmer and Power Cables.
Un-screw the transfourmer from the casing then using a pair of plyers squeeze the clip that holds the cable in and then pull out. Cut the power plug off and pull the cable through. You can throw out the transfourmer, keep it for use in other things or convert the speekers back later.
Step 9: Finish! Add Batteys, Reassemble and Test.
Done. Thanks for reading my instructable. I will be uploading more soonish like How To Make A Grass-Kart (go kart).