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This was my initial method of installing a transistor in a PSP.  It is still a useful method but in this instance seems to be un-necessary
Back to Lighted PSP Tutorial

To wire our LED's so they will turn on with the power LED turning on we used a PNP transistor.  PN2907 is readily available at Radio Shack.  A transistor is basically a solid state relay which is just what we needed.  Since Sony didn't leave us with any obvious sources of power to supply our LED's we are going straight to the source, tapping it from the battery.  This means if we don't have some type of switch to toggle power on and off the lights would stay on even when the PSP goes to sleep.  (Thanks to poopyhead852000 for re-doing the drawing with proper symbols etc)
020106 054.jpg (32536 bytes) To power the LED's we tapped direct to the battery input, this was a bit harder than expected, it seems the solder used to create the PSP doesn't want to combine with my normal 60/40 solder so it took a bit of fooling around to get everything to make a proper connection.  I suspect this is due to the new no lead regulations in home electronics, I may be on the lookout for some new solder.
I bread boarded out the circuit first so I could see what worked and what didn't.  It turned out that the status LED's have power going to them all the time (even when the PSP is off) when it is turned on they are provided with ground and the circuit is completed and the corresponding green or orange LED turns on.  We get power from the battery, go from that into a 10ohm resistor, that into all the positive legs of the 0603 LED's, all negative legs into the collector of the transistor, the transistor middle leg to one of the points in the photo below, the emitter to ground.  I wired ground to the battery but next time I will tap to ground somewhere closer and run one less wire.
(note there are extra components on this breadboard just for storage, two transistors and one resistor are not used in the actual circuit, the two large solid core green wires supply ground and trigger for the transistor, there is also a resistor on the output of the transistor all positive legs are soldered to that)
020106 062.jpg (41595 bytes) I recommend soldering to the via's.  Once cleaned they soldered easily I suspect the resistors will have the funky solder and be difficult to work with.

 
Thanks Sony!  Look at this huge compartment they left us to work with.  I think I will go with smt transistors in the future but it was enough space to work with.
In this photo you can see some odd soldering, not my best work but hey got er done.  The Leg on the left in the photo is connects to ground on the battery and buts against the steel holding the LCD in place which is also ground so put those toward each other and there's one less place to short out.  Of course middle pin to one of the points pictured above.
We then sandwich the resistor in electrical tape to help resist shorts, lay er on top and test it out!
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Sony, PlayStation, and the Playstation logos are registered trademarks or trademarks of Sony Corp.  Llamma.com is in no way affiliated with Sony.  All references to Modchips, Linux and any other forms of modifications are done for the purpose of writing and testing interoperable software as allowed under Sect. 1201 (f) Reverse Engineering exception of the DMCA.  This site does not condone the illegal copying of games.  All advice/information is provided as is without warranty to accuracy. Do not consider any comments as legal advice, I am not a lawyer. All references to Mod chips should be taken as hypothetical in nature, actually installing a mod chip may be illegal. In simple terms don't sue me if you mess up on your own or with my help. Make your own decisions do the research determine what is legal and what is not, I take no responsibility for your actions.  
All photos and content copyright © Llamma Corp. 2002
-2006

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