This mod has been requested on the AcidMods forum for many months, and as soon as CyberPyrot and FOOfoo had a free moment, they went and bought some IC’s from the local geek store, and sat to brainstorm. Five minutes later they had a working prototype, which only worked with headphones or external speakers, as seen in Grampasmurf’s video on YouTube?. Thinking this would appease the masses, they moved onto other things. Soon, there were many emails asking if we could do this using the internal speakers. So, once again, FOO and Pyrot sat down to work things out, and not long after, the internal setup was invented
This is the full wiring schematic for the PSP Sound-reactive LED mod. NOTE: This schematic doesn’t show actual placement of the components, just their relative position inside the circuit.
Here you can clearly see the pins of the LM386 Audio Amplifier IC. This is the pin layout for any LM386 For this mod pins 1, 7, and 8 are not used.
SUPPLIES NEEDED FOR THE MONO INSTALLATION:30-gauge Kynar wire
2x 0603 LED’s
1x 191k-ohm Resistor
1x 30k-ohm Resistor
1x LM386 Audio Amplifier IC
Hot glue gun
Soldering Iron
Solder
Flux
Advanced soldering and PSP disassembly skills
STEP 1. PREPARE THE LM386 AUDIO AMPLIFIER IC
Start by trimming the pins of the IC, this will ensure the overall size is small enough to fit into the PSP.
Now, trim the leads on the resistors you are using.
Once you have that done, you can solder the resistors to the pins, 1x 30k-ohm Resistor to the #2 “Input –“ pin, and 1x 191k-ohm Resistor to the #3 “Input +” pin.
Next, solder the wires to the IC, 1x length to the #4 “Ground” pin, 1x length to the #6 “Voltage Supply” pin, 1x length to the 30k-ohm Resistor, and 1x length to the 191k-ohm resistor.
Your chip should look something like this.
STEP 2. PREPARE YOUR LED’sThis one's pretty easy. Solder 1x length of wire to the positive side of the LED, and 1x length to the negative side. Mount the LED’s as described by the Trigger mod tutorial, or as you see fit.
STEP 3. ASSEMBLE THE COMPONENTSNow place the chip in its relative position you plan on placing it, don’t put it into the exact position as of yet. Trim wires to length needed. Solder the wires to their respective target locations.
The wire attached to the 30k Ohm Resistor gets soldered to the negative speaker terminal, the 191k-ohm Resistor wire to the positive speaker terminal,
the wire attached to the #4 “Ground” pin to the Mobo ground point, the positive LED wire to the #5 “Output” pin, the wire attached to the #6 “Voltage Supply” pin to the 5v Mobo supply point, and the negative LED wire to the ground point. Now, you can dab a little hot glue onto the chip, to isolate all of the terminals and prevent shorts. Also, it would be wise to wrap the chip with electrical tape of shrink-wrap, <Editor: I use Liquid Electrical Tape, for it’s ease of use, and application. > But anything that will insulate it will work.
STEP 4. SECURE THE CHIP AND TEST IT OUT
This is where we placed our chip; there is just enough space for a perfect fit. Before you put the PSP back together completely, you will probably want to test it, that way you won’t have to tear it all down again if something went wrong.
STEP 5. REASSEMBLE THE PSP AND ENJOYPretty self-explanatory, put it all back together, load up your favorite music and enjoy the show! <Editor: I like the pretty lights… Whoo hoo! > Oh yeah, and let us know how it went, and if you’re still unsure of anything, please visit the AcidMods forum and ask!
Here is the wiring schematic for the stereo installation. As above this schematic only represents the relative position in the circuit of the components and not their actual placement.
SUPPLIES NEEDED FOR THE STEREO INSTALLATION:30-gauge Kynar wire
2x 0603 LED’s
2x 191k-ohm resistors
2x 30k-ohm resistors
2 LM386 Audio Amplifier IC’s
Hot glue gun
Soldering Iron
Solder
Flux
Advanced soldering and PSP disassembly skills
STEP 1. DO IT ALL OVER AGAINThe only difference from the mono installation is you are making 2 chips each with their own resistors, LED’s and separate speaker connections, one left speaker, one right.