Step 1: Car to portable MP3 player power supply
Open up your lamp and look for a small ferrite core transformer (some brands might have two, so try different brands or sizes)
Step 2: MP3 PSU:Stuff you'll need
-NE 555 (Timmer- oscillator IC)
-two 1N4001 or 1N4148 diodes or any similar (for low frequency)
-10k trimpot or potencimeter
-100n ceramic or polyester capacitor
-10n ceramic or polyester capacitor
-1000u X 25 V polarized capacitor
-Any N-Channel enhanced mode Mosfet for 5 A or greater current
-470 Ohm resistor
-A Schotsky diode (This is the most important item, since is should be a diode that can switch at high frequencies, thus the "fast recovery" tag) I got this from a deceased laptop power adaptor. They are very common.
-FROM YOUR LAMP, remove the xtransformed and if it is is still in goog shape, use it. If not, you can still use the core and rewind some 200 turns of magnet wire (30 or 32 AWG). Inductance of this coil should be in the mH range.