In this project, you will learn how to build an LED lamp from a metal can, wire hanger, plastic board, wooden plank, and some electronic components.
Step 1: Materials and Tools
3 - 1 watt warm white LEDs
N-channel MOSFET (IRF540) and NPN transistor (2N3904)
1.33 and 100k ohm resistors
26 gauge wires
2 screws and 2 bolts and nuts with washers
12V power supply (9V transformers may give you 12V)
Corrugated plastic board
Wide can with metal base
Sanding tool or tool sharpener
Step 2: Prepare the Lamp Shade
When selecting a can, make sure the bottom is metal so that it heatsink the LEDs and current regulator. The bigger the can, the more wattage it can handle. Feel free to try 3W LEDs. With a 15 cm wide can, the temperature did not exceed 40°C after running the lamp continuously.
Trim the can
The lamp shade requires cutting the bottom portion of the can, leaving two inches of its height. The trimmed edges should be filed and folded with a plier. Do not cut yourself while doing this. It is much safer if you can find a shallow can like a cookie tin so that you can avoid this step.
Mount the LEDs and MOSFET
To mount the LEDs and the MOSFET, apply heatsink paste to the centre and epoxy to the outer edges. Firmly press them onto the flat area of the can and let it set for a few hours before soldering soldering.