Here is cheapest LED Night Lamp less than 1 $ using old un used mobile (my lost mobile) charger.
Step 1: Step 1. Materials
1.Old mobile charger (5v 300 ma) - Free existing un used
2.Power LED 1 Watt with heat sink - Rs. 10 (0.16 $)
3.Resistance 10 Ohm 1 watt or higher depends on charger rating - Rs. 1
- Soldering Iron & soldering lead
- Super Glue or any PVC gule
- Screw drive
- pliers, wire cutter
Step 2: Step 2 - Assembling
Solder the LED with Heat sink plate, be care full while soldering these LEDs are very sensitive excess heat may kill LED. Open the mobile charger cover as shown , remove/cut the unwanted wire as shown in Pic. Now solder Resistance on PCB , then solder black wire to -v and white wire to +v .
Step 3: Step 3 - Finishing
After assembling, test it then close the box. Now clean the box, apply little glue between led base and charger box so that LED will fix firm on the box.
Now LED night lamp is ready.