Are you confused on how to give a fresh new life to a broken CFL bulb, read on you’ll get the answer to this question here.
In this post i’m sharing a LED lamp circuit which can be mounted in a broken CFL bulb and can be converted into a LED based power saving light. This is just a LED lamp circuit that can be operated from the mains voltage. A string of five LED is driven using a capacitive transformerless power supply. In the circuit 0.47uF/400V Polyester capacitor C1 reduces the mains voltage. R3 is a bleeder resistor which drains the stored charge from C1 when the AC input is switched OFF. Resistors R1 and R2 limits the inrush of current when the circuit is switched ON. Diodes D1 to D4 forms a bridge rectifier that rectifies the reduced AC voltage and C2 acts as a filter capacitor. Finally Zener diode D5 provides regulation and the LEDs are driven.
Here are some of the pictures of the LED lamp.
Components used :
- 120 Ohm 1/2 Watt resistors 
- 470k Ohm 1/4 Watt resistor 
- 0.47uF, 400 V Polyster capacitor
- IN4007 Diodes 
- 47uF, 25V electrolytic capacitor
- 16-18V 1W Zener diode 
- Hi power LED’s. [ Here i have used 1W circular LED’s ]
The circuit board arrangement which i have built.
After assembling the Circuit board in the CFL bulb casing.
The LED arrangement on a laminate sheet.
The completely assembled, finished LED light.
My smart LED lamp in action.
Another close view of the illuminating LED’s.
1. Carefully remove the broken glass pieces of the CFL bulb.
2. Open the assembly carefully
3. Remove electronics and discard
4. Assemble the circuit in dot matrix PC or on a 1mm laminate sheet.
5. Cut a round laminate sheet with (scissor)
6. Mark the position of the 5 round holes on the sheet
7. Drill the holes to suit the LEDs to flush fit in the six holes
8. Use a dab of adhesive to keep the LED assembly in position
9. Close the assembly
10. Ensure the internal wiring does not touch each other
11. Now test on 230Volt AC Your nice compact table lamp / puja room lamp / passage lamp is ready for use.
For any queries related to this post, ask your questions in the comments section below.