This DIY LED Lamp Circuit using Salvaged Parts from Blown LED Bulb is cheap and easy project, as it uses stuff people throw away.
Here, we will learn how to change broken CFL light to energy saving LED light, also this circuit work direct with 230V AC power with no need of transformer to save energy.
Furthermore, it uses capacitive power supply to control current and five bright LEDs light well.
Circuit Working:
Parts List:
| Components | Values | Quantity |
|---|---|---|
| Resistors | 470k 1/4 watt | 1 |
| 120Ω 0.5 watt | 2 | |
| Capacitors | PPC 0.47µF 400V | 1 |
| Electrolytic 47µF 25V | 1 | |
| Semiconductors | 1N4007 Bridge Rectifier | 4 |
| Zener Diode 16V 1W | 1 | |
| LEDs White Straw Hat 5mm 30mA | 5 |
This circuit uses capacitor power supply and then bridge rectifier, smoothing capacitor, Zener diode keep voltage steady and some LEDs for output.
After that, capacitor C1 400V control current main and resistors R2 and R3 protect from sudden current and voltage spikes.
Then resistor R1 discharge capacitor C1 when power is OFF and diodes D1 to D4 in bridge rectifier change AC to pulsating DC.
Also, capacitor C2 smooth DC voltage for steady output and then Zener diode D5 keep voltage safe which is not too high.
Now five bright LEDs need 3V 30mA each in series with 16V output and each LED drop 3V total of 15V for five LEDs.
Therefore, voltage is safe by Zener diode and circuit work good.
Formulas with Calculations:
Current limit by capacitor C1:
Formula:
Xc = 1 / (2πfC)
C1 = 0.47µF and f = 50Hz and Xc = 6770 ohms
Current I = V / Xc
I = 230V / 6770 = 34mA
LED need 30mA so 34mA is good.
Power in resistors R2 and R3 (120 ohm each):
Power = I² × R
P = (0.034)² × 120 = 0.14W
So use 0.5W resistor to be safe.
How to Build:
To build a DIY LED Lamp Circuit using Salvaged Parts from Blown LED Bulb follow below steps for connection:
- First, carefully take out broken glass from frame, it will take time but see no one hurt from sharp parts.
- After glass is out open assembly slowly to see inside parts, be careful do not break more.
- Then take out electronic parts gently an unscrew or unclip to be soft with no damage.
- After that, throw old parts proper way and follow rules for hazardous waste.
- Now build circuit on dot matrix PCB or 1mm thick laminate sheet and if laminate, then cut round piece big enough for circuit.
- Next, plan circuit and mark six holes for LEDs evenly and then drill holes with right size for LEDs and clean rough edges.
- Then put little glue on LED bases and put LED in hole and wait for glue to dry strong.
- Close assembly carefully with no wires touch each other and then use cable ties or clips to keep wires neat.
- Connect to 230V AC power carefully and follow safety rules and watch circuit work and finally, gather parts from circuit diagram and make our own bright lamp.
Conclusion:
To conclude, this DIY LED Lamp Circuit using Salvaged Parts from Blown LED Bulb is simple and smart project to make.
The circuit does not need a large transformer, so it remains small and inexpensive; but it also uses recycled parts, which saves money and helps the environment.
Moreover, the circuit is good to learn AC to DC, LED driver and capacitor power supply basics.