Site icon Circuit Ideas for You

DIY LED Lamp Circuit using Salvaged Parts from Blown LED Bulb

This DIY LED Lamp Circuit using Salvaged Parts from Blown LED Bulb is cheap and easy project.

It uses stuff people throw away.

Here we will learn how to change broken CFL light to energy saving LED light.

This circuit work direct with 230V AC power with no need of transformer to save energy.

It uses capacitive power supply to control current.

Five bright LEDs light well.

Circuit Working:

Parts List:

Component TypeValue/SpecificationQuantity
Resistors470k 1/4 watt1
120Ω 1/2 watt2
CapacitorsPPC 0.47µF 400V1
Electrolytic 47µF 25V1
Semiconductors1N4007 Bridge Rectifier4
Zener Diode 16V 1W1
LEDs White Straw Hat 5mm 30mA5

This circuit uses capacitor power supply.

Then bridge rectifier, smoothing capacitor, Zener diode keep voltage steady and some LEDs for output.

Capacitor C1 400V control current main.

Resistors R2 and R3 protect from sudden current and voltage spikes.

Resistor R1 discharge capacitor C1 when power is OFF.

Diodes D1 to D4 in bridge rectifier change AC to pulsating DC.

Capacitor C2 smooth DC voltage for steady output.

Zener diode D5 keep voltage safe which is not too high.

Five bright LEDs need 3V 30mA each in series with 16V output.

Each LED drop 3V total of 15V for five LEDs.

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

Use 0.5W resistor to be safe.

How to Build:

To build a DIY LED Lamp Circuit using Salvaged Parts from Blown LED Bulb following steps need to be followed while assembling and connections:

Conclusion:

This DIY LED Lamp Circuit using Salvaged Parts from Blown LED Bulb is simple and smart project to make.

With no big transformer needed, so its small and cheap.

It is used in recycled parts save money and help environment.

Circuit is good to learn AC to DC, LED driv, and capacitor power supply basics.

References:

5mm Straw hat LED Lamp

Exit mobile version