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How to Make a Simple LED Bulb Circuit

LED lights are become very popular these days.

People also call them LED bulbs or solid state lights.

These lights use very less power like only 0.5 to 3 watts so they save lot of electricity bill.

Before 10 years these bulbs were not so bright.

But still we can make our own easy LED bulb with this guide..

We can show How to Make a Simple LED Bulb Circuit in different colors and also talk about good things of using them.

What is a LED Bulb Circuit:

LED bulb circuit is electric setup that give power to LED bulb and control it.

LED lights uses small chip like semiconductor to make light.

They save more energy than old bulbs like incandescent or tube light.

Inside LED bulb parts change electricity into light and control the current and also do extra things like change color or make light dim.

Circuit Working:

Parts List:

CategoryComponentQuantity
Resistors1M 1/4 W2
100Ω 1W 3
CapacitorsPPC 0.33µF 400V2
Electrolytic 47µF 100V1
SemiconductorsDiode 1N40078
LEDs 30mA 5mm9

Every year LED become more powerful and more bright because technology improve fast.

White LED is popular for many uses and it give different color of light from warm like old bulb to very white like sunlight from 2700 to 10,000k.

We can choose LED by place and type like diffused LED.

Also it have different beam angle from 10° to 150°.

When technology grows LED price goes down but brightness and efficiency goes up.

Online tool also there to help change brightness into light flowing easily.

Power Supply:

Good power source is needed when using LED bulb with main electricity.

Transformer is not good for small size and low power so people use capacitor based power supply.

Best is class X2 capacitor with 250V AC which helps to reduce high current at start.

Also it uses series resistor between 220Ω to 2.2kΩ.

When power turn OFF one parallel safety resistor around 1M ohm checks capacitor loses charge.

Small bridge diode change AC to DC low voltage.

For normal 5mm LED to online tool can help us find right part values for making LED bulb.

Formulas and Calculations:

Now we show some simple formulas to calculate current for easy LED bulb circuit.

We used capacitor 0.33uF and check how much current come out for 50Hz and 60Hz mains power.

Capacitance (C): 0.33 microFarad (uF) = 0.33 × 10⁻⁶ Farad (F)

Formula:

Xc = 1 / (2 × π × f × C)

where:

Calculation:

For 50Hz:

Xc_50Hz = 1 / (2 × π × 50 × 0.33 × 10⁻⁶)

Xc_50Hz = 9.55k ohm

For 60Hz:

Xc_60Hz = 1 / (2 × π × 60 × 0.33 × 10⁻⁶)

Xc_60Hz = 7.96k ohm

Now we find the current using this formula:

I = Vin / Xc

where:

Important:

This is just rough math and it does not count all things in real circuit.

Also never test mains voltage yourself it can be dangerous.

Estimated current:

For 50Hz:

If 120V → I = 120 / 9550 ≈ 12.6 mA

If 230V → I = 230 / 9550 ≈ 24 mA

For 60Hz:

If 120V → I = 120 / 7960 ≈ 15.1 mA

If 230V → I = 230 / 7960 ≈ 29 mA

Note:

These are just guess numbers.

Real current can be lower because of power loss, part quality or safety reasons.

Also this 0.33uF capacitor may not give enough current for many LEDs.

How to Build:

How to Make a Simple LED Bulb Circuit the following steps are needed to be followed:

Choosing an LED:

Power Supply Design:

Resistor Calculation:

Safety Tips:

Correction:

LED Connection:

Making the Circuit:

Safety Precautions:

Note:

Real values can change because different parts give different result and this is just simple guide.

Always check if parts which we use are safe and follow safety rules.

If anyone is not sure about electronics ask someone who knows better.

Electric work is risky so always stay safe at every step.

References:

LED lamp

LED-Lamp Design for Renewable Energy

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