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How to Make a Simple 12 Volt LED Lantern Circuit

Last Updated on January 2, 2024 by Swagatam 37 Comments

In this post I have explained how to build a simple 12V LED lantern circuit which may be used at night while travelling and outings such as in picnics, trekking, or camping etc.

Table of Contents
  • Introduction
  • How it Works
  • Circuit Diagram for the LED Lantern

Introduction

So far we have discussed white LEDs comprehensively through many of my earlier articles and have learned how efficient these lights are with power consumption.

In this article we will study a very simple configuration for making a LED lamp or a LED lantern.

New electronic enthusiasts often get confused with the wiring intricacies while configuring many LEDs in groups.

Here we’ll see how we can connect as many as 64 LEDs for making the proposed unit.

How it Works

The circuit diagram details may be understood from the following points:

White LEDs typically have a forward voltage drop of about 3 volts.

When operated at the above voltage level, the device is able to produce lights at optimum levels and the spec also maintains better life expectancy.

The minimum current required at the above voltage level is around 20 mA, which again is an optimal magnitude and is ideally suited for a white LED.

That means for driving a single white LED in the most straightforward way we would require 3 * 0.02 = 0.06 watts, that’s pretty negligible compared to the relative illumination received from it.

The best thing is that as long as the above voltage and current spec is observed, the device continues to consume 0.06 watts irrespective of the number of LEDs connected.

In the present circuit, the maximum voltage available is 12, dividing 12 by 3 = 4, meaning 4 numbers of LEDs can be accommodated at this voltage and yet we are able to limit the power to 0.06 watts.

However the above calculation would make the circuit quite vulnerable to voltage drops and if the voltage dropped even by a single volt would make the LED too dim or might just shut them OFF, we don’t want this to happen.

Therefore though the efficiency may drop a bit, we opt for a configuration which would enable the circuit to work even at lower voltages. We include only two LEDs in the series @ o.06 watts.

Now it’s all about connecting the desired number of strings of two LEDs each in parallel until all the 64 bulbs are included in the circuit.

However connecting in parallel would mean multiplying current. Since we have 32 parallel connections means the total consumption will now become 32 * 0.06 = 1.92 watts, still pretty much reasonable.

 

Circuit Diagram for the LED Lantern

The connection details can be easily traced from the given schematic.

Your simple LED lantern is ready and may be taken anywhere outdoors with you, probably during night time explorations.

 

Pats List

All resistors are = 470 Ohms, 1.4 watts,

All LEDs are = white, 5mm, hi-efficiency

Diode = 1N4007

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Filed Under: Lamps and Lights Tagged With: Lantern, LED, Simple, Volt

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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