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Rechargeable LED Lantern Circuit Using Dynamo

Last Updated on September 20, 2020 by Swagatam 17 Comments

caution electricity can be dangerous

In this post we study a simple rechargeable LED lantern circuit which features battery charging option from a dynamo as well as from a mains 220V source. The idea was requested by Mr. Chidimonday.

Technical Specifications

I like what you doing here, i have even put in work some of your circuit and it functioned well, please sir can you help me, am writing from Nigeria, please i need a circuit diagram of 9v rechargeable lantern using dynamo and also electric current, thanks,i will be grateful if you respond back immediately, you can, send it through my Gmail account (chidimonday@gmail.com)

LED Lamp Circuit charged using  Dynamo

The Design

The simple diagram presented above explains how a 9V battery may be charged from a dynamo and also from an external 12V DC source simultaneously or separately, and subsequently used for powering an LED lantern.

The opamp IC along with the shown associated component basically forms a shunt regulator stage, which regulates the dynamo voltage and current by shorting its power to ground whenever it tries to exceed the 12V mark.

The controlled 12V is allowed to pass to the connected 9V battery for charging via a LM317 current limiter stage.

The DC acquired from an external source such as from an AC/DC wall adapter can be also seen fed at the input of the LM317 regulator, which is further  appropriately trimmed down by the LM317 stage in order to enable a safe charging for the connected battery,

The value of Rx can be calculated as per the information provided in the following article:

Universal current limiter circuit for high watt LEDs

Parts list for the proposed LED lantern circuit using a dynamo and mains AC

R1, R2, R3 = 10k
R4 = 6.4K
Z1, Z2 = 4.7V zener diode
T1 = TIP122
IC1 = 741
D1, D2, D3 = 1N4007
C1 = 100uF/25V

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Have Questions? Please Comment below to Solve your Queries! Comments must be Related to the above Topic!!

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