Bukit Mertajam, Penang

Rechargeable LED Torch

Rechargeable LED Torch is a DIY pocket size LED torch light using single AA rechargeable battery, super bright white LED and rechargeable using standard USB port. This is a great DIY project where you can learn about voltage booster and USB charger for AA rechargeable battery.

 

Step by step guide

First of all, you have to gather all the components required.

Component list:

  1. 1 x 3.9K Ohm 1/4W resistor
  2. 1 x 10 Ohm 1/4W resistor
  3. 1 x 1.5K Ohm 1/4W resistor
  4. 1 x 470 Ohm 1/4W resistor
  5. 1 x 6.8K Ohm 1/4W resistor
  6. 1 x 10K Ohm 1/4W resistor
  7. 1 x 100K Ohm 1/4W resistor
  8. 1 x 150pF Ceramic capacitor
  9. 1 x 16V 100uF Electrolyte capacitor
  10. 1 x 1N5819 diode
  11. 1 x USB-Type B female connector
  12. 1 x 5mm super bright white LED
  13. 1 x 3mm red LED
  14. 1 x 22uH inductor
  15. 1 x BC557 PNP transistor
  16. 1 x 2N2222 NPN transistor
  17. 1 x Single Pole Double Throw slide switch
  18. 1 x Push button
  19. 1 x LM358 IC
  20. 1 x AA rechargeable battery
  21. 1 x 7cm x 3cm donut board

Normal electronic store doesn’t sell 7cm x 3cm donut board, so, maybe you have to cut the donut board from a larger donut board.

Divide the donut board into 3 parts: battery, charger, and LED.

Start by soldering the USB Charger circuit. You may need to drill a 2mm hole at the donut board to insert the USB B-type connector.

Place the USB B-type at the end of the board so that it is easier to plug in the USB cable to charge the torch. Also try to organize the board, like how much spaces will the battery take, slide switch, and also components.

To reduce the size of the board, you may try to put the resistor at “standing” position.

Finish doing the charging circuit.

Continue with the voltage booster circuit.

Complete the circuit, and use double sided tape to hold the battery to the donut board.

Place the battery to the donut board and solder wires to the positive and negative terminal of the battery.

Switch to charging operating mode, and connect to USB cable to charge the battery. Make sure the charging red LED is turned on.

After finish charging, switch the slide switch back to normal operating mode, and have fun!


 

Circuit description

The description of the circuit will be divided into 2 parts, USB charger and voltage booster.

USB Charger

The USB AA battery charger is basically constructed by 2 main blocks, one is the comparator, and another one is the transistor charging circuitry. LM358 consist of 2 voltage comparator and its design to operate from a single supply.

In the charger circuit, we use comparator to compare the voltage of the battery with a fixed voltage from 3 resistor voltage divider. Once the battery is fully charge, the comparator will turn off the charging circuit.

R1, R4 and R6 are voltage divider and the output voltage of the nod A and nod B can be calculate by following equation:

These Va and Vb will be connect to the negative input of the comparator 1 and comparator 2 which will be compared with the voltage of the battery. Once the voltage of the battery reach 1.386V, the Out 2 will equal to one, and the red led will be turned off. Once the voltage of the battery reach 1.396V, the Out 1 will equal to one, and the transistor charging circuitry will be turned off.

The transistor charging circuitry is mainly build by a PNP transistor, BC557 which will be turn on when Out 1 equal to zero. The typical charging current for the setup is around 80mA.

Voltage Booster

The voltage booster is basically a boost converter where the output voltage can be greater than the input voltage. Since the super bright white LED needs around 3V to operate and the output of rechargeable AA battery is only 1.2V, then this boost converter is suitable for our application.

In general, a boost converter consists of an inductor, a switching circuit and a capacitor storing circuit. When the switching circuit turns on the inductor, the current flow through the inductor will increase. After a certain period, the switching circuit will turn off the inductor. As we know the current flowing in an inductor must be continuous, and at this time, the current is being force through the diode into the storing capacitor.

Overall Circuit

 

 

To separate the charging and booster circuit, the battery is being connect to a slide switch where it determines the operating mode, either charging or normal operation.

Related Posts

Comments (189)

Hi,
May I know what is the function of inductor in your voltage booster circuit?

Ehhh … actually i cant see a thing … the circuit nor the picture that you post …

Great idea, I like it

can i boost the voltage capacity of my rechargeable battery using this circuit?

can we charge 9V Battery using this circuit?

i’ve tried soldering the whole circuit…the recharge works but the voltage booster doesn’t really boost… is it because of the inductor? help needed

Nice job man. I understand

[…] is a DIY pocket size light using single AA battery, super bright white and using standard port. […]

[…] is a DIY pocket light using single AA battery, super bright white and using standard USB port. This… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA , super bright white and using standard USB port. This i… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, super bright white and… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, super bright white and… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard port. […]

[…] Rechargeable is a DIY pocket size light using AA rechargeable battery, super bright white and rechar… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] LED is a DIY pocket size LED light using single AA , super bright white LED and using standard USB … […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] 59 thoughts on “ LED ”. Phang says: December 2, 2008 at 3:08 pm. […]

[…] 59 thoughts on “ LED ”. Phang says: December 2, 2008 at 3:08 pm. […]

[…] 59 thoughts on “ LED ”. Phang says: December 2, 2008 at 3:08 pm. […]

[…] LED is a DIY pocket size LED light using single AA battery, super bright white LED and using standa… […]

[…] is a pocket size light using single AA battery, super bright white and using standard USB port. Thi… […]

[…] 59 thoughts on “ LED ”. Phang says: December 2, 2008 at 3:08 pm. […]

[…] LED is a DIY pocket size LED light using single AA battery, super bright white LED and using standa… […]

[…] LED is a DIY pocket size LED light using single AA battery, super bright white LED and using standa… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] LED is a DIY pocket size LED light using single AA battery, super bright white LED and using standa… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using […]

[…] LED is a DIY pocket size LED light using single AA battery, super bright white LED and using standa… […]

[…] LED is a DIY pocket size LED light using single AA battery, super bright white LED and using standa… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable , bright white and rechargeable… […]

[…] LED is a DIY pocket size LED using single AA battery, super bright white LED and using standard USB… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, bright white and recha… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] LED is a DIY pocket size LED light using single AA , super bright white LED and using standard USB … […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, bright white and recha… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, bright white and recha… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, bright white and recha… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, bright white and recha… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, bright white and recha… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, bright white and recha… […]

[…] Rechargeable is a pocket size using single AA rechargeable battery, super bright white and rechargea… […]

[…] wholesale usb charge led – felt with the heart. […]

[…] LED is a DIY pocket size LED using single AA battery, super white LED and using standard USB port. … […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable battery, white and rechargeable… […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable , super bright white and rechar… […]

[…] Rechargeable LED is a DIY pocket size LED using single AA rechargeable battery, super white LED and … […]

[…] Rechargeable is a DIY pocket size light using single AA rechargeable , super bright white and rechar… […]

[…] Rechargeable LED is a DIY pocket size LED using single AA rechargeable battery, super white LED and … […]

[…] LED is a DIY pocket size LED light using single AA battery, super bright white LED and using standa… […]

[…] rechargeable – Wishing to be friends is quick work. […]

[…] Rechargeable LED is a DIY pocket size LED using single AA rechargeable battery, super white LED and … […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard port. Thi… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port.… […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size light using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. This … […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. This is a … […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] Rechargeable LED Torch – Tutorial by Cytron […]

[…] dice, one of the interesting project using except from blinking. In here, we going to experience on… […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] Rechargeable is a DIY pocket size using single AA rechargeable battery, super bright white and recha… […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] dice, one of the interesting project using except from blinking. In here, we going to experience on… […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] inches size – Many ants kill the horse. June 1, 2018 at 7:34 am. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] Rechargeable is a DIY pocket using single AA rechargeable battery, super bright white and rechargeab… […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] Introduction Good day, As we all know, an Cube is a bunch of that arranged in a cube shape that can … […]

[…] is a DIY pocket using single AA battery, super bright white and using standard USB port. […]

[…] wholesale usb charge torch – felt with the heart. […]

[…] custom – strength and thought. March 9, 2018 at 5:26 am. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size single AA battery, super bright white and standard USB port. […]

[…] is a DIY pocket size single AA battery, super bright white and standard USB port. […]

[…] dice, one of the interesting project using except from blinking. In here, we going to experience on… […]

[…] – Many ants kill the horse. May 28, 2018 at 1:31 pm. […]

[…] size – Many ants kill the horse. May 21, 2018 at 5:32 pm. […]

[…] cm – Many ants kill the horse. May 28, 2018 at 1:31 pm. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] Hi everyone, did you watch our Selamat Hari Raya Aidilfitri 2015 ? In that I use Cytron RainbowBit t… […]

[…] length – Many ants kill the horse. May 28, 2018 at 1:31 pm. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] When the analog distance sensor detect the object nearer, more RainbowBit will up and when the dista… […]

[…] warranty – Many ants kill the horse. June 5, 2018 at 7:32 pm. […]

[…] The of the RainbowBit that up is controlled by the analog distance sensor. […]

[…] on – Many ants kill the horse. June 3, 2018 at 5:31 am. […]

[…] near me – Many ants kill the horse. May 20, 2018 at 3:31 pm. […]

[…] Hi everyone, did you watch our Selamat Hari Raya Aidilfitri 2015 ? In that I use Cytron RainbowBit t… […]

[…] warranty – Many ants kill the horse. June 5, 2018 at 7:32 pm. […]

[…] In that I use Cytron RainbowBit to make the colourful plate. The number of the RainbowBit that up is… […]

[…] open – Many ants kill the horse. June 6, 2018 at 1:30 am. […]

[…] When the analog distance sensor detect the object nearer, more RainbowBit will up and when the dista… […]

[…] warranty – Many ants kill the horse. June 5, 2018 at 7:32 pm. […]

[…] near me – Many ants kill the horse. May 20, 2018 at 3:31 pm. […]

[…] open – Many ants kill the horse. June 6, 2018 at 1:30 am. […]

[…] is a DIY pocket size using single AA battery, super bright white and using standard USB port. […]

[…] Rechargeable is a DIY pocket using single AA rechargeable battery, super bright white and rechargeab… […]

[…] size in – Many ants kill the horse. June 6, 2018 at 9:32 pm. […]

[…] open box – Many ants kill the horse. June 6, 2018 at 1:30 am. […]

Leave a comment

Get 7 Tips for Developing Electronic Projects
We respect your privacy.
Loading...