This high power LED flashlight circuit look like a torch by use on 1.5V battery only so it can be used. Since small so Easy to carry in various places. And also very bright as well.
The technical information
Power supply : one 1.5V AA battery.
Maximum current used 200mA
Uses 6 white LED.
Small size PCB.
How it works
As usual, the LED light when a voltage is 1.8V or 2V,
We need a way to increase the voltage to rise, by the switching supply mode in step-up DC to DC converter circuit.
Figure 1 Circuit diagram of High power 6 LED Flashlight for 1.5V AA battery.
As Figure 1 is Circuit diagram of this project. By operation of the circuit is determined by Coil and C2. Which will serve as the production cycle frequency. The LC Frequency circuit with capacitors and capacitor alternately, cause frequency.
When we apply power supply voltage to circuit, the transistor TR1 will working. Then TR2 will work as well. In the meantime, C2 will charge store current. So all LEDs will go out. But when fully charging, TR1 will stop working result C2 discharge to all LEDs glow.
Since the charging and discharging very fast, cause we see them same still brightness. The capacitor-C1 will be filter the current to smooth.
How to builds.
This project is small and a few part so we can use a perforated board. Or use real PCB as Figure 2. Then assemple all parts on PCB and wiring as Figure 3.
Figure 2 the real PCB of this project.
Figure 3 the components layout.
The L1-inductor is 100uH as Figure 4 I measure it show you. And you can use any type that look like it.
Figure 4 Coil is about 100uH.
Figure 5 The High power 6 LED Flashlight projects for 1.5V AA battery.
Testing
When completed circuit assembly Supply voltage range of 1.5V to the circuit.
Then slide the switch to position ON. The All LEDs will lit, the circuit is ready for use.
As Video below.
I want to see wavefrom across LEDs (all in parallel) through an oscilloscope panel.
We will see that high amplitupe about 3Vp-p it cause LEDs glow.
Note: AA battery we should is kind of alkali house. Because high performance
The parts list.
Resistors 0.25watts
R1: 10K
R2: 6.8K
R3: 100 ohms
Electrolytic capacitors
C1: 220uF 16V
Ceramic Capacitors
C2: 680pF 50V
Inductors coil
L1: 100uH Please how to build it here
Transistors
TR1: CS9012__ 0.8A 40V PNP Transistors.
TR2-TR4: CS9013__0.8A 40V NPN Transistors.
PCB, 1.5V AABattery, etc.
Other led flashlight circuits
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Salim Khan
3 Jun 2014Is there any formula to make 100uH inductor?
admin
4 Jun 2014Hi,Salim Khan
Please read here:https://www.eleccircuit.com/how-to-apply-an-inductor-from-the-compact-fluorescent-light-bulb-burned-out/
Salim Khan
4 Jun 2014Thanks for reply sir. The link you give me that I can Modify the toroidal coil.
But In order to make any inductor accurately then formula is needed. If you have please share.
admin
4 Jun 2014Hi,Salim Khan.
I don’t formula for them, but I use L meter measure them.
It is surely value.
Salim Khan
5 Jun 2014Thanks for support.
sk sahabaj
8 Jun 2014hello sir,
how many coli of wire need to make 100uh inductor..i mean how many times i rotate the wire to the coli because i don’t the meter to mesure it..
admin
9 Jun 2014Hi, Sk sahabaj
Okay, Can you have compact fluorescent light bulb?
In any project I use them.
If be toroidal coil I turn wire about 10 times for 100uH at wire 24AWG no.
sk sahabaj
9 Jun 2014i have…
and thanks for the gide sir
admin
9 Jun 2014@sk sahabaj
Never mind, I am pleased to help you.
sk sahabaj
10 Jun 2014the output is 1.5 volt and it is not steping up..
admin
10 Jun 2014@sk sahabaj.
I am sorry to you. Please check all parts and wiring circuits again.
This circuit works.
And voltage output is 1.5V same you read on meter but I look at scope is dc pulse 3Vp-p.
prits
10 Jun 2014Helpful ckt.. I am doing this with a 3.7v rechargable battery.. What modifications should i do.. Pls help
sk sahabaj
10 Jun 2014i wake up in early morning and start doing the circuit from start i made this on a breadbord i made a new inductor with new wire and ferrite core and then recreate the circuit again and NOW THE CIRCUIT WAS WORKING.Yes i have done misstake but now its working now am so happy..
prits
11 Jun 2014Admin pls reply., how to use the ckt with 2 AA cell.pls its urgent
sk sahabaj
11 Jun 2014can you give me a circuit which convert 1.5v to 5v using transistor or ic please.
admin
13 Jun 2014Hi,sk sahabaj
Please see :
https://www.eleccircuit.com/category/dc-converter/step-up-dc-converters/
https://www.eleccircuit.com/step-up-dc-converter-1-2v-to-5v-5v-for-micro-computer/
In the future I will make circuit about them.
admin
13 Jun 2014Hi,prits
Thanks for your feedback.
This circuit not need use 2 x AA battery. because it can use directly to LED which it need 1.8V to 3V for best.
It is made for only one battery.
L Lutvian
13 Jun 2014can i change conductor 100uH with other component..?
admin
14 Jun 2014Hi,L Lutvian.
No,you cannot. But can buy or make it with yourself.
https://www.eleccircuit.com/how-to-apply-an-inductor-from-the-compact-fluorescent-light-bulb-burned-out/
or buy at : https://www.amazon.com/gp/product/B00EZC6F3U/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B00EZC6F3U&linkCode=as2&tag=circuprojeele-20
Sarwar
19 Jun 2014Hi Prits, You may use 2xAA battery in this circuit by connecting them in parallel.
admin
19 Jun 2014Hi, Sarwar.
Thanks for help. Very good Idea. it long time than one battery.
Peter
23 Jun 2014Hello Mr:
i really faced a problem, i am designning one project
useing one 18650 battery to support one resistance, so the resistance would heating
i am try to up the output wattage to 30wattage or 100wattage__the resistence wattage ,
need to converter the output voltage to 10V or 12V ? the output mA current need to converter 5A ?
if you can give some advice or i need to choose some ic ?
Thanks
Paul Baroud
24 Jun 2014Dear sirs, hello,
I am trying to buy components for the high power 6 LED flash light,
and I never have the good part number.
Con somebody send to me the complete board ?
Many thanks, best regards,
Paul Baroud
aot
25 Jun 2014Thanks for your project
Mel Emberga
4 Sep 2014thanks for an interesting project more power!
chayapon
5 Sep 2014Hi,Mel Emberga
Thanks for your feedback.
chayapon
5 Sep 2014Hi,Paul Baroud
Thanks for your feedback.
I am sorry that cannot show you real pcb layout.
But this circuit is small size you can assemble them on the universal pcb board.
For example : https://www.eleccircuit.com/simple-led-torch-using-single-aa-1-5v-battery/
Amooshahrokh
4 Oct 2014Thanks,its amazing.
momename
5 Oct 2014Hi,Amooshahrokh
Thanks for your feedback.
Jonathan
11 Feb 2015Pls sir does It mean that the more transistors u add to the cct the more current or Voltage you get?
mohsen
13 Jan 2016tank you for your site and circuit.
Simon
15 Jan 2016Hi I’ve just finished building 6 led torch +1AA battery on a breadboard . Brilliant circuit I will be soldering this one.
Thanks again for an excellent resource.
Thoson Edimas
18 Oct 2016hi sir,will I get more current at output if I add more transistor (s9013)?
Ramesh
18 Sep 2019Very Fine Circuits and Material. As a non-Electrical/Electronics Candidate i have a simple question of “How to find the Voltage Requirement of a/any load(May be a LED/Fan/Motor etc)”?