• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

Circuits for Beginners | Basic Circuits | LED Driver | Hobby Circuits | Transistor Circuits

New-Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright

Home » Inverter Circuits » How to Charge a Cell Phone from a 1.5V Battery

How to Charge a Cell Phone from a 1.5V Battery

Last Updated on May 17, 2019 by Swagatam 17 Comments

The post explains a very simple charging a cell phone from a 1.5v battery utilizing merely a 1.5V as the input source. The source can be any 1.5V cell rated at minimum 1000 mAH.

Circuit Operation

The circuit description is provided below, let's try to understand the working principle of the proposed cell phone charger circuit using a 1.5V source.

The circuit of a phone charger bears a simple design, with two surface-mount transistors, an inductor, diode, resistor and LED.

However, it should be noted that, one transistor acts as a controller while the other as FET. As the controller gets power from the output (5v) of the circuit, and detecting no-load; the same shuts down.

Moreover it requires very less current. Connecting the 1v5 battery, the controller initiates using less than 1v5 because of the Schottkey diode, charging the 1uF capacitor with the use of FET and flyback effect of the inductor; thus producing high voltage.

With the voltage of output set to 5v, the controller goes in ‘Off’ state, and the only load managed by the 1uF is the controller. As the voltage falls across the capacitor, the controller turns on in bursts, thereby charging the 1uF to 5v.

The method of charging a cell phone from a 1.5v battery is very cheap and can be made at as low as $3, and it also comes with 4 adapter leads.

Submitted By: Dhrubajyoti Biswas

Circuit Diagram

charge cell phone with 1.5V battery

You'll also like:

  • 1.  H-Bridge Inverter Circuit Using 4 N-channel Mosfets
  • 2.  How to Make a Simple 200 VA, Homemade Power Inverter Circuit – Square Wave Concept
  • 3.  3 phase Solar Submersible Pump Inverter Circuit
  • 4.  What’s Islanding in GTI (Grid Tie Inverter)
  • 5.  No Load Detector and Cut-off Circuit for Inverters
  • 6.  Arduino 3 Phase Inverter Circuit with Code

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!

Subscribe for the Latest Posts


 

Reader Interactions

Comments

    Your Comments are too Valuable! But please see that they are related to the above article, and are not off-topic! Cancel reply

    Your email address will not be published. Required fields are marked *

  1. Unknown says

    BBV93 BF245A equivalent

    Reply
  2. Swagatam says

    both are n-channel fets, so it might work

    Reply
  3. Aditya Soni says

    Dear
    Can you give some more detail about inductor for correct purchase?
    Thank you

    Reply
    • Swagatam says

      It has to be hand made, it might not be available in the market.

      Reply
  4. Unknown says

    BBV93 BF245A equivalent

    Reply
    • Swagatam says

      both are n-channel fets, so might work as a replacement

      Reply
  5. won's work says

    Hi Dear swagatham,
    can I use BAT54 Schottkey diode or any other in place of SS14?

    Reply
    • Swagatam says

      Dear Won,

      Actually I have not tested this circuit so not very sure, you can try the part and check how it functions

      Reply
    • won's work says

      OK Dear I'll,thank you very much! I really like your works and your kindness to give an answer for everyone's question!
      Good job…!

      Reply
    • Swagatam says

      The pleasures's all mine:)

      Reply
  6. Sherwin Baptista says

    Hello dear,
    what type of diode is ss14?
    plese help.

    Reply
    • Swagatam says

      hello Sherwin, it's a fast recovery, zero drop type of diode

      Reply
  7. Sherwin Baptista says

    Dear,
    1. Using a duracell, what could be the efficiency of the circuit?
    2. Could i use a toroidal core for the inductor since i have them on hand? Is the inductance value crucial here?
    3. What changes should i make if i use 3v as input supply?
    Thanks.

    Reply
    • Swagatam says

      Dear, the above circuit has not been tested by me, so I can't suggest much about it… I would rather recommend you to try the following circuit instead:

      https://www.homemade-circuits.com/2012/10/1-watt-led-driver-using-joule-thief.html

      Reply
  8. Sherwin Baptista says

    Dear,
    I prepared this circuit after understanding its concept and it worked well, but with some modifications done;
    1. i used 3v as input supply. i also added a 330u 25v cap at input rail.
    2. i made the circuit keeping the 1uf cap temporarily disconnected, i got a no-load voltage of 19v(18.93 on dmm)
    3. i used 2 2n7000 fets parallel in circuit.
    4. i used toroidal inductor with 10t of normal solid wire.
    5. i removed led and resistor, connected to o/p rail.
    6. i used a 10u35v cap at o/p in place of 1u.
    7. i added a zener and resistor network to give 5v.
    now i got 5.13 volts.
    8. finally, i added a 10u35v tantalum and the whole circuit is now complete.
    Thanks, sir for this basic circuit design,
    Your circuits are really helpful.
    Now i can call it my own power bank circuit.

    Regards

    Reply
    • Swagatam says

      Dear Sherwin, that's very impressive, thanks for updating the info….and if it's possible you can send the pics of your circuit for publishing, ….only if it's extremely convenient

      Reply
  9. Unknown says

    HI Can you show bulding this Circuit step by step and with the Pic of the components

    Reply

Primary Sidebar



Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (53)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (98)
  • 741 IC Circuits (19)
  • Amplifiers (58)
  • Arduino Engineering Projects (82)
  • Audio Projects (95)
  • Battery Chargers (82)
  • Car and Motorcycle (94)
  • Datasheets (46)
  • Decorative Lighting (Diwali, Christmas) (33)
  • DIY LED Projects (89)
  • Electronic Components (97)
  • Electronic Devices and Circuit Theory (35)
  • Electronics Tutorial (109)
  • Fish Aquarium (5)
  • Free Energy (35)
  • Fun Projects (11)
  • GSM Projects (9)
  • Health Related (18)
  • Heater Controllers (28)
  • Home Electrical Circuits (101)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (63)
  • Mini Projects (171)
  • Motor Controller (66)
  • MPPT (7)
  • Oscillator Circuits (24)
  • PIR (Passive Infrared) (8)
  • Power Electronics (33)
  • Power Supply Circuits (74)
  • Radio Circuits (9)
  • Remote Control (47)
  • Security and Alarm (61)
  • Sensors and Detectors (116)
  • SG3525 IC (5)
  • Simple Circuits (74)
  • SMPS (29)
  • Solar Controllers (61)
  • Timer and Delay Relay (54)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (40)
  • Ultrasonic Projects (14)
  • Water Level Controller (45)

Circuit Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

Facebook
Twitter
YouTube
Instagram
My Facebook-Page
Quora

© 2022 · Swagatam Innovations

We use cookies on our website to give you the best experience.
Cookie settingsAccept All
Privacy & Cookies Policy

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Please visit the Privacy Policy Page for more info.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Non-necessary
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
SAVE & ACCEPT