- Electronics Projects
- 1.5v to 220v AC simple inverter
- Build Simple AM Radio receiver at home
- Simple Uninterruptible Power Supply (UPS) Circuits
- Single Transistor Amplifier Circuit
- 3.7v Lithium Battery Level Indicator
- LED Chaser using transistors
- Electronics Projects for Beginners
- Simple Latch Circuit Using Transistors
- DC to AC Power Converter circuit feature working
- Fire Alarm Circuit using Transistor
- Two Transistor Amplifier
- Laser Security System
- Music Operating Dancing LEDs light
- Volts Booster Circuit Using Ferrite ore transformer
- Touch switch circuit using Transistor
- Two transistor FM transmitter project
- LED Flasher Using Timer IC 555
- DC Voltage Power Supply Using The LM317
- Electronic Mosquito Repellent Circuit
- Light Dimmer Circuit 1000 Watts Using BT139
- Non-Contact Voltage Detector by using transistor
- 4 volts simple inverter project: explanation
- Flashing Police Lights Circuit
- Light Dependent Resistor, its types and applications
- 100 watts inverter circuit working and applications
- Stereo Audio Amplifier 5W Circuit using TEA 2025 IC
- Small High Volts using 2Sc 1815 transistor
- Electronic Doorbell Circuit using a 555 and CD4017
- Touch On Touch Off Switch Circuit Using 555 timer
- LM386 Audio Amplifier Circuit
- IC 4440 Amplifier Circuit
- Neon Lamp Circuits Working and Application
- Low Power Audio Amplifier Using integrated circuit
- Voltage Regulator Circuits using Transistor and Zener Diode
- Water Level Indicator Circuit Using Transistor
- LED Chaser using CD4017 IC
- Motion Sensor Light Switch
- Melody Generator Using IC um66
- Water Level Indicator Using IC
- Led Light to 220v AC
- LiFi Data Transfer System, WiFi vs LiFi
- How to Connect a CAR Battery | Polarity Checker
- Voltage Level Indicator Circuit
- Security Alarm Using PIR Sensor
- Battery Level Indicator Using LM 3914
- Single Transistor FM Transmitter circuit
- Different types of Capacitor
- Light Emitting Diode (LED) Types of LEDs
- Different Types of Relays
- Piezo buzzer features equivalent
- Clap Switch : Circuit and Its Working
- Different Types of diode, working and features
- PC817 Optocoupler Pinout, Equivalent, Features and applications
3.7v Lithium Battery Level Indicator
This simple project is about a 3.7v Lithium Battery Level Indicator, we are going to make a very simple battery level indicator. This indicator circuit is for a 3.7 volts indicator. We have designed this circuit with a few components at home with easily available components. These components can either be collected from an old circuit or can be purchased from an electronics shop easily.
Circuit Diagram 3.7v Lithium Battery Level Indicator
Components required 3.7v Lithium Battery Level Indicator
A list of required parts that are needed to build a lithium battery level indicator is given below
- Transistor – BC547 x1
- Resistor – 1K x2
- Resistor – 220 ohms x3
- PN-Junction Diode – 1N4007 x1
- LED – 3V x2 (Red for Low charge indication and Green for Full charge indication)
- Battery – 3.7V and 3V
First, connect the 1K resistor to the Base and emitter pin of the transistor as shown in the picture given below.
In the second stop solder the 220-ohm resistor to the collector pin of the transistor as shown in the picture.
In this step Connect a 1 kilo-ohm resistor with the second point of the 220-ohm resistor.
In step 4 connect Diode IN4007 with the base point of the Transistor as we have connected in the picture given below. Connect the cathode point of the diode with the base point of the transistor.
Connect – point of green led with Diode – point and +ve point of LED green led with 1k resistor as shown below.
Solder – point of red LED to -ve point of the diode and + point of red LED with collector point of the transistor as we have shown in the diagram given below.
3.7v Lithium Battery Level Indicator Testing
Our circuit has been completed Now we check it by connecting the battery. Connect +ve of 3.7 Volts battery to +ve point of green LED and – point of 3.7V battery to emitter point of the transistor as we have connected in the circuit given below.
When you will connect the 3 V battery the Red LED will glow completely if the battery will be low. Green Led glows when the battery will be charged above 3.2V.
Its tested Circuit and its complete construction points can be seen in the video given below.