Uploaded July 2021 | Updated September 2026, 3 weeks ago
This circuit is a 3.7v Lithium Battery Charge Level Indicator built on a matrix board. A battery level indicator is a device that provides “information about a battery” When the voltage exceeds 3.7v the green LED lights up while if it drops below 3.6v the red LED light up... so when the Lithium-Ion battery is fully charged, the circuit will glow green light and when the Lithium-Ion battery is fully discharged, the circuit will glow red light.
The main component of this circuit is the BC547 transistor, which takes care of flow in its collector only the current necessary to power the LEDs in order to minimize the load on the batteries and obtain a more precise reading. This circuit requires only some low-cost components like transistor, diode, resistors, and LEDs.
I want to clarify that a 3.7 volt lithium battery (nominal value) can be considered charged if, without load, it has a voltage higher than 4 volts, and discharged if it is lower than 3.7 volts.
Components:
1x BC547 NPN Transistor
1x Matrix Board
2x 1KΩ Resistor
1x 220Ω Resistor
2x LED 5mm
1x DC Connector
► PROS and CONS of this circuit:
🟢 PROS: Simple, Functional, Economical, Few components
🔴 CONS: Not for professional use
✅ Subscribe to my YouTube channel It's FREE!
Chapters:
0:00 - Intro & Demonstration
0:40 - Explanation
1:36 - Circuit Diagram
1:40 - END
■▬▬▬▬▬ LINK & Support ▬▬▬▬▬■
✅ YouTube: youtube.com/c/Stefano91ste
✅ Instagram: instagram.com/Stefano91ste
✅ Pinterest: https://www.pinterest.it/Stefano91ste
✅ My STORE: youtube.com/c/Stefano91ste/store
Watch another video =)
● Music Keyboard: youtu.be/ajtR6eDOaQI
● LED Water Level: youtu.be/n9GB0nfwG8s
● Police Light: youtu.be/PtmEqcRbu4w
● Vu-Meter Stereo: youtu.be/l8oUQpGAOCw
● Traffic Light: youtu.be/6iRjZMHVvhs
● Vu-Meter 40 LED: youtu.be/oWB2faToGAA
● Voltage Detector: youtu.be/CxbG7u8kvNk
WARNING: This video is only for demonstration. I don't take any responsibility.
#lithium #diyprojects
This circuit is a 3.7v Lithium Battery Charge Level Indicator built on a matrix board. A battery level indicator is a device that provides “information about a battery” When the voltage exceeds 3.7v the green LED lights up while if it drops below 3.6v the red LED light up... so when the Lithium-Ion battery is fully charged, the circuit will glow green light and when the Lithium-Ion battery is fully discharged, the circuit will glow red light.
The main component of this circuit is the BC547 transistor, which takes care of flow in its collector only the current necessary to power the LEDs in order to minimize the load on the batteries and obtain a more precise reading. This circuit requires only some low-cost components like transistor, diode, resistors, and LEDs.
I want to clarify that a 3.7 volt lithium battery (nominal value) can be considered charged if, without load, it has a voltage higher than 4 volts, and discharged if it is lower than 3.7 volts.
Components:
1x BC547 NPN Transistor
1x Matrix Board
2x 1KΩ Resistor
1x 220Ω Resistor
2x LED 5mm
1x DC Connector
► PROS and CONS of this circuit:
🟢 PROS: Simple, Functional, Economical, Few components
🔴 CONS: Not for professional use
✅ Subscribe to my YouTube channel It's FREE!
Chapters:
0:00 - Intro & Demonstration
0:40 - Explanation
1:36 - Circuit Diagram
1:40 - END
■▬▬▬▬▬ LINK & Support ▬▬▬▬▬■
✅ YouTube: youtube.com/c/Stefano91ste
✅ Instagram: instagram.com/Stefano91ste
✅ Pinterest: https://www.pinterest.it/Stefano91ste
✅ My STORE: youtube.com/c/Stefano91ste/store
Watch another video =)
● Music Keyboard: youtu.be/ajtR6eDOaQI
● LED Water Level: youtu.be/n9GB0nfwG8s
● Police Light: youtu.be/PtmEqcRbu4w
● Vu-Meter Stereo: youtu.be/l8oUQpGAOCw
● Traffic Light: youtu.be/6iRjZMHVvhs
● Vu-Meter 40 LED: youtu.be/oWB2faToGAA
● Voltage Detector: youtu.be/CxbG7u8kvNk
WARNING: This video is only for demonstration. I don't take any responsibility.
#lithium #diyprojects
