Shunt regulator monitors battery voltage - EDN
36V Battery Level Indicator
Low Battery Indicator for 2x AA Batteries - Electrical Engineering Stack Exchange
Uh-Oh Battery Level Indicator Hookup Guide - learn.sparkfun.com
Over voltage protection switch circuit
GitHub - sparkfun/Uh-Oh_Battery_Indicator: Kit that turns on an LED when voltage drops below a settable threshold. Available from SparkFun Electronics.
Workbench Li-ion Battery Charger
Auto cut off 3.7 volt battery charger circuit | TL431 | IRF3205 | Simple Electronics Project - YouTube
DIY Micro 1S Low Voltage Warning | Flite Test
batteries - TL431 low battery cut-off - Electrical Engineering Stack Exchange
Li-ion Battery Charger with TL431
Ode To The TL431, And A LiFePO4 Battery Charger | Hackaday
TL431 circuit Adjustable Shunt (zener) Regulator | ElecCircuit.com
Low Voltage Warning Devices
Lipoly Low Battery Indicator | Battery indicator, Electronics mini projects, Low battery
How to build 3.6 Volt cell phone battery meter - circuit diagram
Low Battery Indicator for 2x AA Batteries - Electrical Engineering Stack Exchange
TL431 Battery Voltage Monitor | REUK.co.uk
Battery discharge indicator on TL431. What is the battery discharge indicator for?
batteries - TL431 low battery cut-off - Electrical Engineering Stack Exchange
Simple Threshold Switch For An LED Indicator
Uh-Oh Battery Level Indicator Hookup Guide - learn.sparkfun.com
Very Simple Low Voltage Battery Alert | All About Circuits
TL431 Overvoltage Protection Circuit, Over Voltage Protection Circuit Diagram
Simple Circuit using LED to alert low voltage - But I need lower threshold | All About Circuits
