Help w/ low battery indicator please

  • Thread starter Thread starter KSM74
  • Start date Start date
  • Tags Tags
    Battery
Click For Summary
SUMMARY

The discussion focuses on creating a low battery indicator for an 11.1V battery system that activates a red LED when the voltage falls below 7V. Participants recommend using components such as operational amplifiers (op-amps) and zener diodes, specifically referencing the LM741 op-amp as a potential solution. Additionally, battery monitoring integrated circuits (ICs) from manufacturers like Maxim are suggested for more precise voltage monitoring. The user expresses a need for guidance on the necessary components and calculations to set the voltage threshold accurately.

PREREQUISITES
  • Understanding of basic electrical circuits
  • Familiarity with operational amplifiers (op-amps)
  • Knowledge of zener diodes and their applications
  • Basic skills in voltage measurement and threshold setting
NEXT STEPS
  • Research battery monitoring ICs from Maxim and similar manufacturers
  • Learn how to calculate voltage thresholds using op-amps
  • Explore circuit design for low battery indicators
  • Investigate alternative components for LED activation in low voltage scenarios
USEFUL FOR

Electronics hobbyists, circuit designers, and anyone interested in building low battery indicators for battery-operated devices.

KSM74
Messages
3
Reaction score
0
Any help is appreciated,

I have a 11.1v battery system, an I would like to install a low battery indicator. I would like the indicator to be a single red LED that initiates when the voltage drops below 7v. Size is definitely a concern here.

I have looked online at various templates, but I just can't find what I am looking for. I admittedly only know enough about electrical circuits to get myself in trouble. I suppose the main question is; what type of components should I use? I'm not sure I know how to do the math to get the threshold set at 7v.
 
Engineering news on Phys.org

Similar threads

"Magic" AA batteries in a home device?
  • · Replies 15 ·
Replies
15
Views
3K
Increasing the Battery Life of an LED Circuit
  • · Replies 26 ·
Replies
26
Views
5K
How to make a custom UPS using an old PC power supply and 18650 batteries?
  • · Replies 7 ·
Replies
7
Views
4K
Simple circuit for Battery Status indication for 7.4v re-chargable bat
  • · Replies 2 ·
Replies
2
Views
2K
Battery energy efficiency and Coulombic efficiency - what are they?
  • · Replies 2 ·
Replies
2
Views
2K
Why do e.g. smoke detectors need specific battery models?
  • · Replies 20 ·
Replies
20
Views
14K
Safe to charge a Lithium Battery with a Voltage Limit?
  • · Replies 2 ·
Replies
2
Views
2K
Questions about batteries and magnets and EM induction
  • · Replies 4 ·
Replies
4
Views
2K
Using this power level indicator to measure a power supply voltage
  • · Replies 1 ·
Replies
1
Views
2K
Electric Gauntlet for Phone, Flashlight & Laser Pointer: Battery Selection Guide
  • · Replies 18 ·
Replies
18
Views
2K