The scenario
Designing a portable table fan that operates on a rechargeable 12V battery and alerts the user when the battery voltage drops below a safe threshold.
What is in this drawing
Read the decisions behind it.
01
Use of a diode to isolate charger from battery and prevent reverse current
02
Comparator-based low battery detection with a zener reference voltage
03
SPST switch to manually toggle the fan motor
04
Model fan as a generic resistive load (R_fan) for simplicity
Suitable for DIY electronics enthusiasts building a portable cooling solution or any battery-operated device requiring a low-voltage indicator.
More like this