ELECTRONICS
12V Rechargeable Fan with Battery Low Indicator
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CASE ANALYSIS
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.
Key decisions
- Use of a diode to isolate charger from battery and prevent reverse current
- Comparator-based low battery detection with a zener reference voltage
- SPST switch to manually toggle the fan motor
- Model fan as a generic resistive load (R_fan) for simplicity
When to reuse this
Suitable for DIY electronics enthusiasts building a portable cooling solution or any battery-operated device requiring a low-voltage indicator.
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circuit-12v-rechargeable-fan-with-battery-low-indicator