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Battery indicators

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Alarm light circuit for battery charger
Posted inBattery Chargers

Battery full charge alarm circuit

The Battery full charge alarm circuit for a general battery charger. It is simplified circuit and cheap, use one transistor BC557 and display with 2 LED.
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Battery low voltage alarm indicator circuits
Posted inMeters & Detectors

8 Low Battery Voltage Alarm indicator circuits

Why your circuit does not work? Because the battery is run out. These low voltage indicator circuits may helpful for you. If you can know before and change a new one right now. It makes you not have to waste time when using those projects.
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