Wednesday, November 21, 2018

AAA Battery Protection with Wrong Polarity LED Indicator

This simple circuit will protect AA or AAA battery from wrong polarity connection to your device. If the battery is connected in opposite way, D1 will conduct and PTC Fuse will break the circuit. Wrong polarity indicator, LED 1 will be turned on at the same time.

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Ultra-Precise, Current-Sense Amplifier

   This ultra-precise current sense amplifier that can measure voltage drops across shunt resistor, R1 over a wide common mode range from 2....