Wednesday, November 21, 2018

AAA Battery Protection with Wrong Polarity LED Indicator

This simple circuit will protect the AA or AAA battery from the wrong polarity connection to your device. If the battery is connected in the 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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General PCB Routing Techniques

For traces that don't need specific impedance or high current, a 10 mil trace width is fine for the vast majority of low-current analog ...