Below is a list of circuit design tips that I find useful.
Reverse Voltage / Polarity Protection
How to protect circuits from reversed voltage polarity!
https://youtu.be/IrB-FPcv1Dc
Reverse Voltage Protection with a P-channel MOSFET
http://www.instructables.com/id/Reverse-Polarity-Protection-Circuits/
Reverse Polarity Protection Circuits
http://www.instructables.com/id/Reverse-Polarity-Protection-Circuits/
Charge Pump
Providing Continuous Gate Drive Using a Charge Pump
http://www.ti.com/lit/an/slva444/slva444.pdf
Battery Voltage Detection & Current Detection
Hardware Design Considerations for an Electric Bicycle Using a BLDC Motor
http://www.ti.com/lit/an/slva642/slva642.pdf
Optical Isolation
Opto-Isolated Transistor Drivers Microcontroller Interfacing
http://www.bristolwatch.com/ele/opto_isolated.htm
4N25, 4N26, 4N27, 4N28 Datasheet
http://www.vishay.com/docs/83725/4n25.pdf
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