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IPC-2221A says that we should keep clearance for 0.8mm for external layers and 0.25mm for internal layers. image.png Also, we can use a trace of 1mm for average current up to 4A. Temperature rise 45° is not critical overheating. For internal layers, we should use 4x width of trace because JLC intern...

1: image.png Looks like real vr sensor. A transformer is required, which increases cost and complexity. 2: image.png Almost good. A bipolar signal source like MAX232 is required. Diagnostics will not work because VRIN2 is connected to GND. Will there be more problems? 3: image.png Another way is to ...