Pi seconds are a nano-century. (pi ~ 3600 * 24 * 365 * 100 * 1e-9)
Maximum current on PCB trace: 500mA per 10mil 1oz trace.
PCB 1oz resistance: 0.5mOhm per square
Parallel resistance: R1 || R2 ~ R1 (1 - R1/R2), R1 << R2
Quadratic equation:
Divider tolerance:
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