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Test #1 - 1381E only
Test #2 - 1381E powering BBC microbit directly
Test #3 - 1381E controlling 2N3904, which powers BBC microbit
Test #4 - Power supply feeding 1F supercap, powering the circuit
Test #5 - Power supply feeding 3F supercap, powering the circuit
Test #6 - Power supply feeding 10F supercap, powering the circuit
1381E threshold characterization