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yellow green design white pattern zener diodes electronic circuit board semiconductor components silicon-diode technology diode semiconductor zener-diode integratd-circuit circuit-board link parallel anode cathode background electronics voltage inverted dc ac polarity quantum-tunnelling p–n-junction electric industrial-electronic electronic-components reverse-voltage silicon tunnel shunt regulators impedance voltage-regulator row line chip close-up electronic equipment pcb engineering lab repairing solid-state capacitor led device closeup printed-circuit-board direct-current