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Calibrating instruments…
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The one-way valve — diodes, the knee voltage and Zener breakdown, traced by hand.
The CBSE Class 12 semiconductor practicals as real bench circuits you operate: turn the source up and log the diode's current point by point to trace its I–V characteristic, watch the forward current stay near zero until it passes the knee, then reverse the bias to catch the tiny leakage — and, with a Zener, the sudden clean breakdown. Every reading comes from the simulated ammeter and voltmeter, built on the real diode equation.
Beyond the open showcase, subscribed schools get the growing library of Semiconductor Electronics experiments — searchable, tagged by concept and difficulty, and expanding continuously.