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NPN Darlington power transistor

TIP122 Basic Circuit

Build a basic TIP122 circuit with labeled pins, component values and connection guidance.

TIP122 in a circuit

A modest resistive load makes the current paths explicit.

TIP122 12V100ohmload5Vcontrol1kbase10kpulldownB1C2E3.
Original circuit; the collector tab is live and the displayed readings are calculated.

Connect it, step by step

Follow the component values and pin connections

Load

Connect the 100 Ω load to collector pin 2.

Drive

Feed base pin 1 through 1 kΩ.

Return

Join emitter pin 3 to the common return.

Component view