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PNP Darlington power transistor

TIP127 Basic Circuit

Build a basic TIP127 circuit with labeled pins, component values and connection guidance.

Package view

TIP127 in a circuit

Emitter supply and base-drive reference remain explicit.

TIP127 emitter3to12V collector2to100ohmground base1through1kto12Voff7Vondriver and10kbaseemitterreturn.
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

Supply

Emitter pin 3 connects to +12 V; collector pin 2 feeds the load.

Drive

A 1 kΩ resistor limits the base current drawn by the buffered driver.

Return

10 kΩ returns base to emitter; the load and driver share ground.

Component view