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LabHighCurrentLoad_bb

Breadboard view of a transistor controlling a DC motor. THe breadboard is set up for power input as described above, with a DC power jack and a 7805 regulator. The left side voltage bus is unregulated, and takes its power directly from the DC power jack. The right side voltage bus takes its power from the regulator. A TIP120 transistor is connected to rows 16 to 18 in the right center section of the board. Its base is in pin 16, collector in pin 17, and emitter in pin 18. A black wire connects row 18 to the ground bus on the right. A DC motor is connected to the unregulated voltage bus on the left via a yellow wire. A green wire from the motor's other terminal connects to the transistor's collector, in row 17 in the right center section. A 1N400x diode's cathode is connected to row 18 with the emitter, and the diode's anode is connected to row 17, with the collector. A 1 kilohm resistor is connected to row 16. Its other end connects to row 12, and from there, a red wire connects to the regulated voltage bus on the right side of the board.

Breadboard view of a transistor controlling a DC motor.

Posted on August 31, 2014August 23, 2018 Full size 440 × 577

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Published inLab: Using a Transistor to Control a High Current Load

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