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Amazon.com: 10x TIP120 NPN BJT ST Darlington Transistor TO-220 for Arduino with Free Diodes : Industrial & Scientific
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STMicroelectronics TIP120 TO-220 NPN Power Darlington Transistor 1 Piece: Amazon.com: Industrial & Scientific
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TIP120 Power Darlington Transistors - 3 pack : ID 976 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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