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Awesome Transistor Projects | BC557 & BC558 PNP Transistor Projects | RGB LED Projects | DIY - YouTube
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Bc547b Bc557b Each 50pcs All 100pcs/bag Bc547 + Bc557 Npn Pnp Transistor To-92 Triode Transistor - Transistors - AliExpress
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Bridgold 100pcs(50pcs BC547+50pcs BC557) NPN PNP Bipolar PBP Low Power Transistor 100mA,3-Pin: Amazon.com: Industrial & Scientific
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