Circuit Diagram - Easy project : 28 LED flasher circuit using single driver transistor BC547 some experiments can be dangerous for that you don't risk and hurt your self be safe. | Facebook
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150pcs BC547+BC557 Each 75pcs BC547B BC557B NPN PNP Transistor TO-92 Power Triode Transistor Kit Bag | Alexnld.com
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transistors - High side or low side LED driver with NPN BJT? Which is better? - Electrical Engineering Stack Exchange
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