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Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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BC547 NPN Transistor: Pinout, Datasheet, and Circuit
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20pcs Solar LED Driver YX8018 Joule Thief DCDC Converter Booster 4 pin IC For Driving Solar Powered Garden LED lights|led driver ic|ic solaric yx8018 - AliExpress
Enhanced offline driver lights an LED string-Power/Smart Energy-EDN Asia
