Figure 8 shows a red light-emitting diode connected via a series resistor of 1 kiloohm between +5 V on the PCB with 70x80mm solder points and the collector of an NPN transistor BC547B. Its base is ...
School of Environmental Science and Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, 200240, China ...
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