The BC547 is a NPN transistor meaning when power is applied to the base (control pin) it will flow from the collector to the emitter. Typically NPN transistors are used to “switch ground” on a device, meaning, they are placed after the load in a circuit. BC547 NPN Silicon Epitaxial Planar Transistor , Designed for use in Audio Amplifier and switching Applications. Capable of 0.625 Watts of Power Dissipation, Max Collector-current = 100mA Max Working Voltage = 50 Volts DC
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