Electronics Circuits Embedded PIC Micro Controller Tutorials : How to Calculate Base Resistance required for the Transistor / How to Drive a relay or a High Current Load using a Transistor
Transistor as a Switch | Breadboard | Maker Pro
Embedded Life: Make a simple touch switch using BC547 for LED, RELAY,BUZZER
Top 3 Electronics Projects using BC547 Transistor | Hackaday.io
How to connect a BC547 transistor for making a switching circuit - Quora
BC547 Transistor as a switch
BJT Switch and Microcontroller - Codrey Electronics
BC547 NPN Transistor (Switch & Amplification) - South Africa Arduino, Robotics & Electronics Supplier South Africa: R2.49
BC547 NPN Transistor as a switch - Arduino example with LED Flash - YouTube