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Voltage Controlled Switch by BC547 - EEWeb
arduino - BC547/BC548 with 5V at base can't control 12V at collector-emitter? - Electrical Engineering Stack Exchange
BC547 NPN Transistor (Switch & Amplification) - South Africa Arduino, Robotics & Electronics Supplier South Africa: R4.33
PNP TRANSISTOR AS A SWITCH | Transistors, Turn ons, Led lights
How To Make Touch On Off Switch | Touch Switch Circuit | bc547 touch switch circuit – Earth Bondhon
arduino - 3v output to switch on transistor for 5v fan - Electrical Engineering Stack Exchange
BC547 transistor pinout characteristics -
How to use BC547 as a switch - Quora
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
Touch Switch Circuit using Transistor
TRANSISTOR BC547 AS A SWITCH & AMPLIFER » PIJA Education
Embedded Life: Make a simple touch switch using BC547 for LED, RELAY,BUZZER