Generally, human body emits infrared energy which is sensed by the PIR sensor from a considerable distance. The output from the PIR sensor i.e., passive infrared detector is amplified to a transistor BC547, the output of which at the collector is connected to pin 1 of the microcontroller. ...
Transistor BC547: It is a NPN bipolar junction transistor and it is used mainly for amplification and switching purpose. Its features include maximum current gain of 800.It is used in CE configuration when used as an amplifier. Battery: A DC supply of 9V is given through a battery to power...
As I recall, A BC337-16 (usually marked as per Graham’s sample BC33716) is a BC337 with an HFE(current gain) around 160. You also get BC33725 with an HFEaround 250 and a BC33740 with an HFEaround 400. These values are confirmed by Elizabeth’s datasheet, although it does not...
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What Is a BC547 Transistor? What Is an Epitaxial Transistor? What Is a 2N Transistor? What are the Basics of Transistor Substitution? Discussion Comments Bybagley79— On Aug 01, 2011 I still keep a transistor radio around the house and make sure I always have batteries for it. There have...