When a transistor is used as a switch it is operated in the Saturation and Cut-Off Region. Driver modules for LED, electronic relay.General switching and amplification purposes.We must supply current to the base pin of a transistor to operate it, and this current (IB) should be limited to 5mA. The maximum current that can flow through the Collector pin is 100mA, we can't use this transistor to connect loads that use more than 100mA.
The gain value of the BC547 transistor ranges from 110 to 800, and this value determines the transistor's amplification capacity. This transistor is commonly used for amplification of current as well as switching purposes.
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