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Author: Admin | 2025-04-28
LEDIntegrated Circuits (ICs)Application Specific Integrated Circuits(ASICs)BatteryVoltage and Current SourceLet us understand why the above-given devices fall under the category of active components.Active Component- Bipolar Junction Transistor (BJT)We can use a transistor as a switch and as an amplifier. The small DC voltage controls the base current, and it leads to an increase of collector current according to the current gain of the transistor((IC =β IB). Where β is the current gain of the transistor. The below circuit shows how the transistor functions as an amplifier.VCC and VBB is the supply voltage for the collector and base of the transistor. The transistor gets proper biasing at the base terminal in order to flow of base current. The small base current adds to the main signal current, and thus we get an amplified signal at the collector.From the above explanation, it is lucid that without external DC voltage the transistor can not function. That is why the transistor is an active component.Active Component- Silicon Controlled Rectifier (SCR)We use a Silicon-controlled rectifier (SCR) as a switch & AC voltage controller. By changing the firing angle the voltage is controlled. The SCR is widely used in DC drive, soft starter applications. Thus, the SCR functions only if it gets a trigger pulse at its gate terminal.It is clear that SCR functions on the application of an external power source at its gate terminal, therefore SCR is an active component.The external voltage applied to the gate terminal of the SCR makes it ideal for the
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