How does transistor diode work?

In analog, digital, and mixed-signal circuits, diodes and transistors both provide different types of switching functions, while transistors also supply signal amplification when needed. A diode can allow the flow of current in one direction while blocking the flow of current in the other direction.

How does a transistor relay work?

NPN Relay Switch Circuit A typical relay switch circuit has the coil driven by a NPN transistor switch, TR1 as shown depending on the input voltage level. When the Base voltage of the transistor is zero (or negative), the transistor is cut-off and acts as an open switch.

What is the base voltage of BC547?

BC547 is an NPN Bipolar junction transistor. It is commonly used to amplify current. A small current at its base controls a larger current at collector & emitter terminals. It has a maximum current gain of 800. The voltage at the transistor’s base is +Ve and is –Ve at the transistors emitter terminal.

What are the working States of BC547 transistor?

From the above three configurations, CE is the most widely used configuration. The working states of BC547 transistor include the following. Forward Bias. Reverse Bias. In a forward bias mode, the two terminals like emitter & collector are connected to allow the flow of current through it.

What is the working principle of BC547?

3. BC547 Working Principle. When the input voltage is applied at its terminal, some amount of current starts to flow from base to the emitter and controls the current at collector. The voltage between the base and the emitter (VBE), is negative at the emitter and positive at the base terminal for its NPN construction.

How many terminals does a BC547 have?

Similar to all the other transistors BC547 has also three terminals e.g. collector terminal, base terminal and emitter terminal respectively. The amount of current flowing from base to the emitter controls the amount of the current flowing through the collector.