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What voltage difference between the base and emitter is required to turn an LED on?
We’re forward-biasing the base-emitter diode to turn the load on. The diode only needs 0.6V to turn on, more voltage than that means more current. Some transistors may only be rated for a maximum of 10-100mA of current to flow through them. If you supply a current over the maximum rating, the transistor might blow up.
What is relationships between A and B?
A relation from A to B is a set of ordered pairs (a, b) such that a ∈ A and b ∈ B. In other words, a relation from A to B is a subset of A × B. If A is a set then a relation on A means a relation from A to A. We often write aRb to mean (a, b) ∈ R.
Which leg is which on a transistor?
Transistors typically have one round side and one flat side. If the flat side is facing you, the Emitter leg is on the left, the Base leg is in the middle, and the Collector leg is on the right (note: some specialty transistors have different pin configurations than the TO-92 package described above).
What is the base emitter voltage for a PNP transistor?
In active region, the emitter junction (JE) is forward biased and the collector junction (JC) is reverse biased. The typical base-emitter voltages (VBE) for both npn and pnp transistors are as follows: If the transistor is made up of a silicon material, the base-emitter voltage (VBE) will be 0.7 V.
What do you need to know about bipolar NPN transistors?
One other point to remember about Bipolar NPN Transistors. The collector voltage, ( Vc ) must be greater and positive with respect to the emitter voltage, ( Ve ) to allow current to flow through the transistor between the collector-emitter junctions.
Why is base-emitter voltage in transistor always assumed as 0.6 V?
It appears that base-emitter voltage (Vbe) in transistor is always assumed as 0.6 V in circuit analysis. I’ve seen one figure (see attached image).
What are the properties of a bipolar junction transistor?
One of the most important properties of the Bipolar Junction Transistor is that a small base current can control a much larger collector current. Consider the following example. A bipolar NPN transistor has a DC current gain, ( Beta) value of 200. Calculate the base current Ib required to switch a resistive load of 4mA.