How do you control the base current of an NPN transistor?
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How do you control the base current of an NPN transistor?
NPN Transistor Circuit The load resistance also used to reduce the maximum current flowing through the device. The base terminal is connected to the positive terminal of base supply voltage VB with base resistance RB. The base resistance is used to limit the maximum base current.
What is used to protect high currents from damaging a transistor?
Crowbar protection circuit is a type of overvoltage protection which is most commonly used in electronic circuits. Here in this circuit, Zener Diode and Bipolar Transistor are used for automatic overvoltage protection.
What is the minimum turn on voltage for an NPN transistor?
That is, minimum input voltage should be minimum of 3.3V to turn on the transistor (T).
How do you protect a transistor in a circuit?
Usually you add a backwards diode for protection, because when you turn off the relay, the magnetic field in the coil collapses and tries to keep the current flowing, if there is no escape path, it turns into a high-voltage pulse that can destroy anything connected to the coil, adding the diode bleeds the pulse off to …
How do you control a transistor?
Add a Switch to Control the Transistor To turn on the transistor, you need a voltage difference between the base and the emitter of at least 0.7V. Since the emitter is attached to ground, that means any voltage over 0.7V applied to the base will turn the transistor on.
How can I use npn transistor as a switch?
NPN Transistor as a Switch Based on the voltage applied at the base terminal of a transistor switching operation is performed. When a sufficient voltage (VIN > 0.7 V) is applied between the base and emitter, collector to emitter voltage is approximately equal to 0. Therefore, the transistor acts as a short circuit.
How much current can a NPN transistor handle?
This particular transistor is rated for a maximum (collector-emitter) voltage of 20V, and a maximum current of 500 mA. This means that you can switch a (small) 12V device with the transistors you have.