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How do you find base emitter collector of npn transisitor using notch?
Wiki User
∙ 13y ago
Find the notch in the transistor, turn it towards you, point the leads down. From left to right is the Emitter, Base , Collector.
Wiki User
∙ 13y ago
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Transistor as an amplifier common emitter configuration explanation using kirchhof's law?
Kirchoff's current law states that the current in every point in a series circuit is the same. In the case of a transistor in common emitter configuration, you can take advantage of that fact and state that the collector current is equal to the emitter current. The truth is somewhat different, because the gain of the transistor is not infinity, so the base current must be added to the emitter current. With a reasonably high gain, however, you can ignore the base current. Consider that the emitter voltage is related to the base voltage by the forward drop of the base-emitter junction, about 0.7 volts, and the collector and emitter currents are the same. Now look at the collector and emitter resistors. If the currents are the same, and the voltage across the emitter resistor is known, then you know the voltage across the collector resistor as well. This is an application of both Kirchoff's and Ohm's laws. The gain, then, of this amplifer is collector resistance divided by emitter resistance. It is an inverting amplier in this configuration. In some configurations, the emitter resistor is zero ohms. This does not mean the gain is infinity - it now means that the gain is limited by the gain of the transistor, which it is anyway - the emitter resistor is used to stabilize the gain and reduce dependency on individual transistor gains, which do vary.
Can you use transistor as diode?
its the simplest thing to do. There are three legs in a transistor, one each of collector, base and emitter. So if you need to use it as a diode, just connect either collector-base or emitter-base. Say, if you use an NPN transistor, then the base region will be the anode of diode and emitter or collector will be the cathode of the diode.
How does using a transistor with a different beta affect the operation of the common emitter amplifier?
Gain, in the common emitter amplifier, is beta (hFe) or collector resistance divided by emitter resistance, whichever is less. Substituting a different beta (hFe) transistor will affect gain, if hFe is less, or increase stability and design margin, if hFe is greater.
How do NPN transistors work?
on or off
What is the relationship between common base and common collector?
It all depends which lead is connected to the common power supply, Emitter, base or collector. For most amplification needs using NPN transistors, common emitter is used. Other applications are used for current control and regulation circuits.
Transistor as an amplifier common emitter configuration explanation using kirchhof's law?
Kirchoff's current law states that the current in every point in a series circuit is the same. In the case of a transistor in common emitter configuration, you can take advantage of that fact and state that the collector current is equal to the emitter current. The truth is somewhat different, because the gain of the transistor is not infinity, so the base current must be added to the emitter current. With a reasonably high gain, however, you can ignore the base current. Consider that the emitter voltage is related to the base voltage by the forward drop of the base-emitter junction, about 0.7 volts, and the collector and emitter currents are the same. Now look at the collector and emitter resistors. If the currents are the same, and the voltage across the emitter resistor is known, then you know the voltage across the collector resistor as well. This is an application of both Kirchoff's and Ohm's laws. The gain, then, of this amplifer is collector resistance divided by emitter resistance. It is an inverting amplier in this configuration. In some configurations, the emitter resistor is zero ohms. This does not mean the gain is infinity - it now means that the gain is limited by the gain of the transistor, which it is anyway - the emitter resistor is used to stabilize the gain and reduce dependency on individual transistor gains, which do vary.
How do you measure IGBT?
Digital multi-meter (DMM) test procedure:Equipment Requirement - DMM with diode check mode and battery voltage less than 20V. (Typical units using 9V battery are OK).Collector-Emitter Junction test: With the module out of circuit remove the conductive foam and short the gate to emitter.With DMM in diode check mode, the collector to emitter should give a normal diode reading with positive on the emitter and negative on the collector.The DMM should read open or infinite with positive on the collector and negative on the emitter. Damaged IGBTs may test as shorted in both positive and negative directions, open in both directions, or resistive in both directions.Gate Oxide test: With the DMM in resistance mode the resistance from gate to collector and gate to emitter should read infinite on a good device. A damaged device may be shorted or have resistive leakage from gate to collector and/or emitter.
Can you use transistor as diode?
its the simplest thing to do. There are three legs in a transistor, one each of collector, base and emitter. So if you need to use it as a diode, just connect either collector-base or emitter-base. Say, if you use an NPN transistor, then the base region will be the anode of diode and emitter or collector will be the cathode of the diode.
How does using a transistor with a different beta affect the operation of the common emitter amplifier?
Gain, in the common emitter amplifier, is beta (hFe) or collector resistance divided by emitter resistance, whichever is less. Substituting a different beta (hFe) transistor will affect gain, if hFe is less, or increase stability and design margin, if hFe is greater.
How do NPN transistors work?
on or off
What are the advantages and disadvantages in using common collector amplifier?
Current gain. At the cost of no voltage gain.
What is the relationship between common base and common collector?
It all depends which lead is connected to the common power supply, Emitter, base or collector. For most amplification needs using NPN transistors, common emitter is used. Other applications are used for current control and regulation circuits.
Define current gain of a common emitter configuration?
The voltage gain of a common emitter transitor amplifier is (inverted) collector resistor divided by emitter resistor, unless this would exceed hfe or the transistor is operating in non-linear mode.
Working of npn transistor?
N-p-n transistor is made by sandwiching thin layer of p-type semiconductor between two layers of n-type semiconductor. It has three terminals, Emitter, Base and collector. The npn transistor has two supplies, one is connected through the emitter base and one through the collector base. The supply is connected such that emitter-base are forward biased and collector base are reverse biased. It means , Base has to be more positive than the emitter and in turn, the collector must be more positive than the base. The current flow in this type of transistor is carried through movement of electrons. Emitter emits electrons which are pulled my the base as it is more positive. these end up in the collector as it is yet more positive. In this way, current flows in the transistor. Transistor can be used as an amplifier, a switch etc.
What is meant by compensation in transistor?
Temperature (assumed) compensation in a transistor is when you limit gain using resistors so that gain is dependent on resistor ratio instead of on hFe. As an example, in a common emitter, class A, configuration, with the emitter grounded, the gain is hFe. Problem is that hFe varies from device to device, and it is temperature sensistive, having a positive temperature coefficient, making thermal runaway a very real problem. You can compensate for this with an emitter resistor. In combination with the collector resistor, gain is collector resistance divided by emitter resistance, or hFe, whichever is less. If you make sure that hFe is always greater than this ratio, then the gain will be stable and predictable.
How can check a transistor with digital multimeter?
If your multimeter has a transistor check (hfe), then place the Collector,Base& Emitter in the CBE port of multimeter. Turn the shaft to Diode mode. If the value is zero,skip that transistor. You can use the forward resistance of each junction, using the ohms range or diode check function. Put the leads on the Base and Emitter, then reverse the leads. You should get about 600Ohms forward bias and open circuit (infinity) reverse bias. Do the same between the Base and Collector. You should get the same results. Finally put the leads between the Collector and Emitter. You should get open circuit both ways around. Be aware that some high power transistors have a diode across the Emitter and Collector. These tests will just be a basic 'go - no go' test. It may pass this test and yet still not perform fully. You can see obvious faults, like a dead short both ways on each junction or across the Emitter to Collector.
How do i design logic gates for AND using BJT?
By just connecting two BJT such that both gets inputs at the BASE and emitter of one is connected to the collector of another BJT. Then the upper transistor should provide potential about 15V at the collector and the emitter of of the lower BJT is grounded as well as taken output. This will give you results according to the truth table of AND logic gate but mind it that result will not in 0 and 1 rather in high and low voltages.
