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Transistors have many characteristics and they most certainly require voltages to be a certain polarity if they are to work properly. There are two main types of transistor: PNP and NPN. They are identical except that all polarities are reversed on one compared to the other. There are many books and online resources that describe transistors but here is a very brief note about transistor operation. Each transistor has a base, a collector and an emitter. When a small current is passed from the base to the emitter, a larger current will pass from the collector the the emitter. With an NPN transistor, the base needs to be positive with respect to the emitter and the collector also has to be positive with respect to the emitter for the transistor to work. A PNP transistor is reversed, where both the base and the collector need to be negative with respect to the emitter to operate. Therefore, transistors do indeed have a polarity, even if it is more complex that some other devices. Disclaimer: The above description of transistor operation is greatly simplified and there are operational modes that are outside the conditions described. Please don't use the above description as a definitive guide to transistor behaviour.
What else can I help you with?
What is the purpose of the Unijunction Transistor?
A Unijunction Transistor is a transistor that acts solely as a switch.
How do you check transistor faulty or not?
the best way is to compeair the data sheet of that transistor to the readings of that transistor. . . . .and u can get the readings of that transistor by using a fungction genrator and a c.r.o
What is dual gate transistor?
Transistor with 2 gate on top and bot of the channel
What is the aim of the transistor?
When facing the flat side of the transistor, the Emitter - E - is on the left.
What is the amplification capacity of a typical transistor?
typically the amplification of a transistor 100 times.
Why to use pnp transistor in fire alarm circuit?
You can use a PNP or an NPN transistor in a fire alarm circuit. Both will work. It all depends on how you want to energize the alarm, and with what polarity of signal.
Is the pnp transistor in common collector can be replaced with npn transistor?
No. The PNP and NPN transistors are exactly opposite each other in polarity. You cannot just replace one for the other without redesigning the circuit.
Why is it important that the two capacitors must have their positive terminal toward the transistor?
A: It is not important what is important it that the capacitor has the correct polarity across its terminals otherwise it will not function correctly
Why do you need to structure transistor as diode?
A transistor is not a diode. It is also not a pair of back to back diodes. Two diodes connected back to back will not function like a transistor because their junctions are not in close proximity like they are in a transistor. The only reason for "thinking" that a transistor is "like" a pair of back to back diodes is for purposes of quick go-nogo testing with a multimeter, but that will only assess open, short, and leakage status, as well as polarity, but not any of the more useful things, such as hFe.
Is there a PNP as in transistor vacuum tube?
No. The PNP or NPN of a transistor refers to the doping or impurities introduced to the silicon during manufacturing, and changes the polarity of the supply voltage to each pin. In a vacuum tube, the anode is always positive, the cathode is always negative. The control grid can vary between more negative than the cathode to cut off current flow, up to equal to the potential of the cathode, at which point the tube is saturated, or at full current. There is no 'reverse polarity' tube to correspond with the two types of transistor.
Why is the polarity of capacitors in RC coupled amplifiers such that the negative terminal receives the input signal?
The input signal is assumed to have zero DC bias. Input stages will typically have a positive bias on the base or grid, respectively, of the first stage transistor or tube. So, the input terminal is more negative. ANSWER: The polarity of the capacitor is determined by the bias polarity as used. If the bias is negative then the capacitor negative terminal must be connected to it.
What is Si transistor?
A silicon transistor is a transistor made of silicon.
Which transister is used in emitter follower circuit?
A: Any transistor of either polarity can be used as an emitter follower, The purpose of an emitter follower is to provide current to the load since it cannot provide any voltage gain
Why ujt have this type of symbols?
The symbols in the unijunction transistor show its internal configuration. The emitter (arrow) represents the polarity. When it points in that is a P type transistor. Pointing out is an N type. The the table on its side the table top touching the emitter (arrow). Its' "legs" are the connection to two bases in the device. It does not have a collector. Refer to another Wiki answer for more info.
Is active is a cutoff region of transistor?
The active region of a transistor is when the transistor has sufficient base current to turn the transistor on and for a larger current to flow from emitter to collector. This is the region where the transistor is on and fully operating.
What is the purpose of the Unijunction Transistor?
A Unijunction Transistor is a transistor that acts solely as a switch.
What are the Similar transistor for 221334 PNP transistor?
Similar to a 2N3906 PNP transistor
