Triode, the full name should be semiconductor transistor, also known as bipolar transistor.Crystal transistor, is a current control current semiconductor device - its role is to amplify weak signals into a larger value of the electrical signal, with current amplification, also used as a non-contact switch, is the core component of electronic circuits.Let's learn about the working principle of transistors.Role.Measurement and other related information.

9013 transistor

9013 is an NPN type small power triode.Triode, one of the basic semiconductor components, has a current amplifying effect and is the core component of electronic circuits.Triode is made on a semiconductor substrate two PN junctions close to each other, two PN junctions to the whole semiconductor into three parts, the middle part is the base area, the two sides of the part is the emission area and collector area.Triode arrangement of PNP and NPN two. s9013NPN triode main use: as audio amplification and radio 1W push-pull output and switch, etc. 9013 triode pin parameters parameters: structure NPN collector: emitter voltage 25V collector: base voltage 45V emitter: base voltage 0.7V

8050 transistor

8050 transistor is a very common NPN type crystal transistor, it is often seen in various amplification circuits, with a wide range of applications, mainly for high frequency amplification.It can also be used as a switching circuit. 8050 transistor parameters: type: switching type; polarity: NPN; material: silicon; maximum collector current (A): 0.5A; DC gain: 10to60; power consumption: 625mW;

Triode measurement

.
The specific method is to set the multimeter to the resistance block R × 1k block, first with the red pen on one leg of the transistor, with the black pen to touch the other two legs of the transistor, if all pass twice, then the red pen is placed on the foot of the transistor base (B).If not found once, the red meter pen to another foot of the transistor, and then measured twice; if not found, the red meter pen and then change, and then measured twice.If still not found, then switch to the black meter pen on one leg of the triode, with the red meter pen to test twice to see if all through, if a failure to replace.Measure up to 12 times in this way, you can always find the base.There are only two types of transistors, namely PNP and NPN types.


Role of

transistors

The crystal triode has a current amplification effect, the essence of which is that the triode can control a large change in collector current with a small amount of change in base current.This is the most basic and important characteristic of a transistor.The current amplification is a constant value for a particular transistor, but it changes somewhat with the change of the base current during the operation of the transistor.

Working principle of transistors

There are two types of crystal transistors (hereafter referred to as transistors) by material: germanium tubes and silicon tubes.And each of them has two structural forms NPN and PNP, but the most used are silicon NPN and germanium PNP two kinds of transistors, (where N indicates the addition of phosphorus in high-purity silicon, refers to the replacement of some silicon atoms, in the voltage stimulation to produce free electrons to conduct electricity, and p is the addition of boron instead of silicon, producing a large number of holes to facilitate the conductivity) I.Current Amplification Principle The following analysis is only for NPN type silicon transistors.We call the current flowing from the base B to the emitter E the base current Ib; the current flowing from the collector C to the emitter E the collector current Ic. The direction of both currents is out of the emitter, so the emitter E on the use of an arrow to indicate the direction of the current.The amplifying effect of the triode is that: the collector current is controlled by the base current