How to check the transistor with digital multimeter | transistor testing/Fet Mosfet testing in urdu
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- čas přidán 29. 08. 2024
- we learn about how to check the transistor with the help of digital multimeter and also check the BJT FET MOSFET transistor easily
A transistor can use a small signal applied between one pair of its terminals to control a much larger signal at another pair of terminals. This property is called gain. It can produce a stronger output signal, a voltage or current, which is proportional to a weaker input signal and thus, it can act as an amplifier. Alternatively, the transistor can be used to turn current on or off in a circuit as an electrically controlled switch, where the amount of current is determined by other circuit elements.
There are two types of transistors, which have slight differences in how they are used in a circuit. A bipolar transistor has terminals labeled base, collector, and emitter. A small current at the base terminal (that is, flowing between the base and the emitter) can control or switch a much larger current between the collector and emitter terminals. For a field-effect transistor, the terminals are labeled gate, source, and drain, and a voltage at the gate can control a current between source and drain.
The image represents a typical bipolar transistor in a circuit. A charge will flow between emitter and collector terminals depending on the current in the base. Because internally the base and emitter connections behave like a semiconductor diode, a voltage drop develops between base and emitter while the base current exists. The amount of this voltage depends on the material the transistor is made from and is referred to as VBE.
Transistor as a switch
BJT used as an electronic switch, in grounded-emitter configuration.
Transistors are commonly used in digital circuits as electronic switches which can be either in an "on" or "off" state, both for high-power applications such as switched-mode power supplies and for low-power applications such as logic gates. Important parameters for this application include the current switched, the voltage handled, and the switching speed, characterized by the rise and fall times.
In a grounded-emitter transistor circuit, such as the light-switch circuit shown, as the base voltage rises, the emitter and collector currents rise exponentially. The collector voltage drops because of reduced resistance from the collector to emitter. If the voltage difference between the collector and emitter were zero (or near zero), the collector current would be limited only by the load resistance (light bulb) and the supply voltage. This is called saturation because the current is flowing from collector to emitter freely. When saturated, the switch is said to be on.
Providing sufficient base drive current is a key problem in the use of bipolar transistors as switches. The transistor provides current gain, allowing a relatively large current in the collector to be switched by a much smaller current into the base terminal. The ratio of these currents varies depending on the type of transistor, and even for a particular type, varies depending on the collector current. In the example light-switch circuit shown, the resistor is chosen to provide enough base current to ensure the transistor will be saturated.
In a switching circuit, the idea is to simulate, as near as possible, the ideal switch having the properties of an open circuit when off, the short circuit when on, and an instantaneous transition between the two states. Parameters are chosen such that the "off" output is limited to leakage currents too small to affect connected circuitry, the resistance of the transistor in the "on" state is too small to affect circuitry, and the transition between the two states is fast enough not to have a detrimental effect.
Transistor as an amplifier
Amplifier circuit, common-emitter configuration with a voltage-divider bias circuit.
The common-emitter amplifier is designed so that a small change in voltage (Vin) changes the small current through the base of the transistor whose current amplification combined with the properties of the circuit means that small swings in Vin produce large changes in Vout.
Various configurations of single transistor amplifiers are possible, with some providing current gain, some voltage gain, and some both.
From mobile phones to televisions, vast numbers of products include amplifiers for sound reproduction, radio transmission, and signal processing. The first discrete-transistor audio amplifiers barely supplied a few hundred milliwatts, but power and audio fidelity gradually increased as better transistors became available and amplifier architecture evolved.
Modern transistor audio amplifiers of up to a few hundred watts are common and relatively inexpensive.
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ماشاءاللہ اللہ پاک آپ کو خوش رکھے اور کامیاب کرے آمین
Assalam o alaikum mry pas pwm tha lakin vo kharab ho gya tha mai bht prayshn ho gya tha k ab isko ksy thek kru phr mny apki video dekhi phr mujhe transistor ko check krna a gya phr mny pta chala liya k kha sy mera pwm kharab b apki video bht helpful sabit hoi mry liye is liye mny apki video ko like kiya or sath he subscribe b kr liya apka channel allah kush rekhy apko ameen suma'ameen
Boht acha
Good
Sir IC ko b chek krny ki video bnao
Hello sir mera same multimitter hai usme battry daltehi auto light on hota hai par usme koi bhi numbar nahi dikhata usme laga huwa transistor npn transistor pe 2 leg short hai par wo transistor hata diya to bhi wohi point pe check kiya to short dikhata hai
Transistor meter ka hy?
Sig agar reading 600 se ziada reading ho to theek hoga k kahrab
800 ya us sy upar wala khrab ho ga
Max 700 800 k pass jata
Rvtdtc144 estکو چک کرنے کا کیا طریقہ ہے
Aslamoalakum bhai no aap ye meter use Mar rehy hein isi ut33a jota hy no auto jota hy is mein ac dc volt mein masla aa raja by air is ki selector nob ki pattrian agy pechy hi hein plzzz is ki deteil send Mar dein meter ki nob ki anders wali side ki pictures vhi bhej dein aap ka but buht thanks hga mera meter zaea hi raha hy plzzzzz help me thanks
Selector switch kesy disturb howa?
Khola tha usy ya khud he ho gaya?
@@amirshafique9108 aslamoalakum sir aap kesy hein ac dc volt mein masla aa gea tha is leay khola tha baad me mein kisi ma'am se gea to wapsi mein pechy se larky ne switch kharab kar dea
Plzzz sir plzzzzz help me
Mosafatee nahi bhai Mosfet