BJT Explained in Nepali | Full Unit Physics / Electronics NPN & PNP, CE/CB/CC, | MrNiriTeach” NEB

Описание: नमस्ते साथीहरू!
आजको भिडियोमा हामी BJT (Bipolar Junction Transistor) को पुरा unit line-to-line नेपालीमा बुझ्नेछौं।
BJT एकदमै महत्वपूर्ण electronic device हो जसले small signal amplification र switching दुबै काम गर्छ।
यस भिडियोमा हामी सिक्नेछौं:
BJT को Definition – Bipolar Junction Transistor के हो र किन यसलाई Bipolar Junction Transistor भनिन्छ।
BJT को Types – NPN र PNP structure, arrow direction, majority carrier difference, real-life examples।
Advantages of BJT – High current gain, voltage gain, low cost, fast switching, reliability।
BJT Working Principle – Biasing condition, Emitter–Base junction forward bias, Collector–Base junction reverse bias, electron flow, hole flow, real-life amplification example।
Common Configurations – CE, CB, CC।
Common Emitter (CE) – High voltage & current gain, 180° phase shift, derivation of IC, IB, IE relation, VCE formula, real-life audio amplifier example।
Common Base (CB) – High voltage gain, low current gain, input/output resistance, derivation α = IC / IE, real-life RF amplifier example।
Common Collector (CC) – Voltage gain ~1, current gain high, in-phase output, buffer/impedance matching example।
BJT as a Switching Device – Cut-off (OFF), Saturation (ON), input/output conditions, LED, motor, relay control example।
Transistor Characteristics – Input characteristics (IB–VBE), Output characteristics (IC–VCE), Regions (Cut-off, Active, Saturation), practical application in amplifier design।
DC Load Line – Definition, intercepts (IC max = VCC/RC, VCE max = VCC), Q-point explanation, step-by-step plotting, real-life amplifier design relevance।
Derivations & Formulae – Line-to-line Nepali explanation:
IC = β IB, IE = IC + IB
α = IC / IE, IC ≈ α IE
VCE = VCC – IC RC
Real-Life Examples & Applications –
Mobile phone amplifier
LED switch circuits
Radio & TV amplifier
Motor driver circuits
RF amplifier (CB configuration)
Exam Tips & Important Notes – Key points, Q-point selection, current gain, voltage gain, phase difference, common mistakes students make।
Visuals & Diagrams – Each concept with CE/CB/CC diagram, DC Load Line, switching circuit illustration, transistor symbol (NPN/PNP), current arrows (IC, IB, IE) for easy understanding।
Summary Table – Types, configurations, advantages, regions, gain, phase difference, input/output resistance।
यस भिडियोले तपाईंलाई BJT को पुरा unit line-to-line नेपालीमा बुझाउनेछ, real-life examples, derivation, diagrams, exam tips र practical applications सहित।
यदि तपाईं CSIT, Class 12 Physics वा entrance exam को तयारी गरिरहनु भएको छ भने, यो भिडियो एकदमै उपयोगी छ।
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