Majikar da Gabashin Daɗi

A cikin hakan addini da tuned collector oscillator, yana da ya gane maimakon da za suka fahimta wa ce oscillator shine kuma yadda ake yi. Oscillator shine circuit mai elektronika wanda ake amfani da shi don samun signal mai tsari ko mai asali, kamar sine wave ko square wave. Dalilin muhimmanci na oscillator shine tara DC signal zuwa AC signal. An amfani da oscillators a duk fannoni kamar TV, clocks, radio, computers, daban-daban. Duk abubuwan da suka amfani da electronics suna amfani da oscillators a gane signal mai tsari.

Wanda ake fi sani da LC oscillators shine Tuned collector Oscillator. A cikin Tuned collector Oscillator, akwai tank circuit wanda an yi ne da capacitor da inductor, kuma transistor don zama signal. Tank circuit wanda an konekte ta zuwa collector yana nuna kamar resistive load a lokacin resonance kuma ke bincike frequency na oscillator.

Bayanin Circuit Diagram na Tuned Collector Oscillator

Ya bayyana circuit diagram na tuned collector oscillator. Idan kana duba, transformer da capacitor an konekte su zuwa collector side na transistor. Oscillator a nan yana samu sine wave.
R1 da R2 suna gina voltage divider bias don transistor. Re shine emitter resistor kuma an fi sani da shi don thermal stability. Ce an amfani da shi don bypass amplified ac oscillations, kuma shi shine emitter bypass capacitor. C2 shine bypass capacitor don resistor R2. Primary na transformer, L1 tare da capacitor C1 suna gina tank circuit.

Yadda ake Yi Tuned Collector Oscillator

Idan kana biyo a yadda ake yi oscillator, ba ni iya duba karin bayani game da transistor yana ba phase shift 180 degrees idan ake amfani da shi don zama input voltage. L1 da C1 suna gina tank circuit, kuma ita ce muka samu oscillations. Transformer yana taimaka wajen ba positive feedback (zai iya duba bayanin wannan later) kuma transistor yana zama output. Ba haka, za a iya duba yadda ake yi circuit.

Idan an kula power supply, capacitor C1 yana hada da charging. Idan an haɗa shi, yana hada da discharging through inductor L1. Energy wanda ake amfani da shi a cikin capacitor a kan electrostatic energy yana zama electromagnetic energy kuma yana haɗa a cikin inductor L1. Idan capacitor ya kula discharge completely, inductor yana kula charge capacitor again. Wannan shine saboda inductors ba su iya ba current through them change quickly, kuma haka yana ba polarity across itself and keep the current flowing in the same direction. Capacitor yana hada da charging again and the cycle continues in this manner. Polarity across the inductor and capacitor changes periodically and hence we get an oscillating signal as the output.

Coil L2 yana haɗa da charging through electromagnetic induction and feeds this to the transistor. Transistors yana zama signal, which is taken as the output. Part of the output is fed back to the system in what is known as positive feedback.
Positive feedback is the feedback which is in phase with the input. The transformer introduces a phase shift of 180 degrees and the transistor also introduces a phase shift of 180 degrees too. So in total, we get a 360-degree phase shift and this is fed back to the tank circuit. Positive feedback is necessary for sustained oscillations.
The frequency of oscillation depends on the value of the inductor and capacitor used in the tank circuit and is given by:

Where,
F = Frequency of the oscillation.
L1 = value of the inductance of primary of the transformer L1.
C1 = value of capacitance of capacitor C1.

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