Dengê Çavkaniya Pêşdînker

Pêşîngirina serdemiyekan tuned collector oscillator, pirûbên li ser çi bûye oscillator û çi dike wateyê pêk bikin. Oscillator yekîna qalaxa elektronîk e ku sinyalê hilberdixan an dawî yên perîodik taybetand, wek sinyalê sine û square wave. Naveroka sereca oscillator dikeve sinyala DC bi sinyala AC biguherîne. Oscillators digehîn kêfên çendrêz îlîh û televîzyon, saet, radio, komputeran, v.b. Hemin hewce dikare ji bo çendrêz êlektronîk û hewçarîyan re bîguhêre.

Yekan ji oscillatorsan LC herî basîtan yekîna tuned collector oscillator e. Di tuned collector oscillator de, tank circuit ekane me kapasitor û indüktor û transistorek da ku sinyala zêde bike. Tank circuit ku bi collector tê gotin wek malpera direzan derbarayê ve resonekirin û frekança oscillator decide dike.

Terîf û Şema Circuite ya Tuned Collector Oscillator

Di vir de şema tuned collector oscillator. Wekî dişî, transformer û kapasitor bi tarafê collector transistora tê gotin. Oscillator lê sinyala sine wave taybetand.
R1 û R2 voltage divider bias bi transistora tê gotin. Re referandî ye ji bo emitter resistor û jî dike thermal stability provide bike. Ce bikar îne ji bo bypass û amplified ac oscillations û emitter bypass capacitor e. C2 bypass capacitor e ji bo resistor R2. L1 primary transformer û C1 tank circuit form dike.

Çalakîya Tuned Collector Oscillator

Piştî ku bi çalakîya oscillator re girîn, beji ber bi rêzikî ku transistora phase shift 180 degree dide dema ku input voltage amplify bike. L1 û C1 tank circuit form dike û ji wan divê oscillations betejînin. Transformer positive feedback (piştî de werdigire) daye û transistora output amplify bike. Bi vê taybetand, hûn dikarin çalakîya circuit biafirînin.

Dema ku power supply turned on bike, C1 charging bike. Dema ku fully charged bike, discharging bike bi inductor L1. Electrostatic energy stored in the capacitor electromagnetic energy tê gotin û stored in the inductor L1. Dema ku capacitor completely discharged bike, inductor capacitor recharge bike. Ji ber ku inductors current through them change quickly ne, polarity across itself change bike û current flowing in the same direction continue bike. Capacitor charging bike û cycle continues in this manner. Polarity across the inductor and capacitor changes periodically û oscillating signal as the output betejînin.

Coil L2 charged bike bi electromagnetic induction û feeds this to the transistor. Transistors amplify the signal, which is taken as the output. Part of the output fed back to the system in what is known as positive feedback.
Positive feedback feedback e ku in phase with the input e. Transformer introduces a phase shift 180 degrees û transistora also introduces a phase shift 180 degrees too. So in total, 360-degree phase shift get û this fed back to the tank circuit. Positive feedback necessary for sustained oscillations.
Frequency of oscillation depends on value of the inductor û capacitor used in the tank circuit û 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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