Tuned Collector Oscillator – Electronic Circuits And Diagram-electronics Projects And Design 4h2v2y
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Tuned Collector Oscillator Last Updated on February 4, 2014 by jojo in Oscillators with 4 Comments
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Tuned collector oscillator. Tuned collector oscillation is a type of transistor LC oscillator where the tuned circuit (tank) consists of a transformer and a capacitor is connected in the collector circuit of the transistor. Tuned collector oscillator is of course the simplest and the basic type of LC oscillators. The tuned circuit connected at the collector circuit behaves like a purely resistive load at resonance and determines the oscillator frequency.The common applications of tuned collector oscillator are RF oscillator circuits, mixers, frequency demodulators, signal generators etc. The circuit diagram of a conventional tuned collector oscillator is shown in the gure below.
Circuit diagram.
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In the circuit diagram resistor R1 and R2 forms a voltage divider bias for the transistor. Re is the emitter resistor which is meant for thermal stability. It also limits the collector current of the transistor. Ce is the emitter by- capacitor. The job of Ce is to by- the ampli ed oscillations. If Ce is not there, the ampli ed AC oscillations will drop across Re and will add on to the base-emitter voltage (Vbe) of the transistor and this will alter the DC biasing conditions. Capacitor C1 and primary of the transformer L1 forms the tank circuit. C2 is the by- capacitor for resistor R2.
Working of the tuned collector oscillator. When the power supply is switched ON, the transistor starts conducting and the capacitor C1 starts charging. When the capacitor is fully charged, it starts discharging through the primary coil L1. When the capacitor is fully discharged, the energy stored in the capacitor as electrostatic eld will be moved to the inductor as electromagnetic eld. Now there will be no more voltage across the capacitor to keep the current through the coil starts to collapse. In order to oppose this the coil L1 generates a back emf (by electromagnetic induction) and this
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back emf charges the capacitor again. Then capacitor discharges through the coil and the cycle is repeated. This charging and discharging sets up a series of oscillations in the tank circuit. The oscillations produced in the tank circuit is fed back to the base of transistor Q1 by the secondary coil by inductive coupling. The amount of can be adjusted by varying the turns ratio of the transformer. The winding direction of the secondary coil (L2) is in such a way that the voltage across it will be 180° phase opposite to that of the voltage across primary (L1). Thus the circuit produces a phase shift of 180° and the transistor alone produces a phase shift of another 180°. As a result a total phase shift of 360° is
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obtained between input and output and it is a very necessary condition for positive and sustained oscillations.
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The collector current of the transistor compensates the energy lost in the tank circuit. This is done by taking a small amount of voltage from the tank circuit, amplifying it and applying it back to the tank circuit. Capacitor C1 can be made variable in variable frequency applications.
equation: F = 1/[2π√(L1C1)] Where F is the frequency of oscillation. L1 is the inductance of the transformer primary and C1 is the capacitance.
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4 thoughts on “Tuned Collector Oscillator” KIPROTICH RONOH SIDNEY May 29, 2013 at 12:47 am Thanks for your for updating with Tuned collector oscillation Reply
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The frequency of oscillations of the tank circuit can be expressed using the following
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super article, it helped me a lot. A big thanx to u
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Home / Oscillators / Tuned Collector Oscillator
Tuned Collector Oscillator Last Updated on February 4, 2014 by jojo in Oscillators with 4 Comments
Start - PDF Now Convert From Doc to PDF, PDF to Doc Simply With The Free On-line App!
Tuned collector oscillator. Tuned collector oscillation is a type of transistor LC oscillator where the tuned circuit (tank) consists of a transformer and a capacitor is connected in the collector circuit of the transistor. Tuned collector oscillator is of course the simplest and the basic type of LC oscillators. The tuned circuit connected at the collector circuit behaves like a purely resistive load at resonance and determines the oscillator frequency.The common applications of tuned collector oscillator are RF oscillator circuits, mixers, frequency demodulators, signal generators etc. The circuit diagram of a conventional tuned collector oscillator is shown in the gure below.
Circuit diagram.
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Subscribe
Categories
In the circuit diagram resistor R1 and R2 forms a voltage divider bias for the transistor. Re is the emitter resistor which is meant for thermal stability. It also limits the collector current of the transistor. Ce is the emitter by- capacitor. The job of Ce is to by- the ampli ed oscillations. If Ce is not there, the ampli ed AC oscillations will drop across Re and will add on to the base-emitter voltage (Vbe) of the transistor and this will alter the DC biasing conditions. Capacitor C1 and primary of the transformer L1 forms the tank circuit. C2 is the by- capacitor for resistor R2.
Working of the tuned collector oscillator. When the power supply is switched ON, the transistor starts conducting and the capacitor C1 starts charging. When the capacitor is fully charged, it starts discharging through the primary coil L1. When the capacitor is fully discharged, the energy stored in the capacitor as electrostatic eld will be moved to the inductor as electromagnetic eld. Now there will be no more voltage across the capacitor to keep the current through the coil starts to collapse. In order to oppose this the coil L1 generates a back emf (by electromagnetic induction) and this
http://www.circuitstoday.com/tunedcollectoroscillator
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9/7/2016
Tuned Collector Oscillator – Electronic Circuits and DiagramElectronics Projects and Design
back emf charges the capacitor again. Then capacitor discharges through the coil and the cycle is repeated. This charging and discharging sets up a series of oscillations in the tank circuit. The oscillations produced in the tank circuit is fed back to the base of transistor Q1 by the secondary coil by inductive coupling. The amount of can be adjusted by varying the turns ratio of the transformer. The winding direction of the secondary coil (L2) is in such a way that the voltage across it will be 180° phase opposite to that of the voltage across primary (L1). Thus the circuit produces a phase shift of 180° and the transistor alone produces a phase shift of another 180°. As a result a total phase shift of 360° is
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Cable TV Circuits
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Camera Technology
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Clipping and Clamping Circuits
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Clocking & Timer Circuits
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Conversion Circuits Counter Circuits
obtained between input and output and it is a very necessary condition for positive and sustained oscillations.
Counters Digital Electronics Education & Training
The collector current of the transistor compensates the energy lost in the tank circuit. This is done by taking a small amount of voltage from the tank circuit, amplifying it and applying it back to the tank circuit. Capacitor C1 can be made variable in variable frequency applications.
equation: F = 1/[2π√(L1C1)] Where F is the frequency of oscillation. L1 is the inductance of the transformer primary and C1 is the capacitance.
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You may also like: FM Radio jammer
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RF Circuit
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4 thoughts on “Tuned Collector Oscillator” KIPROTICH RONOH SIDNEY May 29, 2013 at 12:47 am Thanks for your for updating with Tuned collector oscillation Reply
rijun kv October 6, 2012 at 7:14 pm
(5)
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Oscillators
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Fun & Game Circuits
tuned collector oscillator
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The frequency of oscillations of the tank circuit can be expressed using the following
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super article, it helped me a lot. A big thanx to u
http://www.circuitstoday.com/tunedcollectoroscillator
2/6
9/7/2016
Tuned Collector Oscillator – Electronic Circuits and DiagramElectronics Projects and Design Reply
Relays Remote Circuits
tamilselvan.t March 31, 2010 at 4:32 am i have searched for tthe e ects of corrosion in tajmahal but i didn’t get that. BUT THERE ARE RESULTS ABOUT CORROSION IN GLASS, METALS ETC…. PLEASE THE CURRENT INFORMATION THAT I NEEDED IT WILL BE USEFUL FOR LOT OF STUDENTS AS LIKE ME
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rathinavel. December 18, 2009 at 6:03 am
Signal Conditioners
(11)
xcellent details
Signal Generators
(13)
Reply
thanks for your service Reply
Leave a Reply Your email address will not be published. Required elds are marked * Comment
Speed Controller Circuits
(1)
State space analysis
(2)
Switching Circuits
(6)
Tech News Telephone Related
(9)
Television Related
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Three phase circuits
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Timer Circuits
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Name *
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VLSI
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Latest Articles Drag and Drop IoT Project Builder myDevices partner with Arduino Analog Oscilloscopes/CRO Online Buying Guide GSM and GPRS Modem/Module – Price and Buying Guide
http://www.circuitstoday.com/tunedcollectoroscillator
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9/7/2016
Tuned Collector Oscillator – Electronic Circuits and DiagramElectronics Projects and Design How is ARM Programming Di erent? Proteus Tutorial – Using Dot Matrix Displays How to Make an LED Scrollbar Heart rate monitor with sms alert. Proteus Tutorial – Using Single and Multiple Digit Segment Displays Proteus Tutorial – Light Emitting Diode (LED) and Bar Graph Display How to Install and Setup Compiler with Development Environment for ARM7
Like Us on Facebook
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Recent Comments AB on Few LM317 voltage regulator circuits Shanjedul Hassan on Digital Code Lock using Arduino with LCD Display and De ned Mark Harder on How is ARM Programming Di erent? jojo on Burglar Alarm using Arduino and PIR Sensor- with SMS Alarm using GSM Module jojo on Burglar Alarm using Arduino and PIR Sensor- with SMS Alarm using GSM Module jojo on Burglar Alarm using Arduino and PIR Sensor- with SMS Alarm using GSM Module jojo on GSM and GPRS Modem/Module – Price and Buying Guide mohanraj on GSM and GPRS Modem/Module – Price and Buying Guide Noel on Burglar Alarm using Arduino and PIR Sensor- with SMS Alarm using GSM Module kay xaveriuz on How to Make an LED Scrollbar Karthikeyan on Digital Door Lock – based Electronic Code Lock using 8051 Guru on Digital Count Down Timer using PIC Microcontroller jane on How to Interface GSM Module to Arduino-Send and Receive SMS suresh on Digital voltmeter using ICL7107
http://www.circuitstoday.com/tunedcollectoroscillator
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9/7/2016
Tuned Collector Oscillator – Electronic Circuits and DiagramElectronics Projects and Design msdava on Car battery charger
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Popular Tags 2N2222
555 IC
circuit diagram Filter Circuits
555 timer
Digital Electronics FM transmitter
Integrated Circuits NE555 timer Tech News
8085 lab manual
Electronic Circuits
History of Electronics
Invention Stories
Oscillators Thyristors
PIC
arduino circuits
PLL
Timer IC
Light Related
Electronic Components hobby circuits
© 2015 CircuitsToday. All rights reserved.
http://www.circuitstoday.com/tunedcollectoroscillator
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