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현재위치: > 공학교육장비 > 전자공학
전자공학
Oscillators and Basic Modulators
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SIP309C Oscillators and Basic Modulators

This course covers a variety of basic RF oscillators, audio oscillators, waveshape generators, and basic AM and FM modulators. The AM/FM modulator’s overtone radiates at a frequency of 100 MHz. The course has about 40 hours of instruction.

EQUIPMENT SPECIFICATIONS
The SIP309C Panel measures 10 x 14 inches and is painted with white lines. The PCB side is masked. The Panel is divided into 16 sections as follows:

RF OSCILLATORS - PART 1

1. The Armstrong Oscillator

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Operates at 2.75 MHz

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Variety of test points and individual DC power control switches
(provided for this circuit and all circuits)

2. Hartley Oscillators, Series and Shunt Fed

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Operates at 1.2 MHz

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RF coupled output

3. The Colpitts Oscillator

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Operates at 6.2 MHz

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Transformer coupled output

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Tunable tank circuit

4. The Clapp Oscillator

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Operates at 5.5 MHz

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Adjustable feedback tuning

5. The Pierce Crystal Controlled Oscillator

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Operates at 10.7 MHz

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Serves as an RF oscillator for AM/DSB modulator

6. The Overtone Oscillator

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Operates crystal-controlled at 3.57 MHz

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Tunable tank circuit is adjusted for the 3rd and 5th harmonics

AUDIO OSCILLATORS - PART 2

7. The Phase Shift Audio Oscillator

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Operates in the audio frequency range

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Audio buffer amplifier, adjustable AF output

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Contains an FSK modulation section

8. The Wien Bridge Oscillator

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Adjustable feedback for stability

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Audio output is adjustable

9. Rectangle, Triangle, and Sine Wave VCO Oscillator

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Produces three different waveshapes

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Contains a Schmitt Trigger and Square Wave Oscillator

10. Multivibrator Circuits

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Contains monostable and astable oscillators

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Monostable circuit synchronized by astable circuit

11. Timer Oscillators Using ICs

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Monostable oscillator circuit triggered by an astable oscillator circuit

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Both oscillation and pulse generation are demonstrated

12. Crystal Oscillator with Frequency Dividers

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Operates at 4 MHz

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Uses AND circuits to divide the 4 MHz oscillator down to the audio frequency range

BASIC MODULATORS - PART 3

13. AM Modulation with DSB, Suppressed Carrier

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AM carrier suppression IC circuit

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Variable controls provided for balancing out the carrier signal

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The RF signal is provided by the 10.7 MHz Pierce Oscillator

14. Frequency Modulation

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Uses reactance modulator between 6-8 MHz, and audio cassette player

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Wien Bridge Oscillator radiates at radio frequency band and serves as audio modulator

15. Frequency Shift Keying (FSK) modulation techniques

LABORATORY MANUAL
The comprehensive Laboratory Manual includes a list of topics which are indicated by the items listed in the Equipment Specifications.

  1. A Phase Detector

  2. The Voltage Controlled Oscillator

  3. A Phase-Locked Loop Filter

  4. The Crystal Oscillator

  5. Digital Dividers

  6. Sine Wave Generation Using Digital Addition

  7. Sine Wave Generation (32 KHz) from Square Waves

  8. Generation of a Sine Wave (450 KHz) from the Hartley Oscillator

  9. Locking an Oscillator (450 KHz) Using a Synthesizer

  10. A PLL FM Detector

REQUIRED EXTRA EQUIPMENT
Power Supply Base (S300PSB)
or
Master Builder (S300B)
All equipment operates on 120/240 VAC, 50/60 Hz.

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