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User Manual for Pulse Width Modulation and Demodulation Trainer

Introduction

PS-DC-PWM is proposed to user friendly to process the experiments and the trainer had all internal features like message signal, carrier signal, power supply etc., and the trainer has online video demonstration on our website.

 

Technical Specification

  • Message Signal 1 : Frequency 500 Hz : Amplitude 0 to 5V
  • Message Signal 2 : Frequency 1 KHz : Amplitude 0 to 5V
  • Message Signal 3 : Frequency 2 KHz : Amplitude 0 to 5V
  • Carrier Signal : Frequency 8KHz, 16KHz, 32KHz, 64KHz : Amplitude 2V
  • Modulator Type : LM 311 Based (Comparator)
  • Demodulator : 4th Order LPF
  • Amplifier : Op-Amp Based
  • Supply Voltage (Board) : +12V, +5V / DC
  • Supply current : 100 mA (Minimum)
  • Input Voltage : 230 V/ 50 Hz AC
  • Interface connectors : 2mm socket

 

FEATURES

  • On-board message signal with variable amplitude
  • Three different frequency message signal
  • On Board four different frequency carrier signal
  • PWM Modulation using comparator IC
  • PWM Demodulation using Low Pass Filter
  • Amplifier using Op-Amp
  • Internal Power Supply +5V , +12V/ 500 mA
  • Number of test point to study the PWM system
  • User friendly front panel block diagram

 

Front Panel Diagram





BLOCK DIAGRAM

PWM Modulation





PWM Demodulation





EXPERIMENTAL SECTION

LIST OF EXPERIMENTS

Experiment 1:

To Study the PWM Modulation and Demodulation (64 KHz Carrier)

Experiment 2:

To Study the PWM Modulation and Demodulation (32 KHz Carrier)

Experiment 3:

To Study the PWM Modulation and Demodulation (16 KHz Carrier)

Experiment 4:

To Study the PWM Modulation and Demodulation (8 KHz Carrier)

Apparatus Requiered of Experiments

  • PWM Trainer : 1 No
  • Patch chord : 4 No’s
  • Power chord : 1 No
  • Manual : 1 No
  • CRO : 1 No

 

EXPERIMENT - 1: Pulse Width Modulation and Demodulation (64 KHz Carrier)

Aim

To study the Pulse Width modulation and Demodulation at 64KHz Carrier.

Apparatus Required

  • PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PWM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz, 16 KHz, 8 KHz) are available in carrier signal section.
  • Connect test terminal 64 KHz (P4) to P9 and view the amplified Triangular wave carrier signal at P10 on CRO.
  • Now Connect anyone message signal as an input to pulse Width Modulator (P8) using patch chord.
  • The Pulse width modulation is done and the modulated signal can be tested using CRO with test point P11.
  • Patch the modulated signal in P11 with P12 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P13 connect it with P14,and the final demodulated output is available at test point P15
  • The amplifier pot meter can be varied and verify corresponding waveform at P15
  • Note down all the wave forms.

 

Result

Thus, the Pulse Width modulation and demodulation at 64 KHz Carrier was studied.

 

EXPERIMENT - 2: Pulse Width Modulation and Demodulation (32 KHz Carrier)

Aim

To study the Pulse Width modulation and Demodulation at 32KHz Carrier.

Apparatus Required

  • PWM Trainer- 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PWM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz, 16 KHz, 8 KHz) are available in carrier signal section.
  • Connect test terminal 32 KHz (P5) to P9 and view the amplified Triangular wave carrier signal at P10 on CRO.
  • Now Connect anyone message signal as an input to pulse Width Modulator (P8) using patch chord.
  • The Pulse width modulation is done and the modulated signal can be tested using CRO with test point P11.
  • Patch the modulated signal in P11 with P12 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P13 connect it with P14,and the final demodulated output is available at test point P15
  • The amplifier pot meter can be varied and verify corresponding waveform at P15
  • Note down all the wave forms.

 

Result

Thus, the Pulse Width modulation and demodulation at 32 KHz Carrier was studied.

 

EXPERIMENT - 3: Pulse Width Modulation and Demodulation (16 KHz Carrier)

Aim

To study the Pulse Width modulation and Demodulation at 16KHz Carrier.

Apparatus Required

  • PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PWM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz, 16 KHz, 8 KHz) are available in carrier signal section.
  • Connect test terminal 16 KHz (P6) to P9 and view the amplified Triangular wave carrier signal at P10 on CRO.
  • Now Connect anyone message signal as an input to pulse Width Modulator (P8) using patch chord.
  • The Pulse width modulation is done and the modulated signal can be tested using CRO with test point P11.
  • Patch the modulated signal in P11 with P12 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P13 connect it with P14,and the final demodulated output is available at test point P15
  • The amplifier pot meter can be varied and verify corresponding waveform at P15
  • Note down all the wave forms.

 

Result

Thus, the Pulse Width modulation and demodulation at 16 KHz Carrier was studied.

EXPERIMENT - 4: Pulse Width Modulation and Demodulation (8 KHz Carrier)

Aim

To study the Pulse Width modulation and Demodulation at 8KHz Carrier.

Apparatus Required

  • PWM Trainer - 01
  • Power Chord - 01
  • Patch Chords - 04
  • CRO - 01

 

Procedure

  • Connect power chord to PWM Trainer and switch ON the Trainer.
  • Message signal with various frequencies (500Hz, 1 KHz, 2 KHz) with variable amplitude are available in message signal section.
  • Connect CRO between anyone test terminal from P1 to P3 and GND Point to view the message signal with variable amplitude on CRO.
  • A Triangular wave carrier signal at various frequencies (64 KHz, 32 KHz, 16 KHz, 8 KHz) are available in carrier signal section.
  • Connect test terminal 8 KHz (P7) to P9 and view the amplified Triangular wave carrier signal at P10 on CRO.
  • Now Connect anyone message signal as an input to pulse Width Modulator (P8) using patch chord.
  • The Pulse width modulation is done and the modulated signal can be tested using CRO with test point P11.
  • Patch the modulated signal in P11 with P12 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P13 connect it with P14,and the final demodulated output is available at test point P15
  • The amplifier pot meter can be varied and verify corresponding waveform at P15
  • Note down all the wave forms.

 

Result

Thus, the Pulse Width modulation and demodulation at 8 KHz Carrier was studied.