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User Manual for Pulse Amplitude Modulation and Demodulation Trainer

Introduction

PS-DC-PAM 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 5V
  • Modulator Type : 74 HC 4053 Based (Switching)
  • Sampling Output : Sample/Hold : Natural Sampling : Flat Top Sampling
  • 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
  • PAM Modulation using switching IC
  • PAM Demodulation using Low Pass Filter
  • Amplifier using Op-Amp
  • Internal Power Supply +5V , +12V/ 500 mA
  • Number of test point to study the PAM system
  • User friendly front panel block diagram

 

Front Panel Diagram





BLOCK DIAGRAM

PAM Modulation



PAM Demodulation



EXPERIMENTAL SECTION

List of Experiments

Experiment 1:

To Study the PAM Modulation and Demodulation (Sample & Hold)

Experiment 2:

To Study the PAM Modulation and Demodulation (Natural Sampling)

Experiment 3:

To Study the PAM Modulation and Demodulation (Flat Top Sampling)

Apparatus Requiered of Experiments

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

 

EXPERIMENT - 1: Pulse Amplitude Modulation and Demodulation (Sample and Hold)

 

Aim

To study the Pulse Amplitude Modulation and Demodulation

Apparatus Required

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

 

Procedure

  • Connect power chord to PAM 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.
  • Square wave carrier signals at various frequencies (64 KHz, 32 KHz, 16 KHz, and 8 KHz) are available in carrier signal section.
  • Connect CRO between anyone test terminal from P4 to P7 and GND Point to view the square wave carrier signal on CRO.
  • Now Connect anyone message signal and carrier signal as an input to Pulse Amplitude Modulator (P8 and P9) using patch chord.
  • The PAM is done and the modulated signal (Sample/Hold) can be tested using CRO with test point P10.
  • Patch the modulated signal in P10 with P13 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P14 and connects it with P15 point.
  • The final demodulated output is available at test point P16 and varies the pot meter to get amplified output.

 

Result

Thus, the Pulse Amplitude Modulation and Demodulation using Sample and Hold method was studied.

 

EXPERIMENT - 2: Pulse Amplitude Modulation and Demodulation (Natural Sampling)

Aim

To study the Pulse Amplitude Modulation and Demodulation in Natural Sampling

Apparatus Required

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

 

Procedure

  • Connect power chord to PAM 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.
  • Square wave carrier signals at various frequencies (64 KHz, 32 KHz, 16 KHz, and 8 KHz) are available in carrier signal section.
  • Connect CRO between anyone test terminal from P4 to P7 and GND Point to view the square wave carrier signal on CRO.
  • Now Connect anyone message signal and carrier signal as an input to Pulse Amplitude Modulator (P8 and P9) using patch chord.
  • The PAM is done and the modulated signal (Natural Sampling) can be tested using CRO with test point P11.
  • Patch the modulated signal in P11 with P13 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P14 and connects it with P15 point.
  • The final demodulated output is available at test point P16 and varies the pot meter to get amplified output.

 

Result

Thus, the Pulse Amplitude Modulation and Demodulation in Natural Sampling was studied.

 

EXPERIMENT - 3: Pulse Amplitude Modulation and Demodulation (Flat Top Sampling)

Aim

To study the Pulse Amplitude Modulation and Demodulation in Flat Top Sampling.

Apparatus Required

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

 

Procedure

  • Connect power chord to PAM 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.
  • Square wave carrier signals at various frequencies (64 KHz, 32 KHz, 16 KHz, and 8 KHz) are available in carrier signal section.
  • Connect CRO between anyone test terminal from P4 to P7 and GND Point to view the square wave carrier signal on CRO.
  • Now Connect anyone message signal and carrier signal as an input to Pulse Amplitude Modulator (P8 and P9) using patch chord.
  • The PAM is done and the modulated signal (Flat Top Sampling) can be tested using CRO with test point P12.
  • Patch the modulated signal in P12 with P13 in the demodulator section as a low pass filter input.
  • The filtered output is available at test Point P14 and connects it with P15 point.
  • The final demodulated output is available at test point P16 and varies the pot meter to get amplified output.

 

Result

Thus, the Pulse Amplitude modulation and demodulation in Flat Top Sampling was studied.