GOTT-DAC-100 Digital & Analog Communication Trainer (Code 100-100)

The GOTT-DAC-100 is a digital and analog communication trainer from GOTT. It covers RF oscillators and filters, analog AM and FM modulation and demodulation, digital and analog conversion, ASK, FSK, PSK, and QPSK modulation and demodulation, and pulse width modulation. Its 34 experiments are grouped into nine circuit design modules (codes 100-101 to 100-109). An optional DC Power Supply & Function Generator is available.

Key Features

• Design and implementation of RF oscillators and filters.
• Design and implementation of analog AM and FM modulation and demodulation.
• Design and implementation of digital and analog converter.
• Design and implementation of ASK and FSK modulation and demodulation.
• Design and implementation of PSK and QPSK modulation and demodulation.

Experiments Included

RF Oscillator & Second Order Filter Circuits Design (100-101)

• RF Oscillator Circuits Design
  • Experiment 1: Colpitts Oscillators Circuit (Oscillation Frequency: 1 MHz ~ 10 MHz)
  • Experiment 2: Hartley Oscillators Circuit (Oscillation Frequency: 500 kHz ~ 2 MHz)
• Second Order Filter Circuits Design
  • Experiment 1: Second Order LPF Circuit (Low-pass -3 dB Frequency: 1 kHz ~ 10 kHz)
  • Experiment 2: Second Order HPF Circuit (High-pass -3 dB Frequency: 800 Hz ~ 8 kHz)
  • Experiment 3: Second Order BPF Circuit (Center Frequency: 6 kHz; Bandwidth: 10kHz)

Amplitude Modulation & Demodulation Circuit Design (100-102)

• Amplitude Modulation Circuit Design
  • Experiment 1: Amplitude Modulation Circuit (Carrier Signal: 500 kHz ~ 3 MHz; Audio Signal Frequency: 1 kHz ~ 3 kHz)
• Amplitude Demodulation Circuit Design
  • Experiment 1: AM Diode Detection Circuit (Carrier Signal: 200 kHz ~ 300 kHz; Audio Signal Frequency: 1 kHz ~ 3 kHz)
  • Experiment 2: AM Product Detection Circuit (Carrier Signal: 500 kHz ~ 3 MHz; Audio Signal Frequency: 1 kHz ~ 3 kHz; Modulation Index: 50 %)

Frequency Modulation & Demodulation Circuit Design (100-103)

• Frequency Modulation Circuit Design
  • Experiment 1: The Specification Measurement of MC1648 VCO (Oscillation Frequency: 2 MHz ~ 3 MHz)
  • Experiment 2: MC1648 FM Circuit (Carrier Signal: 2.8 MHz; Audio Signal Frequency: 3 kHz ~ 8 kHz)
  • Experiment 3: The Specification Measurement of LM566 VCO (Oscillation Frequency: 1 kHz ~ 30 kHz)
  • Experiment 4: LM566 FM Circuit (Carrier Signal: 20 kHz; Audio Signal Frequency: 1 kHz ~ 5 kHz)
• Frequency Demodulation Circuit Design
  • Experiment 1: The Specification Measurement of LM565 PLL (Nature Frequency: 0.6 kHz ~ 77 kHz; Phase Locked Range: 1.1 kHz ~ 3.9 kHz; Phase Caught Range: 1.2 kHz ~ 3.8 kHz)
  • Experiment 2: The Specification of Voltage and Frequency for LM565 PLL (Input Signal Frequency: 0.5 kHz ~ 23.5 kHz; Output Voltage: 3V ~ 4.5V)
  • Experiment 3: LM565 Phase Locked Loop Circuit (Nature Frequency: 20 kHz; Audio Signal Frequency: 1kHz ~ 3 kHz)
  • Experiment 4: FM to AM Discriminator Circuit (Nature Frequency: 2 MHz; Audio Signal Frequency: 1 kHz ~ 3 kHz)

Analog to Digital & Digital to Analog Converter Circuit Design (100-104)

• Analog to Digital Converter Circuit Design
  • Experiment 1: ADC0804 ADC Circuit (Resolution: 8 bits; Analog Input Voltage: 0V ~ 5V)
  • Experiment 2: ADC0809 ADC Circuit (Resolution: 8 bits; analog Input Voltage: 0V ~ 5V; Clock Frequency: 120 kHz)
• Digital to Analog Converter Circuit Design
  • Experiment 1: Unipolar DAC 0800 DAC Circuit (Digital Input: 8 bits; Analog Output: 0V ~ 5V; Step Value: 0.019V)
  • Experiment 2: Bipolar DAC 0800 DAC Circuit (Digital Input: 8 bits; Analog Output: -5V ~ 5V; Step Value: 0.038V)

Pulse Width Modulation & Demodulation Circuit Design (100-105)

• Pulse Width Modulation Circuit Design
  • Experiment 1: UA741 PWM Circuit (Carrier Signal: 1.5 kHz ~ 2 kHz; Audio Signal Frequency: 500Hz)
  • Experiment 2: LM566 PWM Circuit (Carrier Signal: 5 kHz ~ 10 kHz; Audio Signal Frequency: 1 kHz)
• Pulse Width Demodulation Circuit Design
  • Experiment 1: PWM Demodulation Circuit (Carrier Signal: 5 kHz ~ 6 kHz; Audio Signal Frequency: 500 Hz ~ 700 Hz)

Amplitude-Shift Keying Modulation & Demodulation Circuit Design (100-106)

• Amplitude-Shift Keying Modulation Circuit Design
  • Experiment 1: ASK Modulation Circuit (Carrier Signal: 20 kHz ~ 100 kHz; Modulation Signal Frequency: 1 kHz ~ 10 kHz)
• Amplitude-Shift Keying Demodulation Circuit Design
  • Experiment 1: ASK Non-coherent Detection Circuit (Carrier Signal: 20 kHz ~ 100 kHz; Modulation Signal Frequency: 1 kHz ~ 10 kHz)
  • Experiment 2: ASK Coherent Detection Circuit (Carrier Signal: 20 kHz ~ 100 kHz; Modulation Signal Frequency: 1 kHz ~ 10 kHz)

Frequency-Shift Keying Modulation & Demodulation Circuit Design (100-107)

• Frequency-Shift Keying Modulation Circuit Design
  • Experiment 1: FSK Modulation Circuit (Space Signal: 1370 Hz; Mark Signal: 870 Hz; Data Signal: 200 Hz ~ 5 kHz)
• Frequency-Shift Keying Demodulation Circuit Design
  • Experiment 1: FSK Demodulation Circuit (Space Signal: 1370 Hz; Mark Signal: 870 Hz; Data Signal: 200 Hz ~ 5 kHz)

Phase-Shift Keying Modulation & Demodulation Circuit Design (100-108)

• Phase-Shift Keying Modulation Circuit Design
  • Experiment 1: PSK Modulation Circuit (Carrier Signal: 100 kHz; Data Rate: 200 bps; Data Signal: 100 Hz ~ 1kHz)
• Phase-Shift Keying Demodulation Circuit Design
  • Experiment 1: PSK Demodulation Circuit (Carrier Signal: 100 kHz; Data Rate: 400 bps ~ 1000 bps; Data Signal: 100 Hz ~ 1kHz)

QPSK Modulation & Demodulation Circuit Design (100-109)

• QPSK Modulation Circuit Design
  • Experiment 1: Bit-splitter Circuit (Data Rate: 100 bps ~ 1000 bps)
  • Experiment 2: QPSK Modulation Circuit (Carrier Signal: 20 kHz; Data Rate: 1000bps)
• QPSK Demodulation Circuit Design
  • Experiment 1: Signal-square and PLL Circuit (Carrier Signal: 20 kHz; Data Rate: 1000 bps)
  • Experiment 2: QPSK Demodulation Circuit (Carrier Signal: 20 kHz; Data Rate: 1000 bps)