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university:courses:electronics:electronics-lab-pulse-width-modulation [05 Mar 2019 12:58]
Antoniu Miclaus [Going Further with the Lab]
university:courses:electronics:electronics-lab-pulse-width-modulation [03 Jan 2021 22:21]
Robin Getz fix links
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 Consider the circuit in Figure 1. Consider the circuit in Figure 1.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​pwm_carrier-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​pwm_carrier.png?​400 |}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 1. PWM Principle of operation </​WRAP>​ <WRAP centeralign>​ Figure 1. PWM Principle of operation </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as the carrier signal providing a 4V amplitude, 2.5V offset, 1 kHz triangle wave excitation to the circuit. Use the second waveform generator as the modulation signal with 3V amplitude, 2.5V offset, 50Hz sine wave.+Use the first waveform generator as the carrier signal providing a 4V amplitude ​peak-to-peak, 2.5V offset, 1 kHz triangle wave excitation to the circuit. Use the second waveform generator as the modulation signal with 3V amplitude ​peak-to-peak, 2.5V offset, 50Hz sine wave.
  
 Supply the op amp with +5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2 . Supply the op amp with +5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2 .
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 Consider the circuit in Figure 5. Consider the circuit in Figure 5.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​pwm_ref_voltage-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​pwm_dc_modulation1_ltspice.png?400 |}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 5. Pulse Width Control using a DC modulation Voltage </​WRAP>​ <WRAP centeralign>​ Figure 5. Pulse Width Control using a DC modulation Voltage </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as source Vin to provide a 5V amplitude, 1 kHz triangle wave excitation to the circuit. Use the second waveform generator as constant voltage source with 5V amplitude.+Use the first waveform generator as source Vin to provide a 5V amplitude ​peak-to-peak, 1 kHz triangle wave excitation to the circuit. Use the second waveform generator as constant voltage source with 5V amplitude ​peak-to-peak.
 Supply the op amp to +5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2. Supply the op amp to +5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2.
  
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 Consider the circuit in Figure 8. Consider the circuit in Figure 8.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​pwm_multivibr-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​pwm_astable_multivibr.png?400 |}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 8. PWM with Astable Multivibrator </​WRAP>​ <WRAP centeralign>​ Figure 8. PWM with Astable Multivibrator </​WRAP>​
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 Consider the circuit presented in Figure 11. Consider the circuit presented in Figure 11.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​pwm_dc_multivibr-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​pwm_dc_multivibr.png?​400 |}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 11. Adjusting the duty cycle for PWM with Multivibrator</​WRAP>​ <WRAP centeralign>​ Figure 11. Adjusting the duty cycle for PWM with Multivibrator</​WRAP>​
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 <WRAP round download>​ <WRAP round download>​
 **Lab Resources:​** **Lab Resources:​**
-  * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​pwm_lab_bb | pwm_lab_bb]] +  * Fritzing files: [[downgit>education_tools/​tree/​master/​m2k/​fritzing/​pwm_lab_bb | pwm_lab_bb]] 
-  * LTspice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​pwm_lab_ltspice | pwm_lab_ltspice]]+  * LTspice files: [[downgit>education_tools/​tree/​master/​m2k/​ltspice/​pwm_lab_ltspice | pwm_lab_ltspice]]
 </​WRAP>​ </​WRAP>​
 ===== Further Reading ===== ===== Further Reading =====
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   * [[https://​en.wikipedia.org/​wiki/​Pulse-width_modulation|Pulse-width modulation]]   * [[https://​en.wikipedia.org/​wiki/​Pulse-width_modulation|Pulse-width modulation]]
   * [[university:​courses:​alm1k:​alm-lab-pwm|Activity:​ Pulse Width Modulation]]   * [[university:​courses:​alm1k:​alm-lab-pwm|Activity:​ Pulse Width Modulation]]
-  * [[http://​www.analog.com/​en/​analog-dialogue/​articles/​how-to-control-fan-speed.html|Why and How to Control Fan Speed for Cooling Electronic Equipment]]+  * [[adi>en/​analog-dialogue/​articles/​how-to-control-fan-speed.html|Why and How to Control Fan Speed for Cooling Electronic Equipment]]
  
 **Return to Lab Activity [[university:​courses:​electronics:​labs|Table of Contents]]** **Return to Lab Activity [[university:​courses:​electronics:​labs|Table of Contents]]**
  
university/courses/electronics/electronics-lab-pulse-width-modulation.txt · Last modified: 27 Jan 2021 22:36 by Robin Getz