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university:courses:electronics:electronics-lab-pulse-width-modulation [04 May 2018 11:07] – changes based on review Antoniu Miclausuniversity:courses:electronics:electronics-lab-pulse-width-modulation [27 Jan 2021 22:36] (current) – use wp> interwiki links Robin Getz
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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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 Build the above discussed circuits using AD8561 from the Parts Kit and discuss any noticeable changes of the circuit behavior and the input/output signals.  Build the above discussed circuits using AD8561 from the Parts Kit and discuss any noticeable changes of the circuit behavior and the input/output signals. 
  
 +<WRAP round download>
 +**Lab Resources:**
 +  * Fritzing files: [[downgit>education_tools/tree/master/m2k/fritzing/pwm_lab_bb | pwm_lab_bb]]
 +  * LTspice files: [[downgit>education_tools/tree/master/m2k/ltspice/pwm_lab_ltspice | pwm_lab_ltspice]]
 +</WRAP>
 ===== Further Reading ===== ===== Further Reading =====
  
 Some additional resources: Some additional resources:
-  * [[https://en.wikipedia.org/wiki/Pulse-width_modulation|Pulse-width modulation]]+  * [[wp>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

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