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university:courses:electronics:electronics-lab-variable-gain-amplifier [26 Oct 2018 13:12]
amiclaus [Further Reading] add LTSpice files
university:courses:electronics:electronics-lab-variable-gain-amplifier [23 Aug 2019 15:14]
amiclaus
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 Consider the circuit schematic presented in Figure 1. Consider the circuit schematic presented in Figure 1.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_crl-sch.png|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​vctrl_amp_transistor.png|}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 1. Voltage control using transistor </​WRAP>​ <WRAP centeralign>​ Figure 1. Voltage control using transistor </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as source Vin to provide a 2V amplitude, 1 kHz sine wave excitation to the circuit. Use the second waveform generator for controlling the transistor, providing a 2V amplitude, 1Hz square wave excitation. 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.+Use the first waveform generator as source Vin to provide a 2V amplitude ​peak-to-peak, 1 kHz sine wave excitation to the circuit. Use the second waveform generator for controlling the transistor, providing a 2V amplitude, 1Hz square wave excitation. 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.
  
 An animated plot is presented in Figure 3. An animated plot is presented in Figure 3.
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 Consider the circuit schematic presented in Figure 4. Consider the circuit schematic presented in Figure 4.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot2-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​var_g_invert_amp_pot.png|}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 4. Variable Gain Inverting Amplifier using potetiometer </​WRAP>​ <WRAP centeralign>​ Figure 4. Variable Gain Inverting Amplifier using potetiometer </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as source Vin to provide a 2V amplitude, 1 kHz sine wave excitation to the circuit. ​ 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.+Use the first waveform generator as source Vin to provide a 2V amplitude ​peak-to-peak, 1 kHz sine wave excitation to the circuit. ​ 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.
  
 By varying the value of the potentiometer,​ an animated plot is presented in Figure 6. By varying the value of the potentiometer,​ an animated plot is presented in Figure 6.
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 Consider the circuit schematic presented in Figure 7. Consider the circuit schematic presented in Figure 7.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​var_gain_inv_noninv.png|}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 7. Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer </​WRAP>​ <WRAP centeralign>​ Figure 7. Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as source Vin to provide a 2V amplitude, 1 kHz sine wave excitation to the circuit. ​ 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.+Use the first waveform generator as source Vin to provide a 2V amplitude ​peak-to-peak, 1 kHz sine wave excitation to the circuit. ​ 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.
  
 By varying the value of the potentiometer,​ an animated plot is presented in Figure 9. By varying the value of the potentiometer,​ an animated plot is presented in Figure 9.
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 ===== Further Reading ===== ===== Further Reading =====
  
 +<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/​var_gain_amp_bb | var_gain_amp_bb]]   * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​var_gain_amp_bb | var_gain_amp_bb]]
 +  * LTspice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​var_gain_amp_ltspice | var_gain_amp_ltspice]]
 +</​WRAP>​
  
 Some additional resources: Some additional resources:
university/courses/electronics/electronics-lab-variable-gain-amplifier.txt · Last modified: 23 Aug 2019 15:14 by amiclaus