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university:courses:electronics:electronics-lab-variable-gain-amplifier [26 Mar 2018 12:09]
Antoniu Miclaus add Variable Gain Inverting Amplifier using potetiometer
university:courses:electronics:electronics-lab-variable-gain-amplifier [26 Mar 2018 13:30]
Antoniu Miclaus add Variable Gain Inverting/Non-Inverting Amplifier using potetiometer
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 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, 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.
  
-An animated plot is presented in Figure 6.+By varying the value of the potentiometer,​ an animated plot is presented in Figure 6.
  
 <WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot2-wav.gif|}} </​WRAP>​ <WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot2-wav.gif|}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 6. Variable Gain Inverting Amplifier using potetiometer - waveforms </​WRAP>​ <WRAP centeralign>​ Figure 6. Variable Gain Inverting Amplifier using potetiometer - waveforms </​WRAP>​
 +
 +Using this type of configuration,​ the output is inverted and amplified based on the feedback resistance value.
 +
 +===== Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer =====
 +
 +==== Background ====
 +
 +Consider the circuit schematic presented in Figure 7.
 +
 +<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot-sch.png?​500|}} </​WRAP>​
 +
 +<WRAP centeralign>​ Figure 7. Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer </​WRAP>​
 +
 +In this amplifier configuration a potentiometer is used to control manually the output voltage, being able to invert the input by adjusting properly the potentiometer.
 +
 +==== Hardware Setup ====
 +
 +Build the following breadboard circuit for the voltage-controlled amplifier using transistors.
 +
 +<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot-bb.png|}} </​WRAP>​
 +
 +<WRAP centeralign>​ Figure 8. Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer - breadboard circuit </​WRAP>​
 +
 +==== 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.
 +
 +By varying the value of the potentiometer,​ an animated plot is presented in Figure 9.
 +
 +<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot-wav.gif|}} </​WRAP>​
 +
 +<WRAP centeralign>​ Figure 9. Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer - waveforms </​WRAP>​
 +
 +Using this configuration,​ the output is amplified varying between +-Vin.
  
university/courses/electronics/electronics-lab-variable-gain-amplifier.txt · Last modified: 03 Jan 2021 22:21 by Robin Getz