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university:courses:electronics:electronics-lab-variable-gain-amplifier [26 Mar 2018 11:43] – add Voltage Controlled Amplifier using transistor Antoniu Miclausuniversity:courses:electronics:electronics-lab-variable-gain-amplifier [26 Mar 2018 12:09] – add Variable Gain Inverting Amplifier using potetiometer Antoniu Miclaus
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 The output signal varies between two values, determined by the two gain settings, based on the state of the controlled transistor. The output signal varies between two values, determined by the two gain settings, based on the state of the controlled transistor.
 +
 +===== Variable Gain Inverting Amplifier using potetiometer =====
 +
 +==== Background ====
 +
 +Consider the circuit schematic presented in Figure 4.
 +
 +<WRAP centeralign> {{:university:courses:electronics:var_gain_amp_pot2-sch.png?500|}} </WRAP>
 +
 +<WRAP centeralign> Figure 4. Variable Gain Inverting Amplifier using potetiometer </WRAP>
 +
 +On the inverting amplifier a potentiometer is used to control manually the output voltage, replacing the standard feedback resistor.
 +
 +==== Hardware Setup ====
 +
 +Build the following breadboard circuit for the voltage-controlled amplifier using transistors.
 +
 +<WRAP centeralign> {{:university:courses:electronics:var_gain_amp_pot2-bb.png|}} </WRAP>
 +
 +<WRAP centeralign> Figure 5. Variable Gain 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.
 +
 +An animated plot is presented in Figure 6.
 +
 +<WRAP centeralign> {{:university:courses:electronics:var_gain_amp_pot2-wav.gif|}} </WRAP>
 +
 +<WRAP centeralign> Figure 6. Variable Gain Inverting Amplifier using potetiometer - waveforms </WRAP>
  
university/courses/electronics/electronics-lab-variable-gain-amplifier.txt · Last modified: 03 Jan 2021 22:21 by Robin Getz

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