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The only physical difference between the TL072 and the TL071 is that the TL071 only contains one operational amplifier (op amp).
Both of these op amps perform the same basic function although it is important to note that this op amp contains offset null terminals. For a little bit of background theory we should remember that an op amp is a differential amplifier, meaning that it amplifies the difference in voltage between the two input terminals. The output should be 0V when there is no difference in voltage between the terminals.
This is great in theory, but in reality, the output is 0V when the inputs only differ by a small amount which we call the input offset voltage.
If you want to make the voltages exactly equal you need to apply the same voltage to both terminals and connect a variable resistor to one terminal so that you can change the resistance until the output is 0V.
Have a go at building the circuit in Fig 1 and get it to work. You might then wish to experiment further with the circuit – perhaps you could attach it to an oscilloscope and see what is happening in the circuit. Use Fig 2 (pin diagram) and Fig 3 (breadboard layout) to help with your experiments.
It may also be worth doing some research into Junction Gate-Field Effect Transistors (JFET’s) as this is contained inside the TL071 - it will give you some further knowledge of the subject and help your understanding.
Both of these op amps perform the same basic function although it is important to note that this op amp contains offset null terminals. For a little bit of background theory we should remember that an op amp is a differential amplifier, meaning that it amplifies the difference in voltage between the two input terminals. The output should be 0V when there is no difference in voltage between the terminals.
This is great in theory, but in reality, the output is 0V when the inputs only differ by a small amount which we call the input offset voltage.
If you want to make the voltages exactly equal you need to apply the same voltage to both terminals and connect a variable resistor to one terminal so that you can change the resistance until the output is 0V.
Have a go at building the circuit in Fig 1 and get it to work. You might then wish to experiment further with the circuit – perhaps you could attach it to an oscilloscope and see what is happening in the circuit. Use Fig 2 (pin diagram) and Fig 3 (breadboard layout) to help with your experiments.
It may also be worth doing some research into Junction Gate-Field Effect Transistors (JFET’s) as this is contained inside the TL071 - it will give you some further knowledge of the subject and help your understanding.
Fig 1
In addition to a Prototype board (Breadboard), wire for connections and a power source, you will need the following components to build this circuit:
1 x 100KΩ Fixed Resistor1 x 100KΩ Preset Potentiometer1 x miniature LDR1 x TL071 Operational Amplifier IC (Data Sheet)1 x LED
1 x 100KΩ Fixed Resistor1 x 100KΩ Preset Potentiometer1 x miniature LDR1 x TL071 Operational Amplifier IC (Data Sheet)1 x LED
Fig 3
Important - DO NOT connect the Offset pins to ground, otherwise you will blow the IC!
TL071.mp4
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