Module 3 . OPERATIONAL AMPLIFIER. Brainstorming Session…. What does an AMPLIFIER do?. What is an IC?. Integrated Circuits. Inside an IC. OP-Amp is an amplifier IC. What can you do with Op amps?. You can make music louder when they are used in stereo equipment.
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What does an AMPLIFIER do?
OP-AMP is a differential, voltage amplifier with high gain.
The most common op-amp is the 741 IC.
Figure 6 Dual Supply Voltages connectionMost Op Amps require dual power supply with common ground
Positive Supply (+15V) to pin7
Negative Supply (-15V) to pin4
What is the voltage between + of first battery and – of second battery?
+VIN = –VIN
(a) Comparator Circuit
(b) Comparator OutputOP AMP as a Comparator (compares 2 voltages and produces a signal to indicate which is greater)
The two basic amplifier circuits with negative feedback are:
(Note: Negative feedback is used to limit the gain)
B) Non Inverting Amplifiers
1. Voltage Follower
Figure 14 Summing Amplifier
Summing Amplifier (Adder) : the inputs are added and the sum is inverted . If all resistors are of equal value, thenVo = -(V1 + V2+ V3)
Figure 15 Inverting Op-Amp as IntegratorIntegrator (the input is integrated with respect to time)
Figure 16 Inverting Op-Amp as DifferentiatorDifferentiator (the input is differentiated with respect to time)