Under the Group drop-down menu, select Analog. 0% 50% 100% 3.3 Open the Component Database. R3 10ka 0 % Key=A хмм1 Figure 2: Potentiometer Resistance Measurement and measure the resistance of the potentiometer at 0%, 50%, Set the Multimeter to measure and 100% of its total resistance. It should look something like the following. 3.2 Use the Multimeter to measure the resistance from the 'arrowed' input to the bottom-most input. Under the Component list, select the 100k potentiometer. Under the Family list, select Potentiometer. Under the Group drop-down menu, select Basic. The Multisim simulation will help you understand how this works, 3.1 Open the Component Database. The gain is controlled using a potentiometer as the feedback resistor Ry. This circuit is often used as a volume control. In the lab you will be constructing an adjustable-gain LM741 Inverting Amplifier configuration. 2.3 We will be using the 741 in an "inverting amplifier mode." R ww 0 A R ww 1 0 V + + vi Figure 1: Inverting Op-Amp Configuration where the Transfer Function (gain) is given by Vout Vin Rf 2.4 More resources on this econfiguration may be found here. 2.2 Take notice of the section on the Internal circuitry of 741-type op-amp. Understand the Functionality of an Op-Amp 2.1 Read this overview of Op-Amps. What is the function of cach pin? LM741 Pinout Diagram NC 8 nVertiog mfut 2 Dut Put Non-Imverting nfut offset MutL 5 4 1.2 What is the recommended nominal (NOM) Supply Voltage for any of the LM741 series Op-Amps (page 4)? 1.3 From the Electrical Characteristics for the LM741 Op-Amp, what is the typical input resistance?Ģ. (On page 7 of the datasheet you can see the internal structure of the Op-Amp which is quite interesting.) 1.1 Fill in the pinout diagram. The LM741 Op-Amp Find and download a datasheet for theLM741 Use the datasheet to answer the following questions.
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