lab03_writeup - Tam Wilson Chi Hang(G00621273 ENGR 261 SP08...

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Unformatted text preview: Tam, Wilson Chi Hang (G00621273) ENGR 261 SP08 10/Mar/2008 Experiment #3: Controlled Voltage Sources Introduction: We are to built and analyze simple circuits with a controlled voltage sources. We will make use of the operational amplifier (op-amp). We will be using the 741 op-amp in a dual in-line package 8 (DIP-8) forms with two resistors to see whether the op-amp behaves like a controlled voltage source. We first will use MultiSIM to construct the circuit to see how it behaves virtually. Then we will construct the corresponding circuit to see whether the op-amp behaves like a voltage controlled voltage source by plotting its magnitude against the output voltage. Once we find out the multiplier value, we then we will test to see whether the theory holds by testing load resistors in a range from 0 Ω to 10k Ω to see if it again behaves like a controlled voltage source. Theory: We will be learning the characteristics and behaviors of a 741 op-amp. We will be using a 741 op-amp for this experiment and to see whether the output voltage matches the theoretical value and the measured value, as the value should match. We will also be learning how the pin setup of the 741 op-amp. We then will use a series of R L to see whether the op-amp behaves like a controlled voltage source or not. Operational Amplifiers : It is a solid-state device that is capable of sensing and amplifying DC and AC input signals. A typical op-amp consists of three basic circuits: 1.) A high-input impedance differential amplifier 2.) A high-gain amplifier 3.) A low-impedance output amplifier It requires a positive and a negative power supply externally to power the op-amp as follows: Fig 1: Basic op-amp with external power supply attached, and sharing a common ground. Tam, Wilson Chi Hang (G00621273) ENGR 261 SP08 10/Mar/2008 The most important characteristics of an op-amp are: 1.) Very high input impedance, which produces negligible currents at inputs 2.) Very high open-loop gain 3.) Very low output impedance, as not to affect the output of the amplifier by loading. The op-amp that we will be using for this lab is the 8-pin mini-DIP package. Figure 2: Typical 8- pin “DIP” op-amp IC pin layout Pin 1: Balance (no input) Pin 2: Input (Negative) Pin 3: Input (Positive) Pin 4: Negative External Power to operate the op-amp Pin 5: Balance (no input) Pin 6: Output Pin 7: Positive External Power to operate the op-amp Pin 8: No Connection Tam, Wilson Chi Hang (G00621273) ENGR 261 SP08 10/Mar/2008 For this lab, we will be connecting: 1.) ? ?¡ = ??? (2 10 3 ? ) Source to Pin 3 of the op-amp. 2.) Negative 9V to Pin 4. 3.) Positive 9V to Pin 7. 4.) The first 2k Ω resistor and the other 2k Ω resistor in series to Pin 2 Materials needed: 1.) AC Voltage Source that can produce a value of ?...
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lab03_writeup - Tam Wilson Chi Hang(G00621273 ENGR 261 SP08...

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