Day 22 05/19/2015

Class Note

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Mason's tiny little power lab

The result is above which means DC is not exactly twice of AC

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Note

Day 21 05/14/2015 Inverting Voltage Amplifier & Op Relaxation Oscillator

Class Note

Nodal analysis and we all know at inverting voltage amplifier the node at (-) & (+) is 0

Key point at star ~!!

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Inverting Voltage Amplifier

In this lab we were required to build an inverting voltage amplifier using an op-amp

We then asked to calculate the theoretical voltage gain and the phase shift.

In this lab we were using R=10k C=10nF sinusoidal signal amplitude 2V and offset 0V with 

frequency: 100 Hz, 1kHz, and 5kHz

100Hz Vin 2.01 Vout 1.704

1kHz Vin 2.01 Vout 0.312

5kHz Vin 2.01 Vout 0.312

We calculate the Amp gain By Vout/ Vin

Phase Shift by Delta T / T(period) * 360

The result of this lab is frequency increase will decrease the Amp gain because Vout decrease as frequency increase.

Unlike the Amp gain, the phase shift is increase when frequency increase but quickly reach a shift of maximum.

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Setup of Circuit

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Our next lab required us to build an op-amp relaxation oscillator and manipulate the resistance to obtain a frequency of 178

we use digit number 155 and observe 178 

We then calculate period then plug into the formula theat period = 2RCln[(1+B)/(1-B)]

then we assume R1=R2=1k ohm

Then we solved R = 29428 ohm

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Second Lab set up

Day 20 05/12/2015 Phasors:Passive RL Circuit Response

Class Note

This one is the nodal analysis

this one is mesh analysis

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Phasor:Passive RL Circuir Response

In Pre-Lab we calculate the phasors shift and frequency

The Result end up not doable because the frequency is way too high

Next we keep our circuit setup

Then change to W= 10kHz and 20kHz

then we have the result above

At this result we solved the phase shift at

10 kHz = 0.77

20 kHz = 0.73

Another way:

For 10 kHz we observe amplitude Vin = 1.002 V at -442 us ; amplitude In = 1.008 A at -416 us

delta T b/w peak = 26us

Period V = 100 us

Period I = 99.996 us

We then solved by delta T/ Period * 360

Period and Amplitude is observed here

The lab today we were able to find the amplitude gain by comparing the phasors representing by Vin and Vout.

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Class Note

Day No Lab 05/05/2015

Didn't take the picture so I go find one on google instead

This is an oscilloscope and we can measure any waves by use of a transducer.

This is a picture of how oscilloscope work 

In this oscilloscope the graph on the screen is appear by shooting electrons on the screen after passing through different plate with positioned vertical and horizontal. Each is one positive and one negative. The graph of the electron can be produced by changing these plates charge to create the graph depends on the voltage .

Day 19 05/07/2015 Impedance

Class Note

Graph of Resistor and Inductor and Capacitor relate to current.

Key: change capacitor and inductor to the ohm's format

Zc=1/jwc

ZL=jwL

In the pre-lab above we calculate the Zth from a) ~ c).

We use 47Ω in each circuit and 1uH for inductor and 0.1uF for capacitor. These resistor circuit we change all elements to phaser when AC is supplied. Under the inductor and capacitor both that voltage leads the current by 90 degree. Each circuit we supplied an AC 2V with frequency 1kHz, 5kHz, and 10kHz.

1kHz

5kHz

On the first circuit we notice the voltage and current didn't change any when frequency

On second circuit we notice the voltage is increase when frequency increasing but the current decrease when frequency increase.

On third circuit we notice the voltage decrease a little when frequency increase and current increase at the same ratio as frequency increase.

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Circuit Setpup

a)

b)

c)

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At here we try to match the experimental value to the theoretical value by calculate the Z and the result pretty close to the theoretical value.

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Class Note

Day 18 04/30/2015 RLC Circuit Response (data error)

Lab RLC Circuit Response 

In this lab we build the circuit using R1 = 1.1 ohm and R2 =47 ohm, 10uF capacitor, and 1uH Inductor. This circuit build as R2 and inductor in series which is parallel to R1 and capacitor.

After we build the circuit we send the function voltage through the RLC circuit and measure the time different between the peak

In Pre-Lab

 we know the damping ratio by knowing  α = 1/2RC ω=1/(LC)^1/2  we can then calculate the damping ratio = α/ω

In Lab

Since the capacitor and inductor in parallel. The damping ratio can be calculate by knoing the X% differentby subtracting the voltage changing ratio of times the n is equal to -0.118 which is off a little lol