# CMOY Headphone Project Electronic Lab Phys 318

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1 Project Overview There are two kinds of circuits that need to be built for the headphone amplifier project. ) A power circuit 2) Two amplifier circuits You will build one of each of these circuits on a breadboard and test it before assembling the circuit on the printed circuit board. Since the two amplifier circuits are identical, you will only need to put one of these on the breadboard. Project Schedule Week Thursday April Thursday April 8 Thursday April 25 Thursday May 2 Wednesday May 8, 5:00 PM Activity Breadboard and test the power circuit. Breadboard and begin testing the amplifier circuit. Homework: Derive an equation for the amplifier circuit Finish testing the amplifier circuit Derive an equation for the amplifier circuit. Practice soldering (if time) Homework: Rough draft of paper due next week. Practice soldering. Assemble the circuit on the circuit board and put it in its box. Draft of paper is due. Assembly Instructions at: Lab Practical; draft returned Final Draft of report If your first draft is not turned in on time, you will not get any feedback and you will loose one half letter grade on your final report. If your final report is late you will lose one letter grade per day it is late.

2 The power circuit Most operational amplifiers work off of +/- power supplies relative to a ground. The amplifier that we have chosen will run off of a wide range of voltages: anywhere from +/- 2.5 to +/-8V. We are going to use a single 9 Volt battery and turn it into a +/- 4.5 V power supply using the circuit shown below. 9V SW RLED C 3 U2 2 C4 C4 +4.5V U2= TLE Top view SW is a switch. -4.5V RLED is a 24.3kΩ resistor to limit the current through the LED. The diode is a blue LED that turns on when you close the switch, so you know the circuit is on. The direction of the LED matters! Be careful when you wire it. There is one capacitor labeled C. It is 470µF, and it is an electrolytic capacitor. This means that it is polarized and it matters which way you put it in the circuit. If you put it in backwards, it will explode. Capacitors C4 are the very small yellow ones. These are 0.µF ceramic caps. Capacitors on the power supply are there to filter unwanted noise. (Think back to the diode lab 5.) Notice the input to this circuit is a 9V battery. There are two outputs relative to the ground, +4.5 V and -4.5V. U2 is rail splitter chip TLE Read about it and find out what it does. Don t wire it backwards. ) Build the power circuit on a breadboard. 2) Measure the input and the two outputs of the circuit. Make sure you measure the outputs as precisely as possible. Perhaps use the 4 digit multimeter. You could also use the oscilloscope, AC coupled, to see how much noise is on the output. 3) In your report talk about the role of each component in this circuit. 2

3 The Amplifier Circuit Overview Each headphone speaker gets its own amplifier as shown in the circuit diagram below. So for your actual amplifier you will need two of these. For testing purposes we will only build one on the breadboard. POT C2 R V -4.5V R5 optional RB OU T R3 R4 CB Out A C2 is a µf capacitor (gray). 8 R2 is a 00 kω resistor. -In A 2 7 Out B R3 is a 2.05 kω resistor. +In A 3 6 -In B R4 is a 0 kω resistor. R5 is a short-- 0 Ω. You do not need it. POT is a 0 kω potentiometer. Use the one supplied. V In B RB = 24 kω and CB = µf are a bass boost The operational amplifier you will be using is the OPA234. It is a dual amplifier with two sets of inputs and two outputs. The pinout for the OPA 234 is shown above. V + 3

4 Theory of the circuit POT C2 R V -4.5V R5 optional RB OU R4 ) It will be R3 easier to characterize CB this circuit if you know a little bit about what to expect. One way to derive the output of the circuit is to think of the circuit as three different modules hooked together in series. Remember the rule of impedances. In your report you should convince me that this is a legitimate way to proceed. 2) What does the red circuit do? Calculate Voutred/Vin for this circuit. 3) What does the blue circuit do? Calculate Voutblue/Vinblue. 4) What does the green circuit do without RB and CB? With RB and CB? What functionality do RB and CB add? Use the golden rules of op-amps and Ohm s law to derive an equation for Vout/Vingreen for this circuit. HT: You can treat all of the stuff in the feedback branch of this circuit as Z and calculate the impedance of this separately to make the derivation less cumbersome. 5) Recognizing that Vinblue=Voutred and Vingreen=Voutblue, find Vout/Vin for the entire circuit. You will probably want to find the complex conjugate of each part first. 6) It is useful to plot the behavior of each of the three parts of the circuit separately to see how they behave. Put the equation for each circuit into a program like excel, and plot Vout/Vin as a function of frequency for the range Hz to 20 khz. For the red circuit choose two resistance values that total 0 kω to model this circuit. Why was this range of frequencies chosen? Next plot the product of the three circuits as a function of 4

5 frequency. I suggest you link to the circuit values separately so that you can vary them. For example, what happens when RB and Z CB go to zero? Characterizing the circuit ) Build the entire amplifier circuit. Instead of using the potentiometer on the breadboard, I suggest you build the circuit on the right with two fixed resistors that total 0,000 Ω. Try the following Two combinations (R A, R B ) à (2000 Ω, 8000 Ω) and (8000 Ω, 2000 Ω). Pot R A R B 2) Characterize the circuit using a sine wave from your function generator as an input to the circuit. You should make sure that the amplitude of the input sine wave is small enough so that your amplifier isn t causing the signal to clip. Measure the output and the input over a range of frequencies from Hz up through 20 khz. Make sure that your oscilloscope is DC coupled. AC coupling introduces a high pass filter to remove the DC signal and will alter your low frequency measurements. Measure at least three data points per decade of frequency. This will give you at least 2 data points. This is your primary data, so make sure that you are careful, and that you collect enough data to make a very nice graph. 3) Repeat the characterization of the circuit using the (5000 Ω, 5000 Ω) with CB=0.0µF. 4) What is the purpose of R2, C2? 5) How does the gain work? MATCHing resistors So that you hear the same thing in each ear, you will want to MATCH the resistors between the two amplifier circuits. You will want two R2, two R3, two R4 and two RB that are matched. If the resistors aren t matched, the headphone speakers will sound different, so it is critical that the resistors have the same value. We are starting with % metal film resistors, but we can do better. You will use a 4 digit multimeter to choose resistors that have the same value as measured by the meter. You may need to measure 20 or more resistors before you find two that 5

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