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EE3305_Design_Project.doc - EE3305 DESIGN PROJECT OBJECTIVE...

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EE3305 DESIGN PROJECT OBJECTIVE : To design an Op Amp based Stereo Earphone Amplifier. PART LIST QTY Description Part 2 IC, LM 386 Op Amps, Low Voltage Amp, 0.25W @6V U1, U3 1 Holder Battery 9V PC Mount B1 5 Capacitors, 100uF, 25V, 20%, Aluminum Radial Electro. C1, C5, C8, C9, C11 1 Capacitors, 0.1uF, 50V, 20%, MONO CERAMIC C2 2 Capacitors, 100pF, 50V, 20%, MONO CERAMIC C3, C6 2 Capacitors, 2.2uF, 50V, 20%, Aluminum Radial Electro. C4, C7 2 Capacitors, 0.047uF, 50V, 20%, MONO CERAMIC C10, C12 1 Diode, 1N4007, SIL RECT, 1000PRV, 1A D1 1 LED, Red Diffused, T1, ¾ D2 1 Jack, DC PWR, Male, 2.5MM, PC MOUNT J1 2 Stereo Jack, PC MOUNT J2, J3 2 Resistor, 270K OHM, 1/4W, Carbon Film R1, R3 3 Resistor, 10K OHM, 1/4W, Carbon Film R5, R6, R7 2 POT, TRIM, 1 Turn, 10K LIN, 3/8” SQR, PC MOUNT R2, R4 1 Switch, Slide, SPDT, ON-ON, PCB MNT SW1 1 4”x4”, Small Single Sided PCB 1 Battery, 9 Volt EQUIPMENT REQUIREMENTS Oscilloscope Portable CD player and a pair of Headphones (for Input and Output respectively) DESIGN GUIDANCE - A QUICK RECAP OF OPAMPS Operational Amplifiers are active circuit devices (they need external power to function). They have high gain and are used to perform a variety of useful functions when used with passive circuit elements. When operational amplifiers were first built, they were constructed with vacuum tubes to carry out analog mathematical operations. Subtraction was the fundamental building block made possible by differential amplifiers. Addition is just subtracting an inverted signal. Multiplication is just successive addition; division is successive subtraction with a remainder. A strategically placed capacitor in the feedback path turns the amplifier into an integrator or a differentiator. Some of the early computers like Eniac were huge, house-sized systems built to calculate ballistic tables for naval artillery. The op-amps were going to use are much smaller. A common packaging is an 8- pin chip but you can find them in just about every packaging style including surface mount. The symbol in the schematic form is a triangle with 8 leads coming from the triangle. Entire books have been written about the different uses that op-amps can fill. We’re going to use ours as a simple amplifier. Several assumptions make analyzing op- amp circuits easier. Check to see if there is any negative feedback. In other words, is there a connection between the output pin and the inverting input. If that is the case, you can use what some authors call the “summing point constraint,” i.e. the input
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current at both the inverting and non-inverting terminal is forced to zero, and the differential voltage between the inverting and non-inverting inputs is forced to zero.
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