DESIGN

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Due Date

Part 1: Tuesday, November 28, 2017

Part 2 Design: Tuesday, November 28, 2017

Part 2: Friday, December 1, 2017

About the Project

In this project, you will be utilizing a 555 timer to power a speaker! The catch is that the speaker must be able to produce a wide variety of frequencies. We'll supply most of the circuit, and you'll be filling in the rest.

Tentatively, if you want to get checked off come to either Natasha or Kyle (and not any officer).

Schematic

DESIGN partial schematic

Part 1

The speaker is powered by an oscillatory wave produced by the 555 timer. Essentially, if we replaced the speaker with a LED, the speaker would make noise every time there is a transition from ON state to OFF state of the LED. How can we change our earlier Blinky LED circuit to fit this requirement?

As you can notice in the Schematic, there seem to be a few things missing within it. As a hint, you'll probably want to look at pins 3, 6, and 7. Look back at our earlier project if you are confused.

Identify 2 ways to change resistance variably, so that the speaker can produce a continuous spectrum of various notes. Look inside the parts in your box and identify which 2 components can fit this job. Remember, we would also like to turn the speaker on and off. Is there a part in your box which will help you do that?

Here are a few links that will help out:

http://www.circuitbasics.com/555-timer-basics-astable-mode/

http://akizukidenshi.com/download/ds/senba/GL55%20Series%20Photoresistor.pdf

http://www.mouser.com/ds/2/414/Datasheet_RotaryPanelPot_P160series-1133272.pdf

http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1825910&DocType=Customer+Drawing&DocLang=English

Note: Part 1 checkoff also includes a design submission! This design submission will be how you approach Part 2 below. This is to ensure you will be soldering the correct circuit for Part 2. The design submission will simply be talking about an officer on how you will be doing Part 2.

Part 2

You'll be soldering the circuit in this part. This time there's another constraint: You must have the option of playing 3 distinct note frequencies without physically adjusting any of the variable resistors on the device (i.e. if I play one note and then play the second note, I should be able to play the first note again with ease). You must be able to change these 3 notes. Check in with an officer at IEEE before starting this though!

Slides: https://docs.google.com/presentation/d/1eKQ_XvAXZw87nrZ6qxqMzI2v9lDfAag_Vw5nfGTfObE/edit?usp=sharing