This is a draft list of parts for the Winter 2013 offering of Applied Circuits. There are five sections: things for students to buy on their own, things to buy (or make) for the lab, pressure sensors, tool kit for students, and consumable parts for students. The pressure sensors are separate, because I’ve not yet decided whether it is better to make them a per-student or per-lab-setup item. Note: I’ve not yet included taxes or shipping in most of the price estimates yet, which will drive up the prices. I’ve tried to avoid suppliers that lie about their prices by quoting low prices and having high shipping fees.
Students buy on their own
Currently we have only one thing for students to order on their own:
|Item||possible source||approx price|
|Arduino (recommend Uno Rev 3, but Leonardo or Duemilenova ok)||http://arduino.cc/en/Main/Buy||$25–30|
The Arduino should be a standard one with female headers, though we won’t be using “shields” that need to plug it, we will be using wire to connect to breadboards and other PC boards. I just saw a bundle that has the Uno Rev 3, USB cable, breadboard, and jumper wires for $36: http://www.amazon.com/Starter-Kit-Newsite-Uno-Breadboard/dp/B0051QHPJM/ Unfortunately, we’ll probably have to put a breadboard in the tool kit, since most students will not buy this bundle.
For the lab
We will generally need 12 copies of each item for the lab, one per station—these are a one-time expense. There are also some consumables (plastic cups, for example) that I haven’t enumerated yet, but the prices there will be tiny.
|Quantity||Item||possible source||≈price each||price|
|3||thermos||thrift store? Amazon?||< $6||$18|
|1||tea kettle (for boiling water)||www.amazon.com/Proctor-Silex-K2070Y-Electric-Kettle/dp/B00023XCWS/||$11||$11|
|12||stainless steel electrode pairs||make at home||< $1||donate|
|12||secondary containment tubs (dishwashing tubs)||http://www.amazon.com/Rubbermaid-2951-AR-BISQUE-11-4-Bisque/dp/B0000DINAX/||$6.55||$78.60|
I’m not sure a plastic ruler is really what we need for the silver electrodes. I may need to design a laser cut piece of acrylic for holding the silver wires of a fixed length at a fixed distance for electroplating and characterizing the electrode pair.
We have to decide whether to have each student assemble a pressure sensor (soldering to a breakout board with a bypass capacitor) or make up 12 of them ourselves for shared lab use (a cost of about $164).
|Quantity||Item||possible source||price each||price|
|1||MPX2053DP pressure sensor||http://www.digikey.com/product-detail/en/MPX2053DP/MPX2053DP-ND/684660||$11.526||$11.53|
|1||pressure sensor breakout board||custom, iteadstudio.com||≈$1||$1|
|1||0.1″ pitch screw terminals 4-long||http://www.digikey.com/product-detail/en/282834-4/A98335-ND/1153265||$0.5812||$0.59|
|2||M3 × 16mm machine screw||http://www.amazon.com/Machine-Screws-16MM-Pack-100/dp/B009TE0F5S/||$0.13||$0.26|
I’m assuming that we will provide soldering irons and solder suckers for the labs that require soldering.
|Item||possible source||≈ price|
|jeweler’s screwdriver set||http://www.utopiatools.com/7Pc-Jeweler-s-Screwdriver-Set.html||$2.63|
|breadboard (23 long)||http://www.goldmine-elec-products.com/prodinfo.asp?number=G19128||$3.95|
|breadboard (30 long)||www.amazon.com/microtivity-IB400-400-point-Experiment-Breadboard/dp/B0084A7PI8/ $5.40||—|
I’m not sure which of the breadboards is the better deal. We may need the slightly longer one, and it has more bus lines for power, but the shorter one looks like a better deal, if it is big enough.
I’m undecided about which loudspeaker to get for the students. I have the pair of loudspeakers in cabinets, which cost $1, but shipping raises the price to $3.79, which is not bad for a pair of speakers in cabinets. Characterizing them is a bit messy, as they have two resonances (probably one from the loudspeaker mass-and-spring, the other from the Helmholz resonance of the cabinet). The beefy 8Ω loudspeaker from Parts Express (which I estimate at $1.52 including shipping) may be a better bet than the slightly cheaper one from Digikey, as it has a lower resonant frequency and will be harder for the students to burn out. It is a buyout sale, though, so may not exist in future years.
I don’t know whether our students will need to buy wire and solder, or whether the lab can provide what they need. I’ve guessed here that they need to buy hook up wire, but that we can provide solder. I may have to adjust things if that is wrong. (With lead/tin solder costing $25/lb and lead-free solder costing $75/pound, we may not be able to provide it—it looks like little 18g tubes cost $4, if we need to sell small amounts.)
I’ve still not figured out what transistors we need, because I haven’t got the power amp lab detailed yet. The NPN and PNP transistors are placeholders—I have to figure out whether we want to use bipolar or FET transistors, and what specs we need.
There are lots of sources for cheaper LEDs, but I wanted to use ones we could get data sheets for.
I don’t know whether we’ll need the header pins—I use the double-ended ones a lot with female-female jumper wires, and to make oscilloscope probe points on a breadboard. I’m not sure the students will need the regular ones, except to put probe points on their instrumentation amp protoboards. It might be useful to have the students have a few flexible jumper wires (male-male, male-female, or female-female) for connecting their breadboards to the Arduino, rather than using solid hookup wire.