Wednesday, February 11, 2015

Lab 4

In Lab 4 you will complete the layout of several independent circuits. We will get these designs fabricated, and you will assemble and test the circuits in Lab 6. There are three circuits that you will lay out for this lab:
  1. The surface-mount LED flasher that you completed as part of DipTrace Tutorial Day. 
  2. A simple microcontroller board. One possibility is a copy of the Arduino Micro, and you can find the schematic on their website. Other possibilities can be discussed with the staff.
  3. An analog drum voice. Schematics will be provided in class.
To complete this assignment, you must deliver the following documentation:
  1. Simulations of the first and third circuits in LTSpice
  2. A complete schematic for each circuit
  3. A complete bill of materials for all the parts (including source, stock number, and cost)
  4. A complete layout in DipTrace (suitable for fabrication)
Lab 4 is due Monday, February 23.

Monday, February 9, 2015

Drum Machine Documentaries

Homework: watch the following videos about the Roland TR-808 drum machine.

First up is a short trailer for an upcoming documentary called "808" (premiering at SXSW).

Second is an excerpt from the  BBC documentary "The Shape of Things that Hum".

If you have the time (82 minutes), the full documentary is on YouTube. It discusses a number of important electronic instruments, including the MiniMoog synthesizer, the vocoder, the Yamaha DX7, the CMI Farilight, the Simmons drum machine, the Roland TB-303 bass synthesizer, the Roland TR-808 drum machine, and the Akai Sampler.

Saturday, February 7, 2015

DipTrace Tutorial Day

The class assignment for Monday (February 9) is to complete two tutorial projects in DipTrace. Before class on Monday, please complete the following homework:
  1. Get DipTrace installed on your laptop. See the Olin instructions here.
  2. Get the DipTrace Tutorial PDF file.
In class on Monday, we will complete the following projects:
  1. Complete the schematic and layout tutorial, pages 1 through 79.
  2. Complete a second layout of the "Astable Flip Flop" using only surface-mount parts.
    • Transistors: ON Semiconductor MMBT3904LT1G (SOT23 package)
    • Capacitors: 33uF  TDK Corp C3216X5R1C336M160AB (1206 package)
    • LEDs: Lite-On LTST-C170GKT (0805 package)
    • Resistors R2 and R3: 680 ohms (0805 package)
    • Resistors R1 and R4: 34 kilohms (0805 package)
    • 9V battery connector (use same through-hole connector)
Minimize the size of your PCB layout to save space. Save your second layout in a safe place when you are finished (we will get these designs fabricated as part of Lab 4).

After class on Monday, you may want to watch some of the (advanced) Video Guided Tour (should take less than 30 minutes). Make note of any jargon or concepts that you don't understand.

One additional project that we might get started, time permitting, is the layout of a simple microcontroller.  This design is based on the Arduino Micro, and you can find the schematic on their website.

Thursday, February 5, 2015

Lab 3

Reverse Engineering. Take apart and fully document a piece of commercial electronics (provided). Assemble a complete documentation package describing the circuit, components, and behavior of the object. Deliverables (as a web page):
  • Basic test results showing behavior
  • Block diagram of system
  • Bill of materials of all parts
  • Complete schematic of circuit
Document package is due February 12.