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Air Hacking Hack Chat Transcript
Log from Air Hacking Hack Chat
Stephen Tranovich12:05 PMSpeaking of which, let's get this Hack Chat started! A BIG welcome to @Amitabh Shrivastava for joining us on today's chat. Why don't you start us off by telling us a little about yourself? Boian Mitov12:05 PMWelcome @Amitabh...

The Hull
Log from Project C.A.T.P.O.O.P.
I decided to use a trimaran design for stability. Since this is a prototype, low price and speed of construction is the most important factor. I looked around my shop for 'stuff that would float'. I saw an old pair of PVC outriggers from my homemade...

Precision
Log from Shop Reorganization
I have not had much to post recently, but I have had time to get some work done.I was able to cut out the shell of the drill press storage and get it painted.I'm pleased with how it turned out in the end, but I had some troubles both with my track saw...

Discrete Dual Quad NAND using PCB Isolation
Log from A Discrete Transistor 7400 NAND GATE
PCB IsolationI recently revisited the design using a PCB rather than a prototype board.Here is board after milling:Here is the complete board with eight NAND gates:Want to build a Discrete Transistor CPU?If you have ever contemplate building a transistor...

Blinking LEDs at 28 MHz
Log from LED Oscilloscope Mk. II
So I wired up some 74AC logic to drive the horizontal board, and hooked up an AD9200 ADC to the vertical board. I found that the maximum usable sampling rate was just under 30 MS/s, with good results at 28. The limitation seems to be the...

The Control Panel
Log from Simple ALU from discrete components
Building the Arithmetic Unit is great, but as it is there is no simple way to assess its workings. As I've built it, I am personally know what to look at, but for most outside people, the shining of the LEDs on the board is still cryptic. Also, by no...

First sedate the patient.
Log from Adding a light touch to a "classic" microscope.
Since the microscope in question was actually a pile of broken microscopes (dumpster find), with just about enough parts to make two working 'scopes, the majority of the work in this project was spent cleaning repairing and re-assembling the optics and...

Control & Timing Board
Log from Building a PDP-11
OK, while I'm waiting on parts to get the M8047 working, let's go back and look at the control & timing board. Again, the goal here was to use parts I had on hand and that rule applied to the PCB and sockets as well as the chips. I had...

Cathode ordering
Log from MS6205 graphical mode
I replaced most of the logic board with an Arduino Nano. The only original parts used on the original board is the 12V→240V DC-DC converter, and traces feeding the 5V power through the board. After connecting I checked that shifting values into the anode...

Trust in Cyanoacrylate
Log from Hubsan X4 Replacement Frame
Note to self: design-for-manufacture is NOT the same as design-for-assembly. Especially when DFM translates into "who cares, we're 3D printing it anyway, I'll just watch wall thickness and drain holes and be good to go". Mocking up the X4 frame proved...

Electronics Design (Redux)
Log from Squirco Smart Home System - Sensor Network
Two project logs ago I posted pictures of what I called "final" hardware. That was a total lie.I'm going to make up for it by detailing the evolution of the hardware through some of the major revisions, as well as the decisions that drove the design...

Another method to create the wrapper
Log from Libre Gates
For now I manually create the "wrapper" unit that maps the inputs and outputs to a pair of unified vectors. In private, Tristan told me there was some sort of Python thing that could do what I need but I'd rather avoid Python and experimental (like,...

Laser Cut Inserts
Log from Star Trek: The Mirror Universe Pinball
1/2013: Mid week last week; I activated my Techshop.ws membership and schedule myself for the Laser cutter SBU on Saturday. No; I didn't feel like I needed the SBU; but given my issues with my personal laser cutter - I still needed to make some progress....

Synthesis and Technology Mapping
Log from VHDL/Verilog to Discrete Logic Flow
This is where things get a bit more interesting. I was concerned that it was quite difficult to coerce Yosys into using my custom gate libraries, but in fact it was rather easy. The "cmos" example proved to be an excellent blueprint to creating a custom...

Mechanical Details
Log from Seismometer
This log contains the details of the mechanical stuff -- the dimensions and materials. I will attempt to generate a concise description of how to build the seismometer in the Instructions section. I believe these drawings are accurate. Sorry for the...

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