Photographing PCD8544 Epson S1D15719

I had a broken Nokia 3310 LCD on my hands, so I decided to take a photomicrograph of the display controller, PCD8544. As far as I’m aware this is the first publicly accessible die shot.

Update 2014-11-14: not actually a PCD8544. Most likely Epson S1D15719. More info to follow later.

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Closeup of a broken LCD

I broke a Nokia 3310 display, and in a closeup, both pixels and what appears to be segment electrodes at the border, are distinctive.

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Compactly organizing an E12 resistor set

In this note I describe a simple and convenient arrangement of an E12 resistor set that, crucially, takes very little space.

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A fixture attachment system for CNC3020T

I found it convenient to have a table with a grid of nuts for attaching the workpieces, that could double as victim material. In this note I describe how to make such a table out of HDPE.

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CNC3020T: poor positioning accuracy

The CNC3020T mill that I own has terrible repeat positioning accuracy. In this note I explore cause and possible solutions of this problem.

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G38: Probing workpieces in LinuxCNC

Touching off to the workpiece by hand is tedious and error-prone. Fortunately, LinuxCNC has the very convenient G38 code family, which allows to automate this process. In this note I demonstrate how G38 can be used, using squaring aluminium stock as an example.

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CNC3020T: simple wooden fixture

The CNC3020T CNC mill doesn’t come with anything particularly useful for fixing the workpiece to the table. In this note I describe a simple wooden fixture that is suitable for securely attaching rectangular pieces of material to the table.

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CNC3020T: coolant pump and CCW rotation

In this note I explain the way to extend the 3020T CNC mill with a coolant pump (especially useful for milling plastic) and also, as a side effect, a spindle direction switch.

I have used a lot of locally-sourced components which will probably be unobtainable in other parts of the world. However, it should be trivial to find equivalent ones and adapt the instructions.

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Transistor as a light source

In this note I demonstrate that a bipolar transistor can be made to emit light.

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Producing PCBs using photolitography

In this note I describe a simple and quick photolitographic process with excellent repeatability that I use for producing high-quality PCB prototypes.

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