A simple Time Domain Reflectometer


Time Domain Reflectometer PCB Component side

I built the simple signal generator described in Electronic Design. The same circuit you find on ZL1NC and epanorama. Together with an Oscilloscope it can be used to find a cable fault as described in this All about Circuits article.
The 74AC14 SMD is mounted on the board its trace side. All other parts are through-hole. Most parts were salvaged from old electronics. You can adapt the PCB to your needs.

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Raspberry Pi Hometheater

Raspberry Pi Hometheater

I was a happy user of the first model Apple TV. Then the iTunes ecosystem grew bigger and bigger. On top of that the new Apple TV is cloud- or network-based only. Not all my music can be found in the cloud, and I prefer it nearby, i.e. without the need of access to some NAS or other PC in the network. So I switched to a Raspberry Pi model 2B and 500GB harddisk in combination with Kodi.

Recently I upgraded this box with the model 3 Pi. Here follows the configuration.

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Ciclop scanner shield

Ciclop scanner shield

BQ’s Ciclop scanner comes with its own ZUM boards. My home made version is built with parts lying around, such as an Arduino Uno. Hence this simple shield for the Uno.

Download the Eagle schematics and board (100 KB).

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Oorlog en Vrede

Romanfiguren Oorlog en Vrede

Oorlog en Vrede (Vojna i Mir) L.N. Tolstoj (1828-1910)

Met zoveel romanfiguren is een schema van de belangrijkste personen wel zo handig bij het lezen.

Oorlog en Vrede
Lev Tolstoj
Vertaling Peter Zeeman en Dieuwke Papma
Tweede druk 2005
Veen Bosch & Keuning uitgevers n.v., Wommelgem, België
ISBN 978 90 4141 4595

Download het schema met romanfiguren (PDF 50 KB).

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OwnCloud Dropbox alternative on a Raspberry Pi

OwnCloud

Create your own Dropbox-like solution with a Raspberry Pi and the OwnCloud open source solution.

OwnCloud creates a folder on your computer the content of which will be automatically kept in sync with both the host and all of your peers when files are added, removed or edited.
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RepRap Mendel hot-end tuning


Hot-end Temperature graph

Tuning the Mendel hot-end, using a Tcl/Tk script for temperature sampling. The firmware used is Marlin v1 on Arduino 1.3.

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Your own dropbox with a Raspberry Pi


Sparkleshare OS X client

Create your own Dropbox-like solution with a Raspberry Pi and the Sparkleshare open source solution.

SparkleShare creates a special folder, called a repository, on your computer. You can add remotely hosted folders (or “projects”) to this folder. These projects will be automatically kept in sync with both the host and all of your peers when someone adds, removes or edits a file.

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De Chinese Schilderkunst

De Chinese Schilderkunst

Een eenvoudige, en zeker niet foutloze, Nederlandse vertaling van “Débuter la peinture chinoise” van Li Dongxu, ISBN 978-2-3500-0267-5. Te gebruiken naast het origineel want uitsluitend de tekst zonder illustraties. Bij gebrek aan een NL versie heb ik deze Franse uitgave vertaald voor mijn vriendin.

Omgezet van OpenOffice naar epub met de handige Writer2epub extensie van Luca Calcinai.

Download De Chinese Schilderkunst (EPUB 145KB)

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Save OpenOffice document Calc document via FTP

Save FTP.png

To keep track of various lists, such as books read, I use the CSV Touch iPhone app.

To publish the Calc documents on my website, I created this simple macro that shows a dialogue for userid and password before saving the spreadsheet as CSV file via FTP.

OOO Basic save FTP macro and dialog (ZIP 4KB)

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QCad 3.1 on Intel Mac OS X

QCad3.png

Still using QCad to view and edit Autocad DXF files. Finally upgraded from the Qt3 version, QCad 2, to the 2012 QCad 3.1 beta which makes use of Qt4.

For an overview of all new features, see the QCad blog. New functionality I am happy with, though I do miss the old plain icons, in order of importance:

  • SVG export and import;
  • reverse line direction;
  • isometric projection.

Compilation

Building QCad from the Github source is straightforward:

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