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All videos use the AVI container and Xvid/MP3 codecs.
Surveillance cam time lapse
2 years mr. postman (5.3 MB) - 2006/09/01
This is one of my crazy ideas, picking all the images from my surveillance cam
archive that had a postman in them (took about 2 hours for 2 years of images),
and adding them together in this funny little time lapse video. I am continuing
to collect the pictures at the end of every month, to make an even longer movie
some time in the future.
2 years in 25 seconds (6.1 MB) - 2006/08/12
2 years of cam images, of course not every single picture is contained. I wrote
a perl script to extract images by daytime from the archive, selectable from
1 to 24 images a day, in this case it was 2 or so, around noon.
3 months in 3 seconds (3.6 MB) - 2004/09/13
Same for this video, but this time about 1-2 images a day.
July 2004 in 20 seconds (2.8 MB) - 2004/08/01
Nothing special, as it says this video covers July 2004, added in a time lapse of 20 seconds.
Again, this doesn't contain all the images, but about 15 per day.
A day in 30 seconds (1.5 MB) - 2004/07/01
Another time lapse using surveillance images, this time the cam wasn't set on
motion detection as usual, but on interval triggering to get a linear passing
of time in the final movie.
All motion images out of 24h (1.2 MB) - 2004/07/01
This time all motion images of one day were used, but the detection area was expanded
to cover the street as well, so a car passing by would trigger it. To my surprise the
Kindergarden group of my little sis came for a short visit that day.
Electronics
Etching a PCB (400 kB) - 2006/08/10
My first try to etch a PCB in my new etching device. Too bad I forgot to cover
the backplane of the PCB with tape - I had to etch another one afterwards.
Actual time for 1 frame was about 8 seconds.
10MHz controlled precision LCD clock synced to GPS (290 kB) - 2006/06/25
After I finished my GPS synced frequency standard prototype on breadboard, I wanted to try this.
I built a simple LCD clock with an AVR controller, and wrote the software so that a 10 MHz
clock signal for the AVR could be used as timebase. A 1pps signal from the GPS board
was used to start the clock (time was pre set in the software), and then I let it run off
the 10 MHz for a day or two, and took this video showing no visible derivation.
I then calculated that even after weeks of operation there should be no derivation visible.
13MHz VCXO slowly phase locking to 12 MHz XO (174 kB) - 2006/05/16
A small experiment using the LMX2306 PLL with extreme low frequency of 13 MHz on the RF pin.
The scope showing the phase locking process can be seen in the video.
PLL controlled FM transmitter prototype (473 kB) - 2006/03/26
This is my FM transmitter prototype, getting fed with music and transmitting on 107.2 MHz
with a (relatively) stable PLL lock. The yellow LED displays in-lock state, therefore
flickers when modulation is applied.
An old counter for operating-hours (51 kB) - 2004/10/14
Just a slow counter that displays operating hours with one digit after the decimal point,
as it crosses its max value (which is 11.4 years) and goes back to zero.
Fancy clock with water and penguins (87 kB) - 2004/10/12
Rather funny time lapse of a clock that has a penguin getting pulled in a circle
a little bit every second, using a magnet of some kind.
Xrays
SFH-203 silicon PIN photodiode lit by xrays (836 kB) - 2008/04/19
An SFH 203 PIN photodiode for visible light was used as an X-ray sensor on my Tektronix 2445 scope
set on 1Mohm DC coupling. I calculated that this gives a bandwith of about 10kHz, which was enough to
display the Xray pulse waveform that I expected to find in that half of the mains sine wave where
the anode in the tube is positive. The diode was electrically and optically shielded by aluminum
foil and this is the first time I have measured the Xray output with such a high time resolution.
The top trace is half of the mains period, the bottom is the photodiode. Note the small xray pulse
before the cathode filament is even heated up. I suspect this is caused by some free electrons
floating inside the tube, getting pulled to the anode by the very first pulse of high voltage.
The flat plateau of the pulse is supposed to be 50keV.
Casio fx82solar calculator lit by xrays (490 kB) - 2006/10/28
In this test I wanted to find out if it could operate with only xrays, since other
solar cells I tested before showed about 1-2 Volts in the xray beam. Therefore
I covered the solar cell with aluminum tape and as you can see it didn't work.
But I had the video done already so why not put it here anyway. By the way, the
voltage across the solar cell with working calculator in visible light is about 2 Volts.
In xrays there was practically nothing measurable.
Energy saving lamp lit by xrays (430 kB) - 2006/10/28
After recording the rather disappointing video of the calculator, since I had the
webcam all set up, I decided to film something just a little more spectacular, and
therefore put this energy saving lamp in the xray beam.
Mp3-player playing music inside xray beam (2.9 MB) - 2005/08/08
For this one I put my Mp3 player in front of the xray radiator, and connected its phone out
to my laptops line in. Then started to record video and sound and xray it a little.
As proof of the xrays and for a little visible effect I put fluorescent paper in front
of the player and yes, its the kind of paper you get in handicraft shops and kids use it
to make stars for their rooms ceiling. As you can see and hear it is more likely
that you are going to get sick than your mp3 player is going to stop playing music.
Others
Mouse eating cheese in our basement (285 kB) - 2006/07/06
After I found out about this little guy in our basement, I set up a delicious meal
in front of my webcam/laptop running motion detection software. The following night
he gave off quite a show, but I guess the cheese wasn't really tasty.
Balloon taking off with milkbox / xray pic (2.5 MB) - 2005/08/21
This is one of the ideas you might get when having a bottle of helium at your disposal.
I took a bin bag, those particular ones are called "Gelber sack" and are used for
recyclable waste in Germany. They are pretty big when filled with gas, and
provide a lot of lift, especially when you use 2 or more of them. I attached a little card
with an xray pic, a message and an empty milk box to one of them and took this video.
Continuous discharge in building-up vacuum (2.8 MB) - 2005/06/18
A setup with a rotary slide vacuum pump, and a high voltage generator using a flyback
transformer were used to make this video. While the air is being evacuated from the cylinder,
the discharges change in appearance and at the end the whole negative electrode glows from
the few air molecules left impacting it at high speed due to the low density. If I had
a better pump, the discharge should at some point vanish completely, and also
xrays could be generated. But I don't have that luxury.
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