https://revspace.nl/api.php?action=feedcontributions&user=Stappers&feedformat=atomRevSpace - User contributions [en-gb]2024-03-28T11:19:18ZUser contributionsMediaWiki 1.32.1https://revspace.nl/index.php?title=Over_RevSpace&diff=1066Over RevSpace2011-12-23T17:32:43Z<p>Stappers: unbreak URL by removing trailing slash</p>
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<div><br />
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=== What is Revelation Space? ===<br />
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Revelation Space is a non-profit foundation, founded in 2009 to facilitate a meeting and project space in The Hague for researchers and hobbyists that relate to technology, science, art and culture.<br />
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We offer a location for workshops, presentations and lectures about electronics, software and engineering in general. These are organised by our participants, or the general public, based on their personal drive for sharing.<br />
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In addition, Revelation Space has a workshop where people can use tools and materials.<br />
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Finally, the space functions as a place for social gathering, where people meet and exchange ideas and knowledge.<br />
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=== Where can I read more about hackerspaces? ===<br />
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Wikipedia has an [http://en.wikipedia.org/wiki/Hackerspace article about hackerspaces] ([http://nl.wikipedia.org/wiki/Hackerspace Dutch]). More can be found at [http://hackerspaces.org/ Hackerspaces.org].<br />
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=== Do I have to be a paying participant to participate? ===<br />
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In general, guests are welcome whenever the space is open. However, as a foundation and as a community we depend on contribution fees and donations to survive. Official participants get extra privileges; read more about this on the [[Membership]] page.<br />
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=== I like to know more ===<br />
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Please drop by on one of our [[AgendaEvents|scheduled]] events, you can find us in The Hague at this [[ContactAndRoute|location]], or send an email to general@revspace.nl.</div>Stappershttps://revspace.nl/index.php?title=Revspace-does-28c3&diff=1065Revspace-does-28c32011-12-23T13:35:12Z<p>Stappers: Who plus me</p>
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<div>{{Event<br />
|Name=Revspace 28c3 site<br />
|DateStart=2011-12-27<br />
|DateEnd=2011-12-30<br />
|Contact=FooBar<br />
|Info=<nowiki>Revspace will be the spot to go to if you can't be in Berlin</nowiki><br />
|InfoLocation=Revspace (all areas)<br />
|InfoOpen=Daily from 12:00 to 00:00<br />
|InfoTicket=Free<br />
}}<br />
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== What ==<br />
<br />
As you may (or may not) know, the Chaos Computer Club organises a yearly conference for hackers. The 28th edition of this conference will take place in the Berlin Congress Center from december 27th until december 30th. The CCC Conference has been getting bigger and bigger every year, and every year it's been getting harder to get a ticket.<br />
<br />
== Why ==<br />
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This year the first batch of tickets sold out in 3 minutes, and the second batch in a mere 30 seconds. This made a few regular visitors of CCC conference decide not to go this year, but instead just view the video-streams from the comfort of Revspace.<br />
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== How ==<br />
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We will be showing (with projectors) the 3 streams of the lectures @ 28C3, and people visiting Revspace can discuss related subjects.<br />
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== Who ==<br />
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* Use the [http://www.facebook.com/events/292474467455183/ facebook event] to let us know you will be coming, or post an update below:<br />
* [[User:FooBar|FooBar]]<br />
* [[User:Juerd|Juerd]]<br />
* <tt>Stappers</tt> on wednesdaynight.<br />
*<br />
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== Other locations ==<br />
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Can't make it to Den Haag, no problem, there are equivalent events in other locations:<br />
* Rotterdam: http://28c3nl.hotglue.me/<br />
* Heerlen http://www.facebook.com/events/195615243860760/<br />
* Arnhem: https://hack42.nl/wiki/CCC_in_het_KKN6</div>Stappershttps://revspace.nl/index.php?title=Contactgegevens_en_Route&diff=1064Contactgegevens en Route2011-12-23T13:30:48Z<p>Stappers: OSM</p>
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<div>= Address =<br />
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Revelation Space <br><br />
Binckhorstlaan 172 <br> <br />
2516 BG Den Haag <br><br />
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[http://www.openstreetmap.org/?lat=52.06939&lon=4.33694&zoom=17 Open Street Map]<br />
Or: [http://bit.ly/5IxLHB right here] (note, the car dealership banners have since been removed)<br />
<br />
* Cell: +31-6-4754.8880 <br />
* Voip: +31-70-2127681<br />
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* Bank account number 43.11.58.207, ABNAMRO Den Haag.<br />
* IANA PEN: 36206<br />
<br />
__FORCETOC__<br />
<br />
== Getting there by tram ==<br />
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The nearest tram-stop is 'Weteringplein', where [http://htm.net/ line 17] calls. It is right in between the stops Den Haag Centraal and Den Haag HS, which are the two main railway stations.<br />
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From there it is a 10-minute walk to the space:<br />
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* When getting out of the tram, follow the road that runs parallel to the viaduct, walking in the direction of the upwards slope;<br />
* When you get at a crossing wit h traffic lights, turn right (you are now on the Rijnstraat, which continues as the Lekstraat and finally as the Binckhorstlaan after the train viaduct);<br />
* After about 8 minutes you will see nr. 172 at your left hand, you're there!<br />
<br />
From Den Haag Centraal (where several, if not most, of the regional tram and lightrail lines call) it is also within walking distance. See [#Getting_there_by_train|Getting there by train].<br />
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== Getting there by bus ==<br />
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During the day, there are three busses that call near the space:<br />
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* [http://htm.net/ Bus 26] - from Kijkduin to Voorburg, stop 'Zonweg' is very near the space (get out at McDonalds) - after about 20:00 hours this bus will terminate a few stops early at Den Haag HS (train station);<br />
* Bus 30 - from Den Haag HS (train station) to Maassluis - stop 'Wegastraat' is very near the space (get out at McDonalds) - after about 19:30 hours this bus will terminate at Rijswijk, which is miles from the space.<br />
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== Getting there by train ==<br />
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Travel to Den Haag Centraal or Den Haag HS. From there, either take a bus or tram (see ...) or walk.<br />
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From Den Haag Centraal (about 15-20 minutes walking):<br />
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* Exit the station at the left side (where platforms for tram 8, 9, 10, 16 and 17 are) and then follow the road left along the railway (this is the Rijnstraat, which continues as the Lekstraat);<br />
* After about 6-8 minutes, you will traverse underneath three train viaducts, you are now on the Binchorstlaan;<br />
* After another couple of minutes, you will see nr. 172 on your left hand, you're there!<br />
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From Den Haag HS (about 15 minutes walking):<br />
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* Take the exit on the east-side of the station, in the direction of the 'Haagse Hogeschool' (Technical University), take the diagonal bridge, at the end of the bridge continue in the same direction (on the other side of the water, follow Neherkade), until you reach the !McDonalds at the intersection with the Binckhorstlaan.<br />
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== Getting there by car ==<br />
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From outside of Den Haag, take A4 or A13 to Den Haag. Then take the A12, and leave the highway at exit 4 (Voorburg). Turn left at the traffic lights, follow the road (Maanweg) until it makes a bend to the right. You are now on the Binckhorstlaan. Take a right at the second traffic lights after the afore-mentioned right curve (big intersection, at !McDonalds). Park your car, you are there!<br />
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From inside Den Haag: man, don't you know how to drive to the Binckhorst??</div>Stappershttps://revspace.nl/index.php?title=ChaoticCircuits&diff=1063ChaoticCircuits2011-12-23T13:27:53Z<p>Stappers: </p>
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<div>{{Project<br />
|Name=Chaotic circuits<br />
|Status=Completed<br />
|Contact=gori<br />
}}<br />
<br />
see also [[IgorsProjectIdeas]]<br />
<br />
__FORCETOC__ <br />
<br />
Build a simple electronic chaos demo for my course. Chaos can be observed using an oscilloscope. A portable one can be built with [http://code.google.com/p/arduinoscope/ an arduino]<br />
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== Background reading ==<br />
* One of the simplest possible chaotic circuits : http://www-physics.ucsd.edu/~des/DSmithChaosExperiment.pdf<br />
* This one seems particularly interesting - possibility o encrypt analog sygnal : http://www.fortunecity.com/emachines/e11/86/circsync.html<br />
* http://www.cornellcollege.edu/physics/courses/phy312/Student-Projects/Chaotic-circuits/Chaos.html<br />
* Original paper: [httphttp://link.aps.org/doi/10.1103/PhysRevLett.47.1349 Period Doubling and Chaotic Behavior in a Driven Anharmonic Oscillator]<br />
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== Version 2.0 ==<br />
Create the circuit that works at a lower frequency. Smith also describes a circuit that operates at 75 KHz instead of 2 MHz. Main bottle neck is the required large inductance<br />
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Goal is to :<br />
* Be able to hear the chaos<br />
* Have the whole thing portable, without the need for an external oscilloscope and signal generator<br />
* Have it nice and presentable so it can be used as a demo<br />
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Todo:<br />
* Calculate the inductance and capacitance required to achieve a resonant frequency in the audible range, preferably around 440 Hz. Conservative human hearing range is from 20 Hz to 15 kHz.<br />
* Identify the operational limits of the [httphttp://code.google.com/p/arduinoscope/ arduinoscope] - max seems to be around 200 kHz, well above audible range<br />
* Make sure that an arduino based scope can observe the signal. <br />
* salvage/build/buy an appropriate spool<br />
* create a suitable analogue signal generator that can drive the whole thing. Arduino can no do this, as it has no analogue circuitry for the job. PWM will (propbably) not do.<br />
* Add speakers in order to hear the chaotic harmonics under/overtones<br />
* package it is something transparent so that it makes a nice demo<br />
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<br />
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== Version 1.0 ==<br />
* Following : http://www-physics.ucsd.edu/~des/DSmithChaosExperiment.pdf<br />
* Working oscilloscope and signal generator present, capable of 2Mhz<br />
* Components according to the manual :<br />
** 200 ohm resistor<br />
** inductor, 100 microHenry needed, available a PE-53653 , with 16.1�H<br />
** diode - either works: 1N4001, 1N4004, 1N4005, 1N4007<br />
* As built, the circuit does not display any chaotic behavior as we change the amplitude, The inductor is almost 5 times to weak.<br />
* I have several spools, adding an extra spool in series, bringing the inductance up to 32 �H does not help. <br />
* When adding random spools, it is good to measure its inductance. Here is a way to do it : http://www.daycounter.com/Articles/How-To-Measure-Inductance.phtml<br />
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=== BOM ===<br />
* 1N4007 diode<br />
* 220 ohm resistor<br />
* (2 x 16) 32 �H + a random spool (code 471K 98139)<br />
* Signal:<br />
** 1.5 MHz<br />
** Amplitude op 0 dB<br />
** sinus signaal<br />
* Improvements needed :<br />
** Calculate / measure the currently installed inductance, and bring it up to spec, so that we get a nicer signal split than now<br />
* With smedings help, we determined that the inductance of the three coils is 1351 uH or approx 1.4 mH<br />
=== Results ===<br />
[[File:1-period.JPG]]<br />
[[File:2-period.JPG]]<br />
[[File:4-period.JPG]]<br />
[[File:8-period.JPG]]<br />
[[File:chaos.JPG]]<br />
[[File:circuit.JPG]]</div>Stappers