http://www.opencircuits.com/api.php?action=feedcontributions&user=89.19.172.22&feedformat=atomOpenCircuits - User contributions [en]2024-03-28T15:44:04ZUser contributionsMediaWiki 1.34.2http://www.opencircuits.com/index.php?title=OpenCircuits:Community_portal&diff=17034OpenCircuits:Community portal2008-12-17T08:12:12Z<p>89.19.172.22: FIELD_OTHER</p>
<hr />
<div>Welcome to Open Circuits.<br />
This is a good place to talk about Open Circuits, as a whole.<br />
<br />
We have {{NUMBEROFARTICLES}} articles now. Yay!<br />
<br />
I need only news about health and bank today!,<br />
<br />
== Anti-Vandalism Bot ==<br />
<br />
''moved to our page discussing [[Spam]].''<br />
<br />
== electrical mailing lists ==<br />
Yahoo claims they have<br />
[http://dir.groups.yahoo.com/dir/Science/Engineering/Electrical 1,831 electrical engineering mailing lists].<br />
What would be a good way of letting the people on those lists know about the Open Circuits wiki, without spamming them?<br />
--[[User:DavidCary|DavidCary]] 13:30, 31 May 2006 (PDT)<br />
<br />
* Publish cold fusion howto :-)<br />
* Send one email/week and only once per list. And be on topic, listen carefully for responses.<br />
[[User:Freqmax|Freqmax]] 16:24, 30 July 2007 (PDT)<br />
<br />
== about Open Circuits ==<br />
So, is there any connection between http://OpenCircuits.org/ , http://OpenCircuits.net/ , and this http://OpenCircuits.com/ wiki?<br />
--[[User:DavidCary|DavidCary]] 23:47, 13 June 2006 (PDT)<br />
<br />
No. There is no connection between any of http://opencircuits.com and the other websites listed.<br />
[[User:Chazegh|Chazegh]] 02:55, 18 June 2006 (PDT)<br />
== web rings ==<br />
Document an original microcontroller project and join a PIC webring, or AVR webring. 20 June 2006<br />
<br />
== audio electronics ==<br />
<br />
Is there some other wiki for people to talk about audio electronics?<br />
Or is this Open Circuits the best wiki for talking about things like<br />
''"[http://analog.com/ Analog Devices] AN-221: The Alexander current-feedback audio power amplifier"'' by Mark Alexander<br />
?<br />
<br />
I think I would prefer to offload all the audio electronics controversies to some other wiki<br />
(but which one?).<br />
Still, it would be nice to have some "tips for high-power electronics" here.<br />
I imagine that tips page would list the various quirks of high-power MOSFETs, BJTs, TRIACs, and IGBTs,<br />
and (given a particular motor or speaker or other load)<br />
how to select one over the others,<br />
and various ways of working around those quirks.<br />
--[[User:65.70.89.241|65.70.89.241]] 07:17, 10 August 2006 (PDT)<br />
<br />
I just joined Open Circuits. I have been servicing and designing audio equipment for several years (Recording consoles a specialty) I hope you will have a section for audio electronics. I also work with video projection systems and theatrical lighting (stage struck at an early age) I play electric rock-blues guitar, so I also am interested in tube guitar amps (Marshall and Boogie). And there is a big difference in what a guitar player thinks an amp should do, and what a recording engineer wants an amp for. I think these are valid points for discussion.<br />
I've also got an interest in power supplies (my experience is mostly with linear, but I've started learning about switching designs). In fact that brings me to my question, I have some regulator designs based on the 723 that I'd like to share. How do I go about doing that? I built a replacement for a console /- 18V @6A supply when I couldn't find the original regulator devices. I used 723s with external series pass devices. The unit has been working for close to 10 years now, so I think the design is worth sharing. Is anyone interested? <br />
<br />
I also research discrete op amps like the Jensen 990. I've been working (on and off for years) on a clone of that using more modern, easily available parts and devices. Anyone else?<br />
Finally, in response to the first entry in this section, I too read that application note in Analog Devices Audio/Video Reference Manual. My copy is dated 1992. I've repaired a lot of amplifiers, but haven't built any. If anyone else is hip to this amp I'd like to hear about it. It is a very unique design. I also like the A75 amp design from Nelson Pass and Norman Thagard, and the Leach Amp by Marshall Leach. The last two are pretty normal as far as design goes, not as adventurous as the Alexander with its current-feedback approach.<br />
Aloha, RAF--[[User:66.8.194.185|66.8.194.185]] 14:04, 18 May 2007 (PDT)<br />
<br />
== automotive electronics ==<br />
<br />
Is there some other wiki for people to talk about automobile electronics?<br />
Or is this Open Circuits the best wiki for talking about things like<br />
[http://megamanual.com/ "experimental Do-It-Yourself programmable electronic fuel injection controller"]?<br />
Or should we just point people who want to talk ECUs (engine control units) to the <br />
[http://msefi.com/ MSEFI discussion forum],<br />
even though it sadly lacks a wiki?<br />
--[[User:DavidCary|DavidCary]] 22:36, 2 July 2007 (PDT)<br />
<br />
How about converting a car to EV - Electrical vehicle, how to build an electrical motor controller? DC or 3-phase AC controller..<br />
Mr. Holland<br />
<br />
== inviting bloggers to open circuits ==<br />
<br />
=== how to connect a JTAG probe to a Nokia phone ===<br />
<br />
I'd like to invite bloggers such as GyrosGeier to edit OpenCircuits.<br />
Rather than just spamming him, I think he would be more inclined to help out<br />
if we answered one of his questions first -- such as<br />
[http://hogyros.de/?q=node/167 "If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."]<br />
Maybe I should start a page on [[JTAG]]...<br />
--[[User:DavidCary|DavidCary]] 09:37, 22 September 2006 (PDT)<br />
<br />
The [http://hackedgadgets.com/ Hacked Gadgets blog also has a bunch of cool electronics].<br />
--[[User:DavidCary|DavidCary]] 11:58, 5 January 2007 (PST)<br />
<br />
FIELD_MESSAGE_baszelletod<br />
<br />
== inviting people from other forums to open circuits ==<br />
<br />
Lots of people talk about circuits for LED lighting at<br />
http://candlepowerforums.com/<br />
.<br />
Perhaps we can talk some of them into contributing here -- perhaps using a page or two of Open Circuits as a FAQ for LEDs and drive circuits.<br />
<br />
== tool lists ==<br />
<br />
Should we have an entire page on "tools", and mention it on the main page?<br />
That risks listing *every* tool anyone has ever heard about,<br />
like the page at<br />
http://massmind.org/techref/tools.htm<br />
.<br />
Yes, I'm responsible for uglier bits on that page;<br />
I think the wide variety of oscilloscopes are particularly confusing.<br />
How could we cut through the confusion?<br />
<br />
I see the "techniques" page already has a list of software tools.<br />
Perhaps it would be nifty to have a short list of all the tools necessary for each technique?<br />
Then a beginner would have a better idea of what tools he really needs to get (rather than looking at a huge list of every tool, and wondering for each one, ''"Am I going to regret buying it when I see it gathering dust? Or am I going to regret not buying it when I need it during a midnight debug session?"'').<br />
<br />
--[[User:DavidCary|DavidCary]] 08:37, 24 January 2007 (PST)<br />
<br />
== Requests For Help ==<br />
Thanks for your help with the camcorder mic.<br />
<br />
== sample component ==<br />
<br />
What is the purpose of the [[Sample Component]] ?<br />
--[[User:DavidCary|DavidCary]] 16:27, 7 May 2007 (PDT)<br />
<br />
----<br />
<br />
<br />
== current surge and battery life ==<br />
<br />
Hi, <br />
<br />
currently my board is using a 3V battery, in every 40msec it will turn on its RF to communicate with the base station. I face a problem here is that my battery life is badly affected. Turning on the RF with cause a current surge. <br />
<br />
Will this surge affect my battery life? If I use a supercapacitor does it helps?<br />
<br />
-- [[User:203.120.164.208]] 04:14, 30 April 2007<br />
<br />
<br />
== MIDI electrical interface ==<br />
<br />
In my opinion, the MIDI interface got a lot of things right that too many later interfaces still trip over.<br />
<br />
* http://www.repairfaq.org/filipg/LINK/F_MIDI.html -- ASCII schematics<br />
* http://www.engadget.com/2005/08/30/how-to-control-csound-with-a-custom-midi-controller-hardware/ -- hand-sketched schematics<br />
* http://www.midi.org/about-midi/electrical.shtml "MIDI Electrical Specification Diagram &amp; Proper Design of Joystick/MIDI Adapters" -- well-drawn schematics<br />
* [http://en.wikipedia.org/wiki/The_MIDI_1.0_Protocol Wikipedia: The MIDI 1.0 Protocol]<br />
* http://en.wikibooks.org/wiki/Behringer_FCB1010_MIDI_Pedal<br />
<br />
It may look simple, but too often people try to "improve" it by adding or removing things without understanding, ending up with a worse system.<br />
<br />
Is there any other wiki that is more appropriate for explaining the low-level details of the MIDI electrical interface, and *why* it was done that way?<br />
<br />
I would be most interested in discussing new communication interfaces -- but is this really the right wiki?<br />
Or would http://en.wikibooks.org/wiki/Serial_Programming or the [http://interwiki.sourceforge.net/cgi-bin/picawiki.pl/StartingPoint PICA wiki] be better for discussing improvements?<br />
--[[User:DavidCary|DavidCary]] 13:21, 21 June 2007 (PDT)<br />
<br />
== IC design ==<br />
<br />
What do you think about<br />
http://makeyourownchip.com/<br />
?<br />
Should we talk about VLSI design ([http://david.carybros.com/html/vlsi.html "VLSI: designing electronic chips"])<br />
here at Open Circuits?<br />
Or is there a more appropriate wiki somewhere else?<br />
--[[User:DavidCary|DavidCary]] 15:59, 26 June 2007 (PDT)<br />
<br />
== electronics infoline ==<br />
<br />
So have you seen<br />
"Free electronics projects"<br />
http://electronicsinfoline.com/<br />
"with Photo Preview"<br />
?<br />
--[[User:DavidCary|DavidCary]] 00:28, 1 July 2007 (PDT)<br />
<br />
== generating a netlist with a "C++" program ==<br />
<br />
The [http://positron.ps.uci.edu/~pier/csc/sup/Support.html "Support Electronics for ATLAS Muon CSC"] documentation claims that [http://positron.ps.uci.edu/~pier/csc/sup/CRB_LayoutNotes0.pdf "The design was captured with C++. There are no schematics."] and lists [http://positron.ps.uci.edu/~pier/csc/sup/crb_srce the C++ source code].<br />
<br />
How did they do that?<br />
--[[User:DavidCary|DavidCary]] 01:15, 3 July 2007 (PDT)<br />
<br />
== rocket electronics ==<br />
<br />
Is there another wiki that talks about rocket electronics?<br />
Or is this Open Circuits the best place to talk about<br />
ground support electronics<br />
(such as [http://www.ukrocketman.com/rocketry/controller.shtml Launch Controller]s)<br />
and <br />
onboard electronics<br />
(such as one<br />
[http://www.ukrocketman.com/rocketry/compactrdasguide.shtml flight computer]<br />
or another<br />
[http://david.carybros.com/html/schematic.html#flight_computer flight computer]<br />
)?<br />
--[[User:DavidCary|DavidCary]] 14:21, 15 July 2007 (PDT)<br />
<br />
== Minimig ==<br />
I have created pages about the [[Minimig]] project which is running an Amiga 500 in a Xilinx FPGA. It's rather a work in progress, than a static documentation. I hope nobody minds. [[User:Freqmax|Freqmax]] 18:35, 27 July 2007 (PDT)<br />
<br />
== Open Science ==<br />
<br />
So does/should Open Science ( http://openscience.org/ ) have any relation to Open Circuits ?<br />
--[[User:68.0.120.35|68.0.120.35]] 00:13, 5 August 2007 (PDT)<br />
<br />
== LaTEX math markup ==<br />
<br />
I wrote a quick howto on figuring out resistor values, but it looks bad without latex math markup enabled.<br />
Here's what I wrote as it appears on open circuits: http://www.opencircuits.com/Talk:Relays<br />
Here's how it appears on wikipedia (with math markup enabled): http://en.wikipedia.org/wiki/User:Mzandrew/Sandbox<br />
<br />
Anyone know if this is a quick thing to enable for open circuits or if it's involved?<br />
<br />
[[User:Mzandrew|Mzandrew]] 14:16, 8 September 2007 (PDT)<br />
<br />
<div style="clear:both;border:1px dotted #333;padding:10px;background:#FFE400;color:#333;margin-top:10px;margin-bottom:10px;">DONE! -- [[User:Chazegh|Chazegh]] 00:10, 11 March 2008 (PDT)</div><br />
<br />
----<br />
<br />
'''SPAM DELETED!'''<br />
<br />
I deleted a whole bunch of links that had been placed at the top of this page, probably by the same AH that did it to my page. I think the best solution would be to make it so no edits are possible without being logged in. Then there will be a record of who does this kind of thing. Then they can be banned from the site. I don't think that defeats the purpose of an open wiki environment, it simply means you have to register to contribute.<br />
<br />
--[[User:RogerAF|RAF]] 10:30, 21 December 2007 (PST)<br />
<br />
At least this page is still OK. The Spam AHole hit my user talk page again today. This is very aggravating.<br />
<br />
--[[User:RogerAF|RAF]] 06:54, 22 December 2007 (PST)<br />
<br />
: ''I agree. Annoying. I'm starting to "semi-protect" most pages so they can only be edited by logged-in users. I'm leaving a couple of pages wide open as a honeypot and/or test pages, so I can make tests and ban spammers without touching good pages. I think the $wgSpamRegex and/or ReCAPTCHA would be a better way to deal with spam. But my attempt to set them up isn't working yet. Sorry. --[[User:DavidCary|DavidCary]] 10:28, 3 January 2008 (PST)''<br />
<br />
== Release 2.0 ==<br />
<br />
[http://radar.oreilly.com/archives/2007/12/new_release_20_3.html New Release 2.0: Open Source Hardware] by Jimmy Guterman<br />
<br />
Does Guterman know about Open Circuits yet?<br />
--[[User:DavidCary|DavidCary]] 01:04, 4 January 2008 (PST)<br />
<br />
== tech-assist ==<br />
<br />
Should we invite the nice people at tech-assist<br />
http://tech-assist.org/<br />
to use the Open Circuits wiki?<br />
--[[User:DavidCary|DavidCary]] 20:38, 15 January 2008 (PST)<br />
<br />
== A post I left at the Schmartboard mailing list. ==<br />
<br />
Last week I posted to the Schmartboard mailing list asking about more interface types for their system.<br />
I made reference to sites like this and pleaded the case of individuals wishing to make projects that interface a little better than the methods available now. Neal Greenburg(VP in sales) replied that they had been kicking ideas around like what I was proposing for a while, and that he would like to get some feedback. So, if you're interested, head on over and pipe in. The basic request I made was asking for common internal pc interfaces(PCI, PCI-e, AGP, ISA, etc..) to be included as an attachable module.<br />
<br />
The reason for my request was that this would allow organizations such as this one to develop hardware that is now unachievable at a decent prototyping price(quantities in the single digits). Their modules allow robust SMD hardware to be hand soldered and connected to other modules, but interfacing to a pc or other system is limited to rs232. I left a much more in depth post there, and if you're interested, you can find it there.<br />
<br />
http://tech.groups.yahoo.com/group/schmartboardsv/<br />
<br />
I'm not affiliated with schmartboard in any other way than as a customer. I'm sorry if this is seen as spam, it's not intended to be. If the general consensus is that this is spam, feel free to delete it.<br />
<br />
Thanks for your time, take care.<br />
[[User:Jonkopp|Jonkopp]] 13:49, 20 January 2008 (PST)<br />
<br />
<br />
== open source machine ==<br />
<br />
Is there some other wiki somewhere that would be better for discussing "open source hardware designs" for non-electronic mechanical hardware, such as<br />
http://opensourcemachine.org/<br />
?<br />
--[[User:DavidCary|DavidCary]] 05:52, 26 June 2008 (PDT)<br />
:: http://groups.google.com/group/openmanufacturing :-) 2008-11-28<br />
<br />
== confused ==<br />
<br />
What is up with<br />
[[User talk:Sunnyhouselife]], [[User talk:Kaylee]], [[User talk:Seekic]]<br />
?<br />
I'm guessing that English is not their native language.<br />
--[[User:DavidCary|DavidCary]] 08:08, 10 July 2008 (PDT)<br />
<br />
== ultrasonic ==<br />
<br />
Is there a better wiki to discuss [[ultrasonic]] stuff?<br />
Such as:<br />
[http://www.brooker.co.za/fers/ "FERS: the Flexible, Extensible Radar and Sonar Simulator."]</div>89.19.172.22http://www.opencircuits.com/index.php?title=Atmel&diff=17013Atmel2008-12-17T00:27:13Z<p>89.19.172.22: FIELD_OTHER</p>
<hr />
<div>FIELD_MESSAGE_eldomtralrel</div>89.19.172.22http://www.opencircuits.com/index.php?title=Sensors&diff=17002Sensors2008-12-16T19:50:58Z<p>89.19.172.22: FIELD_OTHER</p>
<hr />
<div>Accelerometers, Gyroscopes, Temperature Sensors, Pressure Sensors, ...<br />
<br />
----<br />
=== General ===<br />
A sensor is a device that converts some physical measurement into an electrical signal. This allows remote sensing, display of variables, and recording of values. There are a wide variety of sensors, we touch on them only fairly briefly here. Note that some standard components can be used to make or as sensors by themselves. A normal signal diode, for example, has a forward voltage drop that depends on temperature. Thus it can be used as a temperature sensor. In "Further Reading" we have some good references for more information on sensors and interfacing to sensors.<br />
<br />
=== Accelerometer ===<br />
These measure ( gasp ) acceleration. May be caused by gravity or the second derivative of position ( relative to an inertial frame ). Since acceleration is a vector to go the whole distace you need a 3 axis sensor, but often 1 or 2 D will do. Often the output is a voltage(s). Feed it to a microcontroller with an a to d converter, perhaps through an operational amplifier. [[Op amp]]<br />
<br />
* [http://podophile.com/2006/08/02/accelerometer-101-understanding-the-nike-ipod-sport-kit-sensor/ Accelerometer 101: Understanding the Nike iPod Sport Kit Sensor]<br />
<br />
* [http://www.sparkfun.com/commerce/product_info.php?products_id=849 Accelerometer Breakout Board - ADXL322 +/-2g SKU#: SEN-00849 Price: $29.95] From SparkFun. Also links to other info.<br />
<br />
* [http://www.dimensionengineering.com/DE-ACCM2G.htm Buffered ±2g Accelerometer Product ID: DE-ACCM2G Price: $22.95] Also other links.<br />
<br />
*[[PIC Links]] Then search for Accelerometer.<br />
<br />
=== Gas sensor ===<br />
* [[Image:4514.jpg|100px]] [[MiCS 4514]] CO and NOx sensor<br />
----<br />
<br />
=== Knock Sensor === <br />
* [http://www.arduino.cc/en/Tutorial/KnockSensor Knock Sensor]<br />
<br />
FIELD_MESSAGE_varaco<br />
<br />
=== light sensor ===<br />
<br />
* photo diode<br />
* photo transistor<br />
* LED: a [[light-emitting diode]] can be wired "backwards" and used as a light sensor. See [[light-emitting diode#sensor]]<br />
<br />
<br />
----<br />
<br />
=== Rotary Encoder ===<br />
A rotary encoder is a device that measure ( or encodes ) rotational motion. The old fashioned mice with a ball used dual rotery encoders one to measure motion in the x direction one to measure motion in the y direction. This may be done using switching technology or by using optical methods ( so some encoders may be considered optical electronics ). Even stepper motors may be used as rotary encoders. It normally requires a microcontroller ( or speciality chip ) to decode the signals. In addition to mice rotary encoders are used for the user control on volume controls ( finally coupled to say digital potentiaometrs ), measure the position of joints in robots, or measuring the speed and/or positon of motors ( as in some servo motors ).<br />
<br />
* [http://www.arduino.cc/playground/Main/RotaryEncoders Reading Rotary Encoders]<br />
* [http://www.robotroom.com/Counter.html An Electronic Counter Project for Digital and Analog Signals, including Quadrature Encoders]<br />
* [http://users.tkk.fi/~jwagner/electr/rotary-enc/ Inexpensive rotary encoder]<br />
<br />
=== Linear Encoder ===<br />
Like rotary encoders but for linear motion. Modern digital calipers are based on this technology ( i think ). Positioning of print heads in computers may also uses this to position the print head.<br />
<br />
=== Temperature Sensor ===<br />
Some are analog some are digital. All can use microcontroller interfaces again digital or analog. Two analog devices are LM34 and LM35, they are very easy to use because the voltage output is directly proportional to the temperature. Dallas semiconductor makes a line of sensors based on their one wire networking, cool. Temperature may also be sensed by thermistors ( temperature sensitive resistors ), the forward voltage on a diode ( or transistor ) or by thermocouples ( junctions of two different conductors ). Thermocouples can work up to almost the melting temperature of the conductors. You can also sense temperature based on the light emitted ( usually ir ) from the object. Many of the temperature sensors can be highly non-linear in their response, programming in a microcontroller can be used to linearize the readings.<br />
<br />
*[http://www.instructables.com/id/Water-proofed-temperature-sensor/ Water proofed temperature sensor] from instructables.<br />
*[http://spreadsheets.google.com/pub?key=pobKDna9aVYccbtu0zqXvEA&gid=0 thermistor test result] from mainland china - shenzhen<br />
<br />
=== Stress Sensor ===<br />
Also know as strain gage. Often based on materials where the resistance varies when elongated. Typically have very small signal output that are measured in bridge configurations.<br />
<br />
=== Pressure and Barometric Sensor ===<br />
Solid state units have become available for this. We need more material here. They can be used for weather stations, measuring altitude, or measuring pressure.<br />
<br />
=== Capacitive Sensor ===<br />
These measure capacitance, but normally this is the means to measuring something else: for example moving your hand close to a metal plate increases its capacitance to ground. Measuring the capacitance thus measures the the touch ( or near touch ). Two insulated electrodes on either side of a glass tube can detect the presence of water in the tube by the change capacitance.<br />
<br />
== Further Reading ==<br />
<br />
* [http://wsn.oversigma.com/wiki/index.php/Sensors WSN:Sensors]<br />
* [http://www.arduino.cc/playground/Main/InterfacingWithHardware#Input Interfacing with Hardware] See the section on "Input" Writtern for the arduino but usefull just for the info on sensors.<br />
* [http://itp.nyu.edu/physcomp/sensors/Main/HomePage Welcome to the ITP Sensor Workshop Wiki.] A whole wiki on sensors, looks good.<br />
* [http://www.sensorwiki.org/index.php/Main_Page Welcome to SensorWiki.org] A wiki just about sensors.<br />
* [http://newton.ex.ac.uk/teaching/CDHW/Sensors/ Introduction to Sensors] from the University of Exeter<br />
<br />
<br />
[[Category:Components]]</div>89.19.172.22