OpenCircuits - User contributions [en]

Amiga floppy project

2007-07-19T14:18:50Z

71.234.233.163: congratulations your a moron!

== Amiga Floppy Project ==

This project is the building of an external USB amiga floppy drive controller. It sits between the USB port on a Windows PC, and a regular PC floppy drive. It will allow the PC to create .ADF images from an amiga floppy disk. This device is based on a Parallax SX28 microcontroller, uses Ramtron FRAM memory for temporary track storage, and uses another Parallax component for the USB interface.

[[Image:AFPimage.jpg]]

'''Links'''

[http://www.techtravels.org/amiga/amigablog Main Project Blog]

[http://www.parallax.com/sx/index.asp Parallax SX Microcontroller]

[http://www.ramtron.com/doc/Products/Nonvolatile/Detail.asp?ID=30&gr=5 Ramtron Serial FRAM]

[[Category:Projects]]

User talk:Chazegh

2007-07-19T14:14:31Z

71.234.233.163: Removing ordinary everyday spam

----

Dear Chazegh,

Thank you for starting the Open Circuits wiki.
This has a lot of potential.
--[[User:DavidCary|DavidCary]] 19:37, 31 May 2006 (PDT)

----

Thank you for starting Open Circuits.
I think one of the niftiest things about wiki (in general) is that even when the original person who started a project suddenly disappears -- changing jobs, moving to a different city, touring a distant country, adopting a child, joining a monastery, etc -- that it allows other people to immediately pick up the project, rather than starting from scratch.

So often people say "Wouldn't it be cool to build a ____?", but it never gets built.
Perhaps they even take a few steps,
but then it seems overwhelming.
Wiki allows everyone to share shortcuts, tips, and pitfalls to avoid,
and to improve the plans so they clearly describe exactly how simple it really is.

--[[User:DavidCary|DavidCary]] 07:08, 7 October 2006 (PDT)

Sample Component

2007-07-19T14:10:46Z

71.234.233.163: spam

{{Components|

Description=Here's the description|

Manufacturer=This is the manufacturer|

Footprint=no footprint yet

}}

User talk:Chazegh

2007-07-15T04:08:00Z

71.234.233.163: seriously don't spam usertalk pages.

Samtec

2007-07-15T04:07:07Z

71.234.233.163: Spamtec

{| align=right
|-
|
[[Image:Samtec-logo.gif|Samtec]]
|}

Description: Samtec is a large connector company that is reasonably easy to deal with but their website is pretty convoluted. You can try using their build-a-part wizard, but we recommend you get a paper catalog and thumb through. All their literature is beautiful, too bad their website is so difficult to use.

We buy all sorts of sockets and connectors from them.

On an interesting note, they have no stock. They build everything to order! We ordered some parts with an incorrect/old part #. Upon receiving 100 bad connectors, we attempted to return them. The customer service rep just stuttered on the phone - they don't do returns! Since they build everything to order, they would have no place to even put returned parts. We were SOL. Kind of a cool business model/concept, but just be sure you've got the right part #.

To help you get the right part # - they'll send you all sorts of free samples! Way to go Samtec!

Manufacturer Info: 
[http://www.samtec.com www.samtec.com]

Contact Info: 
1-800-SAMTEC-9 (who still does this? I hate it when companies list some horrible spelled phone number so here's the real number) 
1-800-726-8329

[[Category:Suppliers]]
[[Category:Connectors]]
[[Category:Manufacturers]]

User:Sparkfun

2007-07-15T04:06:24Z

71.234.233.163: spaaaaaaaaaaaaaaaaaaaaaaaaam!

Hey - it's Nate. Leave me a message. Or you can email spark @ spark fun .com. I'm usually working on the [http://www.sparkfun.com sparkfun] site.

Amiga floppy project

2007-07-15T03:56:50Z

71.234.233.163: spamacide

User:DavidCary

2007-07-05T00:06:13Z

71.234.233.163: seriously don't spam userpages.

Welcome to my little corner of Open Circuits.

I think I first stumbled across Open Circuits on 2006-03-01.
I had been starting to set up a electronics-related wiki,
but since this one was already here, why bother?

Feel free to leave a note on [[User_talk:DavidCary|my talk page]].

I created the [[WikiNode]].

Electronic projects:
''(Should I move these to dedicated pages such as [[electronics workbench]], etc.?)''

== electronics workbench ==

What exactly do I need for "normal" electronics development?
I have a pile of stuff, and I have a wishlist of more stuff ...
I hope to document which things are important to have, which things are useful but not immediately necessary, and which things ended up just gathering dust.

== data collection network ==

I'm building a "data collection network" that may end up with hundred of microcontroller sensor nodes,
piping data into a PC.
This may turn into a serious medical diagnosis tool.

== POV display ==

''(moved to [[POV display]])''

== Full-color LED lighting ==

I'm planning to build a silly little toy with 3 LEDs -- one for red, green, and blue --
to show how "additive colors" work (a "color wheel").
(I might just extend it to have a whole spectrum of visible and infrared LEDs, and a prism to show the little spikes in the spectrum that LEDs generate).

"Red, Green, and Blue LED based white light generation"
by Muthu, Schuurmans, and Pashley (2002)
http://www.advancetransformer.com/uploads/resources/LED_White_Light_Issues&Control_-_White_paper.pdf

LED illumination applications
http://en.wikipedia.org/wiki/Light-emitting_diode#Illumination_applications

"How Many Red, Green, and Blue LEDs to make White"
by Don Klipstein 2001
http://members.misty.com/don/ledrgb2w.html

LED Color Shifting
http://hackedgadgets.com/2006/02/14/wireless-led-color-shifting/

== "PC Card" PCMCIA ==

I maintain the
[http://david.carybros.com/html/pc_card_faq.html unofficial PC Card FAQ].

I'd like to move it to a wiki.
What would be the best wiki to put it on?
Open Circuits?

--
DavidCary

== Open Circuits Sysop ==

Whee! I'm a sysop at Open Circuits!
The power -- it's rushing to my head!
--[[User:DavidCary|DavidCary]] 15:20, 23 February 2007 (PST)

User:Sparkfun

2007-07-05T00:03:32Z

71.234.233.163: spam

Hey - it's Nate. Leave me a message. Or you can email spark @ spark fun .com. I'm usually working on the [http://www.sparkfun.com sparkfun] site.

OpenCircuits:Community portal

2007-07-05T00:01:45Z

71.234.233.163: Cool something different this time Viagra linkspam instead of viagra spam!

Welcome to Open Circuits.
This is a good place to talk about Open Circuits, as a whole.

== Anti-Vandalism Bot ==
It is my opinion that this should be the top goal for this site to accomplish.

: ''We recently updated the $wgSpamRegex ( http://www.mediawiki.org/wiki/Manual:%24wgSpamRegex ). It should block nearly all of the kinds of spam we've been seeing in the past. (Use [[Meta:Sandbox]] for testing). --[[User:DavidCary|DavidCary]] 08:46, 6 June 2007 (PDT)''

== electrical mailing lists ==
Yahoo claims they have
[http://dir.groups.yahoo.com/dir/Science/Engineering/Electrical 1,831 electrical engineering mailing lists].
What would be a good way of letting the people on those lists know about the Open Circuits wiki, without spamming them?
--[[User:DavidCary|DavidCary]] 13:30, 31 May 2006 (PDT)

== about Open Circuits ==
So, is there any connection between http://OpenCircuits.org/ , http://OpenCircuits.net/ , and this http://OpenCircuits.com/ wiki?
--[[User:DavidCary|DavidCary]] 23:47, 13 June 2006 (PDT)

No. There is no connection between any of http://opencircuits.com and the other websites listed.
[[User:Chazegh|Chazegh]] 02:55, 18 June 2006 (PDT)
== web rings ==
Document an original microcontroller project and join a PIC webring, or AVR webring. 20 June 2006

== audio electronics ==

Is there some other wiki for people to talk about audio electronics?
Or is this Open Circuits the best wiki for talking about things like
''"[http://analog.com/ Analog Devices] AN-221: The Alexander current-feedback audio power amplifier"'' by Mark Alexander
?

I think I would prefer to offload all the audio electronics controversies to some other wiki
(but which one?).
Still, it would be nice to have some "tips for high-power electronics" here.
I imagine that tips page would list the various quirks of high-power MOSFETs, BJTs, TRIACs, and IGBTs,
and (given a particular motor or speaker or other load)
how to select one over the others,
and various ways of working around those quirks.
--[[User:65.70.89.241|65.70.89.241]] 07:17, 10 August 2006 (PDT)

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.
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?

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?
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.
Aloha, RAF--[[User:66.8.194.185|66.8.194.185]] 14:04, 18 May 2007 (PDT)

== automotive electronics ==

Is there some other wiki for people to talk about automobile electronics?
Or is this Open Circuits the best wiki for talking about things like
[http://megamanual.com/ "experimental Do-It-Yourself programmable electronic fuel injection controller"]?
Or should we just point people who want to talk ECUs (engine control units) to the
[http://msefi.com/ MSEFI discussion forum],
even though it sadly lacks a wiki?
--[[User:DavidCary|DavidCary]] 22:36, 2 July 2007 (PDT)

== inviting bloggers to open circuits ==

=== how to connect a JTAG probe to a Nokia phone ===

I'd like to invite bloggers such as GyrosGeier to edit OpenCircuits.
Rather than just spamming him, I think he would be more inclined to help out
if we answered one of his questions first -- such as
[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."]
Maybe I should start a page on [[JTAG]]...
--[[User:DavidCary|DavidCary]] 09:37, 22 September 2006 (PDT)

The [http://hackedgadgets.com/ Hacked Gadgets blog also has a bunch of cool electronics].
--[[User:DavidCary|DavidCary]] 11:58, 5 January 2007 (PST)

== red links ==

The default skin at OpenCircuits currently has "red links" = page exists, "dark red links" = page does not exist.

I find that confusing. (But not as bad as the wiki that has some links black-on-white, indistinguishable from normal text).

'''work-around''': Register (it's free, and you don't have to give any personal information), then choose the "preferences" link in the far upper-right corner and then pick any other skin.

The other skins have coloring that you may be more used to from other wiki: "blue links" = page exists, "red links" = page does not exist.

--[[User:DavidCary|DavidCary]] 08:58, 18 December 2006 (PST)

== inviting people from other forums to open circuits ==

Lots of people talk about circuits for LED lighting at
http://candlepowerforums.com/
.
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.

== tool lists ==

Should we have an entire page on "tools", and mention it on the main page?
That risks listing *every* tool anyone has ever heard about,
like the page at
http://massmind.org/techref/tools.htm
.
Yes, I'm responsible for uglier bits on that page;
I think the wide variety of oscilloscopes are particularly confusing.
How could we cut through the confusion?

I see the "techniques" page already has a list of software tools.
Perhaps it would be nifty to have a short list of all the tools necessary for each technique?
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?"'').

--[[User:DavidCary|DavidCary]] 08:37, 24 January 2007 (PST)

== Requests For Help ==
Is there any way to ask for wise persons to write an article? I want to know about microphones for my Cannon Elura 100, (9V 3mm stereo jack? Where does the 9V come from?) and XLR mics and circuts. How can I make a mixer and a USB interface? Can we get an alert system to notify a requestor when the request is filled?

[[User:Negatron|Negatron]] 18:00, 20 February 2007 (PST)

: Yes, it's easy to start a rough draft of a new article.
: There are at least 2 "alert systems" built into MediaWiki.

: Alas, it takes time to convert that rough draft into a useful page of information.
: Near the bottom of page http://www.communitywiki.org/en/DavidCary , I whine about how difficult it is to force really smart people to talk about what *I* want them to talk about. :-/

: We are all volunteers here.
: Would you mind writing a little more about your "Cannon Elura 100"? Perhaps you could snap a "zoomed out" photo of the whole thing, and a "zoomed in" detail photo of its jacks and connectors. Then upload those photos?

: I'm a little confused at exactly what you want.
: Do you want a USB interface to your digital video camcorder?
: So you can ... what? plug in a USB mouse?
: If you make a rough draft of an outline of the article you want, with lots of "..." gaps to show the gaps in your knowledge you want to fill, it's a lot easier for people to fill in the "..." gaps.

: Do any of these XLR microphone circuits work for you?
* [http://www.epanorama.net/circuits/microphone_powering.html "Powering microphones" ] by Tomi Engdahl 2000
* [http://www.oldbird.org/mike_home.htm recording in-flight bird calls: "Microphone design and building instructions" ]
* [http://www.rcrowley.com/CamAdapt.htm "Microphone Adapters for consumer camcorders"]

: --[[User:DavidCary|DavidCary]] 11:01, 6 March 2007 (PST)

== sample component ==

What is the purpose of the [[Sample Component]] ?
--[[User:DavidCary|DavidCary]] 16:27, 7 May 2007 (PDT)

----

== current surge and battery life ==

Hi,

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.

Will this surge affect my battery life? If I use a supercapacitor does it helps?

-- [[User:203.120.164.208]] 04:14, 30 April 2007

== MIDI electrical interface ==

In my opinion, the MIDI interface got a lot of things right that too many later interfaces still trip over.

* http://www.repairfaq.org/filipg/LINK/F_MIDI.html -- ASCII schematics
* http://www.engadget.com/2005/08/30/how-to-control-csound-with-a-custom-midi-controller-hardware/ -- hand-sketched schematics
* http://www.midi.org/about-midi/electrical.shtml "MIDI Electrical Specification Diagram & Proper Design of Joystick/MIDI Adapters" -- well-drawn schematics
* [http://en.wikipedia.org/wiki/The_MIDI_1.0_Protocol Wikipedia: The MIDI 1.0 Protocol]
* http://en.wikibooks.org/wiki/Behringer_FCB1010_MIDI_Pedal

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.

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?

I would be most interested in discussing new communication interfaces -- but is this really the right wiki?
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?
--[[User:DavidCary|DavidCary]] 13:21, 21 June 2007 (PDT)

== IC design ==

What do you think about
http://makeyourownchip.com/
?
Should we talk about VLSI design ([http://david.carybros.com/html/vlsi.html "VLSI: designing electronic chips"])
here at Open Circuits?
Or is there a more appropriate wiki somewhere else?
--[[User:DavidCary|DavidCary]] 15:59, 26 June 2007 (PDT)

== electronics infoline ==

So have you seen
"Free electronics projects"
http://electronicsinfoline.com/
"with Photo Preview"
?
--[[User:DavidCary|DavidCary]] 00:28, 1 July 2007 (PDT)

== generating a netlist with a "C++" program ==

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].

How did they do that?
--[[User:DavidCary|DavidCary]] 01:15, 3 July 2007 (PDT)

Open Mobile Gadgets

2007-07-01T15:41:15Z

71.234.233.163: No we don't want xanax ringtones here.................................................................................................................................................................,..

This is a description of a project to create an open software, open hardware mobile communications device. Initial iterations will be very simple, but will progress to having full smartphone-like functionality and beyond.

== The Open Mobile Gadgets Architecture ==

Here's a quick block diagram of the device that I want to build. More details to come about the specific hardware implementation.

[[Media:Open Gadgets Architecture.pdf|Open Gadgets Architecture (Block Diagram)]]

If you're interested, contact me (chazegh @ flashmob.com).

--
[[User:Chazegh|Chazegh]] 14:12, 26 January 2006 (PST)

== the Open Phone ==

: Is this the same as the "Open Phone" ?
:: [http://www.oreillynet.com/pub/a/etel/2006/09/05/the-complete-open-phone.html "The Complete Open Phone"] by Matthew Hamrick, 2006-09-05
:: ''("Matthew Hamrick is the co-founder of the Silicon Valley Homebrew Mobile Phone Club ... Matthew ... proposes a truly open mobile phone platform.")''
: Even if it is not, would it be a good idea to join forces, share resources, etc. ?
: Is it really possible to build a cell phone with "reasonable" weight and battery lifetime using mostly generic hardware (a FPGA, a Kilocore, off-the-shelf ADCs and DACs, etc.) and lots of software, rather than hard-wiring everything with custom hardware?
: ... See [http://en.wikipedia.org/wiki/Software-defined_radio wikipedia:Software-defined_radio] ...
: --[[User:DavidCary|DavidCary]] 13:01, 24 September 2006 (PDT)

* Nope... this isn't the same as the "Open Phone" stuff I'm doing.
: But... "Complete Open Phone" is more of a concept than a project really. So if you're designing mobile-phone like hardware that you release with an "open" license like [http://creativecommons.org/ Creative Commons] or [http://www.gnu.org/copyleft/gpl.html Gnu Public License], to be used with "open" mobile phone software like [http://familiar.handhelds.org/ Familiar Linux] or [http://libgsmc.sourceforge.net/ LIBGSMC], then you're doing the same thing I'm talking about.
: I'm the first person I know who's called for opening up hardware and software for mobile devices. I hardly belive I'm the first person to come up with the idea, though. It's a good idea and given the number of highly capable geeks out there, it's an idea that you won't be able to put "back in the box." In other words... "Complete Open Phone" is just the name I came up with for a "movement" that I and other people have been working on (people like [http://surjpatel.com/ Surj Patel] (who runs [http://opencellphone.org/ the Open Cell Phone] site.), [http://www.seattlewireless.net/~casey/ Casey Halverson] up at Seattle Wireless, and Nathan and all the gang at [http://sparkfun.com/ SparkFun].) And now that I've finally browsed over here, I can tell other people that the "Open Circuits" community are also interested.
: Some of us at the [http://hbmobile.org/ Homebrew Mobile Phone Club] are (in our copious spare time) designing and building "open" phone designs. We're more interested in building phones than web-pages, unfortunately. But, I'm hoping to have the time over the holidays to post a few pictures and designs. You'll find more information at the [http://hbmobile.org/wiki/ Homebrew Mobile Phone Club Wiki] and we'll probably post instructions at the [http://www.instructables.com/ Instructables web site]. Heck, we'll probably also post some designs here, that what it seems to be setup for.
: --[[User:msh|msh]] 07:41, 18 December 2006 (PST)

* I'm interested in putting together an open phone too, but I'm more into a basics first-grow later using the GSM Module from Telit, the GM862-GPS. My idea is to use just the module by itself, code in a very basic "operating system" using the module's python capabilities, and a Nokia LCD that they have in sparkfun. I wish to buy this module because I think that every cellphone should have GPS capabilities even if it's an add-on. I also like this module because you can use it from the start without a lot of external components (it's got a battery charger, IIC, SPI interfaces, AT Command set, integrated SIM reader, etc etc).
: I *do* have a problem to create the PCB and buy/place some of the components, so, would any of you guys interested in collaboration with this project ? I can come up with the initial desing/PCB and we can go from there. One of the ideas is to have the module as an add-on to the Palm TX pda. I intend to use a gumstix later on too maybe (if I don't go the TX way). Let me know if you're interested. BTW, shouldn't a *discussion* on this page be more interesting ?
: --[[User:Diogownunes|Diogownunes]] 08:36, 18 December 2006 (PST)

* Yup... we probably should move this stuff to the discussion page. I have one of the Python enabled modules, but I've got to admit, I never thought to use its capabilities. I'm currently developing a "build your own SMT prototype board" course for the [http://techshop.ws/ TechShop], and I'm also going to post some of it at [http://instructables.com/ Instructables]. It's likely not going to be ready until mid-January, though. I don't know that I can help too much more than that, though. One of the things I'm currently working on is the "[http://www.hbmobile.org/wiki/index.php?title=Albion_Project Albion]" phone. It's a successor to TuxPhone. When the design and debugging is finished, I'm going to post everything to the web and possibly make a few boards that are populated with the SMDs (so the only thing you have to add is a power brick, telit module, gumstix, keypad and LCD.

== OpenMoko ==

According to [http://openmoko.com/press/ this press release], "2006.11.7: OpenMoko Announces the World’s First Integrated Open Source Mobile Communications Platform"
The [http://openmoko.org/ OpenMoko Development Community Server] looks like it's not quite online yet.
[http://www.freesoftwaremagazine.com/blogs/iphone_vs_openmoko_free_software_on_your_cell_phone someone else writes about OpenMoki].

== TuxPhone at OpenCellPhone.org ==

http://opencellphone.org/ is a wiki.

== alternate keyboards for mobile phones ==

Near the end of
[http://www-static.cc.gatech.edu/fac/Thad.Starner/p/030_10_MTE/twiddler-novice.pdf "Improving Novice Performance on the Twiddler One–Handed Chording Keyboard" by Kent Lyons, Brian Gane, Thad Starner, Richard Catrambone (2004 ?),
there's a picture of a prototype mobile phone design that has slighly-modified keys to enable much more rapid text-messaging.

If an adequately open-source mobile phone were already available, these people could have already tweaked the software and be using their proposed technique already.
Rather than speculating that it "seems to be a viable mechanism for text entry on future mobile devices".

What is the best way to start collaborating with alternate-keyboard people?

[[Category:Projects]]

Integrated Circuits

2007-07-01T15:34:47Z

71.234.233.163: Spam

== Digital Potentiometers ==
[[Digital Potentiometers|Digital Potentiometers(AD5204)]]
The digital Potentiometers made by analog devices (AD5204) has 255 positions can be adjusted by the microcomputer that can receive commands from the computer. This is a great way for analog circuitry to have digital control. This is a chip with 4 digitally controlled POTs and the pots can be daisy chained to have multiple chips controled by a single SPI interface.

== Voltage Regulators ==
{|
! colspan="2" align="left"| Linear Regulators
|-
| align="center"|[[Image:Main-LT1528.jpg|69px|LT1528]] [[LT1528]]
| High current, Variable Voltage Regulator
|-
| align="center"|[[Image:TPS-V-Reg.jpg|69px|TPS V-Reg]] [[TPS V-Regs]]
| These are 3.3V and 5V LDO, Low-Noise Voltage Regulators. Very small SOT-23 SMD package. 150mA max current. Best used in battery applications.
|-
| align="center"|[[Image:Main-LM7805.jpg|69px]] [[Basic Voltage Regulators]]
| Variable voltage regulators, set output regulators, we give you the whole breakdown. Perfect for use with an external wall-wart power supply.
|-
| align="center"| [[Image:UA723CN_Symbol.gif]] [[The 723 Voltage Regulator]]
| Precision Voltage Regulator. Can be used as fixed or floating, variable, linear or switching.
'''NOTE:''' Only the DIP-14 version (image) has the Vz pin, which is used for negative regulators. The Metal Can and the Flat-Pack do not have enough pins so exclude the Vz.
|-
|  
|-
! colspan="2" align="left"| Switching Regulators
|-
| align="center"| [[Image:MCP1253-ADJ.png|69px]] [[MCP1252/3]]
| Extremely Efficient, 120mA Flyback Switching Regulators.
|-
|}

== Microcontrollers ==

* [[Image:lpc2103.jpg|69px|LPC2103]] [http://www.k9spud.com/arm/lpc2103/ LPC2103] Low cost 70MHz ARM7TDMI-S FLASH Microcontroller from Philips. The [http://coridiumcorp.com/arm7/ "$49" "Coridium ARMmite"] does use this chip.
* [[Atmel]] AVR 8 bit FLASH microcontrollers
* [[Microchip]] PIC 8 bit FLASH microcontrollers
* Microchip dsPIC 16 bit FLASH microcontrollers ( [[DsPIC30F 5011 Development Board]] )
* Cypress PSoC 8 bit FLASH microcontrollers

''I've written a little about the various kinds of microcontrollers at [http://en.wikibooks.org/wiki/Embedded_Systems/Particular_Microprocessors Wikibooks: Embedded Systems]. --[[User:DavidCary|DavidCary]] 06:15, 10 March 2007 (PST)''

== Op Amps ==

Op amps and instrumentation amps.

[[op amp]]s: great for amplifying weak signals from [[sensors]] to a more useful level. Also used in filters, integrators, etc.

* [[LT1168|LT1168 Programmable-Gain Precision Instrumentation Amplifier]] - Low Power, Single Resistor Gain Programmable, Precision Instrumentation Amplifier
* [[LT1114|LT1114 Low Power Precision OP-Amps]] are used for amplification and filtering of the signal - Dual/Quad Low Power Precision, Picoamp Input Op Amps

* [http://en.wikibooks.org/wiki/Electronics/Op-Amps Wikibooks:Op-Amps] has a "quick design process" using Daisy's theorem: ''"The sum of the gains = +1 in a properly-designed op amp circuit."''

* [http://ciphersbyritter.com/RADELECT/PREOPAMP/OPAMPDSN.HTM "Some Op Amp Audio Design Issues"] by Terry Ritter

== logic gates ==

* NAND gate: [http://www.coprolite.com/art48.html "Using a NAND Gate for a Set/Reset Latch"] (the 74HC132 Schmitt-trigger quad NAND is better than the 74HC00 quad NAND).
* [http://people.freenet.de/dieter.02/alu_4.htm "Multiplexers: the tactical Nuke of Logic Design"] by Dieter Mueller 2004 (74153)

There are hundreds of other specialized logic gates. Here we only list the ones we actually use in some Open Circuit [[Projects|Project]]:

* 74HC595 eight bit shift register with output latch (used for POV display)

== RF ICs/Modules ==

[http://www.linxtechnologies.com/ Linx Technologies] makes several low power RF transmitter/receiver chips. Their range is around 500' - 1000'. They are geared for one way communication only, like keyless entry systems. They also make several serial encoding chips that make the wireless communication more secure/crack proof. Their latest chip, the HS series, is based upon the SkipJack algorithm developed by the NSA.
[[Category:Components]]

Category:AFD

2007-06-27T20:40:15Z

71.234.233.163:

articles for deletion.--[[User:71.234.233.163|71.234.233.163]] 13:40, 27 June 2007 (PDT)

WikiNode

2007-06-23T18:32:32Z

71.234.233.163: spamacide

Welcome to Open Circuits.
Open Circuits is a wiki for sharing electronics knowledge, schematics, board layouts, and parts libraries.

== key points of interest ==

* [[Main Page]]
* [[Open_Circuits:Community_Portal]]
* [[Projects]]
* [[Components]]
* [[Techniques]]

== wiki-nodes of neighboring wiki ==

* [http://hcvl.hci.iastate.edu/cgi-bin/openEyeswiki/index.cgi the openEyes wiki] discusses an open-source open-hardware toolkit for low-cost real-time eye tracking.
* [http://wiki.asiaquake.org/openeeg/published/WikiNode the OpenEEG wiki] discusses building an OpenEEG, safe ways to attach it to your head, and software for it.
* [http://communitywiki.org/odd/ComputerComponent/WikiNode Computer Component wiki] "for computer and electronics enthusiasts to learn and contribute to an online database of computer hardware and electronics with an emphasis on how-to guides."

* [http://nslu2-linux.org/ the NSLU2-Linux development group] seems to do a lot of wiring and soldering. ''needs wiki-node''
* [http://wikidevices.org/ Wiki Devices] "a highly organized repository for objective information, as well as opinions on consumer electronics."
* [http://wikiindex.com/Build_Your_Own_Arcade the Build Your Own Arcade controls wiki]
* [http://www-robotics.usc.edu/~dshell/roboticswiki/ Robotics wiki]
* [http://geda.seul.org/wiki/ the gEDA wiki] discusses "the gEDA project" -- developing a full GPL‘d suite of Electronic Design Automation tools (electrical circuit design, schematic capture, simulation, prototyping, and printed circuit board (PCB) layout.
* microcontroller wiki:
** [http://gainer.cc/wiki/ the Gainer wiki] discusses the Cypress PSoC microcontroller
** [http://avrwiki.com/ the Atmel AVR wiki] discusses the Atmel AVR series of microcontrollers
** [http://techref.massmind.org/techref/piclist/ the PICList at the massmind] and [http://oase.uci.kun.nl/~mientki/wikifarm/stef/index.php PiciWiki] discusses the Microchip PIC series of microcontrollers
** [http://www.open-research.org.uk/ARMuC/ the ARM microcontroller wiki]
* [http://en.wikibooks.org/wiki/Embedded_Systems the Embedded Systems wikibook]
* [http://sensorwiki.org/ the sensor wiki]
* [http://linuxtv.org/wiki/ the LinuxTV wiki] occasionally has some chip-level information, such as the [http://linuxtv.org/wiki/index.php/I2c_Protocol I2C protocol] and [http://linuxtv.org/wiki/index.php/BT878 sampling analog data at 16 bits and 448000 Samples per second with a BT878 chip]
* [http://howto.wikia.com/wiki/WikiNode WikiHowto] occasionally has electronic projects such as [http://howto.wikia.com/wiki/Howto_build_an_ultra_low_power_clock_with_a_large_period WikiHowto: Howto build an ultra low power clock with a large period]
* [http://wiki.duskglow.com/ The Open Graphics Project (OGP) is developing graphics cards with fully published specs and open source drivers.] Since the first version will be a FPGA, is also collecting information on FPGA programming and interfacing.
* [http://elinux.org/ the embedded Linux wiki] has information on running Linux on several small ARM-based embedded systems. Also TexasInstruments OMAP processors.
* [http://wikihost.org/wikis/openhardware/ the Open Hardware wiki] has electronics projects of various levels of complexity; the most complicated appears to be "KAD", a FPGA on a PCI card designed for reconfigurable computing.
* [http://pminmo.com/wiki/ the PMinMO.com wiki] describes an open-source CNC machine -- software, electronics, motors, hardware, etc. -- and related information, such as [http://pminmo.com/wiki/index.php?title=CNC_PCB_Milling CNC PCB milling]. ''needs WikiNode''
* [http://linuxrobots.org/ Linux Robots] ''needs wikinode''
* [http://protel-users.org/ Protel users wiki], for people who design and draw schematics and circuit boards with Protel.
* [http://balloonboard.org/balloonwiki Balloonboard Wiki] for the Balloon Project. They have developed a small single-board computer that can run Linux. Also discusses "The Balloon Open Hardware License (BOHL) ... The license is intended as a general purpose open hardware license".
* [http://elinux.org/wiki/ embedded Linux wiki] ''needs wikinode''
* [http://vems.hu/wiki/ VEMS wiki] has some interesting electronics projects. In particular, the [http://www.vems.hu/wiki/index.php?page=GoBox GoBox project] to tune automobile engines to minimize the amount of fuel used. ''needs wikinode''
* [http://wiki.twibright.com/ a wiki for RONJA] (Reasonable Optical Near Joint Access) Free Space Optics device[http://en.wikipedia.org/wiki/RONJA]. ("free technology" is the same as "open hardware", right?)
* [http://docwiki.gumstix.org/ gumstix wiki] : "[http://docwiki.gumstix.org/Schematics Schematics and layouts for all gumstix expansion boards] are available under a Creative Commons license." ''needs wikinode''
* [http://openjtag.net/ the OpenJTAG wiki] ( http://openjtag.net/ )
* [http://reprap.org/bin/view/Main/WebHome the RepRap wiki] discusses the RepRap project to build a "Replicating Rapid-prototyper", a self-copying 3D printer. "Complete open-source instructions and plans are published on this website for zero cost and available to everyone so, if you want to make one yourself, you can."

----

Please add closely-related wiki. Keep the 7 or so of the most-closely-related wiki.
Move less-relevant wiki to WikiIndex.

''Are any of the wiki listed at http://www.communitywiki.org/odd/SoftwareBazaar/MicrocontrollerProgramming relevant enough to list here?''

WikiNode

2007-06-23T01:39:34Z

71.234.233.163: as before...

User talk:210.16.47.7

2007-06-23T01:38:53Z

71.234.233.163:

Seriously, don't spam Articles --[[User:71.234.233.163|71.234.233.163]] 18:38, 22 June 2007 (PDT)

User talk:210.16.47.7

2007-06-23T01:38:21Z

71.234.233.163:

無為--[[User:71.234.233.163|71.234.233.163]] 18:38, 22 June 2007 (PDT)

User talk:Sparkfun

2007-06-23T01:30:49Z

71.234.233.163: You're annoying me now

Hey - things I'd like to see:

Number of items in a specific category next to the category. For instance:

(13) Passives - Picture 
Capacitors, Resistors, etc

The navigation bar on the left side has many problems: 
Get rid of donations, random page, recent changes, current event, and potentially community portal. Help is good, but should be called 'What is this place?'. 
We really need a nav tree for everything. I want to 'shop' around instead of just click forward and backward.

: Don't get rid of [[Special:RecentChanges|Recent Changes]], IMHO, it's important for people to be able to figure out what's going on on a wiki. --[[User:Wiml|Wiml]] 21:02, 5 February 2006 (PST)

Yea - you're right. But I'd still like to see some sort of navigation tree.

''Yes, navigation is good. Certainly we need to get rid of the sidebar links that go to a "page" that doesn't yet exist. But some people say "tree" is overrated. http://communitywiki.org/HierarchyConsideredHarmful , http://communitywiki.org/AlternativesToHierarchy . --[[User:DavidCary|DavidCary]] 07:34, 11 May 2007 (PDT)''

----

Moments ago I made the article [[SparkFun]] redirect to your user page.
Want to slap a "sparkfun electronics" logo on your user page?
That would make it parallel to the [[Mouser]] and [[Samtec]] and the others listed as [[supplier]] or [[manufacturers]].

Or would you prefer to have a [[SparkFun]] page dedicated to the company, completely independent from the [[User:Sparkfun]] page dedicated to you as a person?
--[[User:DavidCary|DavidCary]] 07:34, 11 May 2007 (PDT)

Molex

2007-06-23T01:29:11Z

71.234.233.163: Seriously, don't spam Articles

{| align=right
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[[Image:NoImage.jpg|NoImage]]
|}
Description: Molex is a large connector company. They do sample connectors with just a log-in but they really only sample connectors that have in stock.

Manufacturer Info: 
[http://www.molex.com www.molex.com]

Contact Info: 

[[Category:Connectors]]
[[Category:Manufacturers]]

Relays

2007-06-23T01:28:12Z

71.234.233.163: Whoa-oh-oh-oh. Stop! Spammertime!

{| align=right
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[[Image:Main-G5Q-14.jpg|Relay]]
|}
Description: A PIC can't source more than 25mA, so how do I turn on/off a light bulb? With a relay!

Relays are those large black boxes that go 'click'. There is a coil inside. When current flows through the coil a magnetic field causes the the internal paddle to move postions. This paddle usually carrys large currents or large voltages.

Most relays have various ratings. We'll start with the coil voltage. '12VDC' for example means that the control coil requires 12V DC for the unit to switch the paddle. The other rating you'll see is '10A'. This refers to the amount of current you can run through the control paddle contact (''not'' the current through the coil). So a 10A relay can handle a load of up to 10A- less than 10A is no problem. What happens if you try to run more current than the max? Well, it will probably work, but at higher currents the internal sparking will tend to burn the contacts. The paddle can potentially spot-weld itself to the contacts in extreme cases.

There are sealed and vented relays. Vented relays tend to run a bit cooler, but are more suceptible to gunk getting into the moving parts.

There are many configurations based on the circuit you need to control. DPDT (double pull double throw), SPDT (single pull double throw) are two of the most common. View the equivalent circuits in the mfg's datasheets to get an idea of how they work.

Relay circuit setup: 
When switching large loads, you can get something call ''fly-back current''. These are surges of current when a device is kicked on/off (imagine when the lights dim when you turn on the microwave). Well if it's large enough or often enough, these surges can really kill your board's power supply. The fly

[[Image:Relay-Example.jpg|Example Relay Circuit]]

Many microcontrollers cannot source enough current to feed the control coil. So Q1 is any old BJT (2N3904 is a good one) to turn on/off the relay. The diode 1N4148 (simple, cheap, can handle ~200mA current) is there to supress any fly-back current from entering the main power supply. Be sure to watch how you polarize your diode.

Documents: 

Footprints: 
[[SFE_Footprint_Library|SFE Footprint Library]]

There are various footprints available. Always be sure to do a 1:1 printout of your board and matchup the physical relay to the printout before PCB fab. Sometime the manufacturers list recommended footprints from the bottom view which can lead to mirrored and incorrect FPs.

Manufacturer Info: 

Supplier Info: 
Digikey part # : G5Q-1-DC12 
Single Piece Price : $2.25

Related Items: 

[[Category:Components]]

Template:Components

2007-06-23T01:26:56Z

71.234.233.163: Spam. HAPPY NOW?!)

{{{Description}}}

[[Image:partimage.jpg|Part Image]]

Talk:Components

2007-06-23T01:24:10Z