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3rd January 2002, 2:05 PM
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#1 |
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Dream it. Build it.
Join Date: Aug 2001
Location: Baldivis, WA
Posts: 2,398
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OCAU Official Electronics and LCD/Case Modding FAQ (Updated 27/7/05)
Thanks to all of the forum dwellers for their contributions.
Special thanks to looktall for compiling ver 1.0 of the FAQ! This is the Overclockers Australia case modding guide, and FAQ. It's aim is to provide a centalised location for (hopefully) all the answers to your case modding questions, via links to tech sites, and from other OCAU members personal knowledge. Please feel free to add any information you think might be relevant. To make it easier to find what you're after, I've broken it up into various topics. CASE MODDING [H]ard|OCP have changed some links on ya, the links for the case modding faq are http://www.hardocp.com/article.html?art=MTU3 Intro http://www.hardocp.com/article.html?art=MTU4 1&2 http://www.hardocp.com/article.html?art=MTU5 Part 3 case painting + Lightly sanding each coat of paint applied to your case, will give it a smoother, nicer finish. Be careful painting inside your machine using a paint that is "metallic". If the paint flakes you can end up shorting out your mobo if it lands across a data trail. Use only paints that are certified to work on metal ELECTRONIC STUFF (LED, LCD, rheobus/fanbus, etc) how to change case LED how to mod NIC LED how to mod keyboard LED LCD how-to baybus how-to guide to fanbus/rheobus flashing LED PC port pin outs resistor colour codes PC dimensions, pinouts etc  Q: How do I run an ATX PSU without havint it connected to a motherboard? A: Short out the green wire to any of the black wires. typical single LED circuit:  Use the following formula to calculate the required resistor: R = (Vsupply - Vled) / Iled Where: R = required resistor value Vsupply = voltage of the voltage supply (12V, 5V, etc.) Vled = voltage drop of the LED (usually specified in its specifications) Iled = maximum supply current of the LED (also specified in its specifications) Worked example: I have a blue LED from Jaycar (Cat No. ZD1781). Its specifications in the catalogue are Vled = 3.6V and Iled = 20mA I want to connect this to 5V. What resistor do I need? R = (5 - 3.6) / 0.02 R = 70 I need a 70 ohm resistor Ok now how about 4 LEDs in series wired like this:  R = (Vsupply - (Vled1 + Vled2 + .... + Vledx) ) / Iled R = required resistor value Vsupply = voltage of the voltage supply Vled1 = voltage drop of the 1st LED Vled2 = voltage drop of the 2nd LED Vledx = voltage drop of the xth LED Iled = average maximum supply current of the LEDs Worked example: I have 4 blue LEDs from Jaycar this time. Same specs as the afforementioned LED. I want to connect this to 12V. What resistor do I need? R = (12 - (3.6 + 3.6 + 3.6 + 3.6) ) / 0.02 R = (12 - 14.4) / 0.02 R= -120!? A negative resistor?? Obviously there is something wrong. We either need to use the 4 LEDs in parallel as described below, or we need to increase our supply voltage. Let's increase the supply voltage to 24V. R = (24 - (3.6 + 3.6 + 3.6 + 3.6) ) / 0.02 R = (24 - 14.4) / 0.02 R = 480 I need a 480 ohm resistor Ok how about 4 LEDs in parallel like this:  The formula is exactly the same as the single LED example! If we also use the same LED and supply voltage, we will notice that there is 20mA travelling down each branch. Because there are 4 branches the total current required from the supply is 80mA. Why don't we wire LEDs like this?:  Remember that current takes the path of least resistance? The LED with the least resistance will get most of the current whereas the other 3 LEDs will receive a smaller proportion, dpending on their resistance. Note that the resistance of LEDs are around 1 ohm or less. Yes, LEDs are virtually short circuits. Anyway because one of the LEDs is getting more current than the others, it will appear brighter than the others. If it is sucking down a good proportion of the current, it may exceed its specs and then blow. The current will then flow through the next LED of least resistance and probably blow that. Then the next....then the last. what resistor would be required to operate a fan at a certain voltage. Fans are different to LEDs because fans are primarily resistive. Based on this assumption we can use the voltage divider rule to determine the required resistance. If all that sounds like mumbo jumbo, then don't worry I'm going to explain it step by step. The first thing you need to do is calculate the internal resistance of the fan. You can do this if you know any three of the fan's characteristics, power, voltage or current. 1) Rf = Vf^2 / Pf Rf = internal resistance of fan Vf = voltage rating of fan (ie. 12V) Pf = power consumption of the fan 2) Rf = Vf / If If = current consumption of fan 3) Rf = Pf / If^2 Now that you know the internal resistance of the fan, we can calculate the required resistor to bring down the voltage. R = Rf * (Vs - Vo) / Vo R = required resistor Rf = resistance of fan (from previous calculation) Vs = voltage source (eg. 12V) Vo = voltage you want the fan to run at (eg. 7V) Worked example: I have a 12V Sunon fan that draws 6.8W I want to run it from the 12V rail with a resistor so that the fan only runs at 9 volts. What resistor do I need? First calculate the internal resistance of the fan. Rf = Vf^2 / Pf Rf = (12)^2 / 6.8 Rf = 144 / 6.8 Rf = 21 ohms Now to calculate the required resistor. R = Rf * (Vs - Vo) / Vo R = 21 * (12 - 9) / 9 R = 7 ohms I need a 7 ohm resistor. Note the power rating of the resistor must be equal or greater than the fan's rating. In this case, greater than 6.8W Don't use a piddly 1/4W resistor!!! (the above may need editing, with the info provided by cerberos) Voltages from Computer. Molex Connector Yellow 12v+ Black Ground Black Ground Red 5v+ Replacing Case LED's when replacing the power/hdd LEDs for ur case, sometimes there is no need for extra resistors. eg: abit motherboards will take a reading and change the power output to the LED according to what it needs. adding resistors will make an abit board just feed more power to the LED this is confirmed for the abit VP6 and the KR7A-RAID, the variable voltage output thing Places to buy LCD modules. http://www.oatleyelectronics.com/ http://www.jaycar.com.au/ http://www.dse.com.au/ http://www.nollet.com.au/ http://www.dontronics.com/ http://www.rockbys.com.au/ http://www.altronics.com.au/ MISCELLANEOUS STUFF (a little bit of everything) http://7volts.com/ http://www.virtual-hideout.net/ http://www.landfield.com/faqs/pc-hardware-faq/ lots and lots of info here on everything electronic explained in detailed http://www.jaycar.com.au/data1.htm -Video Signal Formats Explained -SIMMs and Other Memory Modules -Understanding & Using CCD Cameras -Common Three Terminal Semiconductors -Design and Make Your Own Hi Fi Speaker Crossovers -Fuses - A Short Primer -Heatsink Basics -Ohms Law, Power In Circuits, AC Waveforms, Power measurement -Measuring AC Voltage and Current etc. -Wiring Diagrams - 240V, Video and Computer Connectors -Polyswitches and Varistors -Relay Driving Basics http://www.jaycar.com.au/data2.htm -Resistor and Capacitor Data -Soldering - How It's Done -Choosing A Replacement Transistor -Units and Conversions -LEDs and Laser Diodes - Care and Feeding -Choosing a Rechargeable Battery -Primary Cells and Batteries -Battery Terms and What They Mean -Variable Resistors or "Pots" -Understanding Decibels -Meter Shunts and Multipliers http://www.jaycar.com.au/data3.htm -Using & Charging Ni-Cad Batteries -Using & Charging SLA Batteries IR Remote Control Receiver LIRC's Schematic and details: - http://www.lirc.org/receivers.html - http://www.lirc.org/images/schematics.gif DSE Part Numbers - IR Receiver IC Z1955 $6.50 - 4.7uF Electrolytic Capacitor R4308 $0.20 - 1N4148 Signal Diode Z3120 $0.06 - 78L05 5V Voltage Regulator Z6108 $1.00 - 4k7 Resistor R1090 $0.02 - 9pin Sub D Plastic Shell P2686 $2.20 - 9pin Sub D Socket P2685 $1.35 Software: - WinLIRC and Winamp Plugin: http://winlirc.sourceforge.net - Girder: http://www.girder.nl Last edited by BlueSmurf; 3rd April 2003 at 9:38 AM. |
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10th May 2002, 12:26 PM
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#2 |
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Dream it. Build it.
Join Date: Aug 2001
Location: Baldivis, WA
Posts: 2,398
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Case Mod FAQ - continued...
OCAU Guides
Case cutting on the cheap http://www.overclockers.com.au/techstuff/a_case_cut/ Installing a 120mm blowhole http://www.overclockers.com.au/techstuff/a_blowhole/ How to sand your CPU slug http://www.overclockers.com.au/techs...d1/index.shtml Fan Splitter (RPM/Power) Cable http://www.overclockers.com.au/techstuff/a_fansplit/ Using an automotive rheostat for fan control http://www.overclockers.com.au/techstuff/a_rheostat/ Huge Link Page of Modding Info Christophers Modding Zone Apple Mac related (not exactly modding, but some electronic stuff - thanks Moldy) http://www.bekkoame.ne.jp/~t-imai/maine.html http://homepage.mac.com/schrier/mhz.html EDIT by Manaz: The URLs were mixed up. Fixed. 
Last edited by Manaz; 25th June 2002 at 12:23 PM. |
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15th June 2002, 5:15 PM
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#3 |
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Member
Join Date: Apr 2002
Location: ACT
Posts: 1,045
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Subscriptions for email newsletters
Give your email address to the below suppliers, and you can receive a free email. Add any other suppliers that you might know about.
NewKits-subscribe@oatleyelectronics.com http://www.strathfield.com/newsletter.asp DICK SMITH https://www.dse.com.au/cgi-bin/dse.s...3/Customer/New TANDY https://www.tandy.com.au/cgi-bin/tan...5/Customer/New |
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16th June 2002, 5:36 PM
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#4 |
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Member
Join Date: Jan 2002
Posts: 295
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http://casemods.pointofnoreturn.org
Couple of different fan controllers that you can build yourself and are much better than their commercial versions. Also contains a couple of led voltmeters |
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24th July 2002, 10:17 PM
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#5 |
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Member
Join Date: Aug 2001
Location: Sydney
Posts: 348
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30th August 2002, 2:01 PM
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#7 |
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Member
Join Date: Aug 2001
Location: Hawthorn.Melb.Vic.Au
Posts: 1,163
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Specifications for flex ATX mobos (also includes some compaitive info for micro and vanilla ATX too). Useful for planning those put-a-system-in-something-tiny mods
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My Vendor Verdict was here |
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4th October 2002, 4:16 PM
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#8 |
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Member
Join Date: Jun 2001
Location: Shepparton, Vic.
Posts: 2,538
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Specifications for VIA's mini ITX Form Factor. It is compatibly with mATX, but is 17cmX17cm.
http://www.viavpsd.com/product/epia_...therboardId=21
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..::imagestore.ugbox.net::.. ..::quotes.ugbox.net::.. "Could we be on the way to that Holy Grail of a busy forum with almost all threads being quality ones?" - Agg "Are you sure its the standard of administration that is declining, or is it the standard of users?" - Baker |
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6th October 2002, 6:28 PM
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#9 | |
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@DDsD
Join Date: Jun 2001
Location: Inner West - Sydney
Posts: 8,924
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From Nitrov8 -> http://www.technick.net/ Every pinout known to man
and all sorts of misc electronics circuits / tips
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7th October 2002, 10:49 PM
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#10 | ||
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Member
Join Date: Jun 2001
Location: Sydney
Posts: 2,277
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Bluesmurf, i have a little update for you. I provided the Jaycar links awhile ago but there are now broken becuase Jaycar updated their site.
Could you please change this: Quote:
Quote:
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FOR SALE: unRAID Server Pro Registration Key $75 There are only 2 reasons why you should run, 1. If you are being chased or 2. If you are on fire Last edited by Odje; 24th January 2003 at 10:12 PM. |
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7th October 2002, 10:55 PM
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#11 |
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Member
Join Date: Jun 2001
Location: Sydney
Posts: 2,277
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i had posted a larger list then this on where to buy electronics parts and LCDs
Quote:
let me see if i have a copy of the list on my hard drive EDIT: i found the list Ricom - http://www.ricomelectronics.webcentral.com.au R.T.Nollet - http://www.nollet.com.au DSE - http://www.dse.com.au Jaycar - http://www.jaycar.com.au Oatley Electronics - http://www.oatleyelectronics.com Altronics - http://www.altronics.com.au Wiltronics - http://www.wiltronics.com.au Dontronics - http://www.dontronics.com Oztronics - http://www.oztronics.com Active Components - http://www.active-components.com.au MicroZed - http://www.microzed.com.au RS Components - http://www.rs-components.com.au Farnell - http://www.farnell.com/australia MicroGram Comptuer - http://www.mgram.com.au Rockby Electronic Components - http://www.rockby.com.au
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FOR SALE: unRAID Server Pro Registration Key $75 There are only 2 reasons why you should run, 1. If you are being chased or 2. If you are on fire Last edited by Odje; 7th October 2002 at 11:01 PM. |
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11th November 2002, 4:38 PM
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#12 |
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Member
Join Date: Mar 2002
Location: Riverton, WA, 6148
Posts: 111
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In western Australia theres a place called Productive Plastics and they will cut you a peice of Perspex out cut to size.
i only got a small peice for my case window. cost $5 which is their minimum Charge Address: Unit 3 65 Buckingham Drive Wangara W.A. 6065 Tel: 9302 2593 Fax: 9302 2594 Mobile: Julian: 0413 048 214 John: 0413 048 063 Website: http://www.productiveplastics.com.au |
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4th December 2002, 9:15 PM
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#13 | |
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@DDsD
Join Date: Jun 2001
Location: Inner West - Sydney
Posts: 8,924
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These links are courtesy of the OC.com modding forums, many many thanks for the heads up
Getting that Mirror finish with a spray can! http://www.pc-workshop.net/articles/...int101-1.shtml The ultimate Dremel guide http://www.jesder.com/ How to do your own window etching! http://www.systemcooling.com/modules...article&sid=85
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4th December 2002, 9:22 PM
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#14 |
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Member
Join Date: Aug 2001
Location: Morley, WA
Posts: 215
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Good site for case windows and laser cutout designs
I found this site while looking for a decent case window design.
http://213.46.29.188/biohaz/?cont=yes feel free to delet the post if u think it's useless but i have noticed some people asking for logos that arent that easy to find at larger sizes. hope it helps Ragz |
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4th December 2002, 11:26 PM
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#15 | ||
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@DDsD
Join Date: Jun 2001
Location: Inner West - Sydney
Posts: 8,924
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Here is a quick 'How to' for running two motherboards off of one PSU
Quote:
Edit: Stymee has written up a more comprehensive How-to with pictures.. (pretty ones at that) which can be found here -> http://forum.oc-forums.com/vb/showth...hreadid=155371
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Last edited by DDsD; 10th January 2003 at 8:16 PM. |
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