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> My Sl-5500 Security Tool!
zacklau
post Mar 8 2006, 01:59 AM
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Here is my mod of my zaurus! It has a external antenna plug and extra 10000mAh battery for long lasting. cool.gif
Here is some pics.
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Da_Blitz
post Sep 2 2006, 05:20 AM
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actually if you put a heatsink on the 7805 it will do more than 1A, the thing has a thermal shutdown and will turn off hen it gets to hot (VERY hard to blow up) the cooler it runs the better the regulation, so feel free to exceed the specs, there is slack alread built into them, looking at the calculations below it looks like the 7805 can do 3A if you folleow the advice bellow

if i remeber correctlly the 323 is a varible regulator, if it is the only diffrence between it and the 7805 is that the 7805 has a preset output voltage, apart form that they should be identical

i wouldnt order the parts, these are common hobbiest parts that can be bought off the shelf

bluetack is a bluish and silghtly sticky type of clay that is bought in strips and normally used to attach paper or posters to walls, dosent leave a mark when pulled off the wall and is also good at keeping water out to a certin degree

there might be a bit of confusion with the LM parts, the LM parts are made by linear devices and they do tend to name the regulators a bit diffrent even thogh they are drop in replacment parts, try finding a data sheet for a 7v-24v in regulator, 5v out and see if the naming is simmilar to the 7805

you only need a heatsink if you disipate more than 1 watt, and then its only rule of thumb, if you use a metal case then it would make sense to screw the regulator to it as you will then ground the case and be able to use it as a heatsink

the formula you need is (Vin -Vout)/current so for 7.2v in and 5v out at 3 A you get 2/3 of a watt which is within specs but i would attach it to the case just to be sure

if you are going to run USB hard drives off of it then i would recomend some 16v electrolitic capaciotrs on the output, AND in parrallel to the USB connector of each socket, this is beacuse the surge current can cause the hub to reset and capacitors will help prevent this, 10uF should be enough but the higher the better, it depends on how big the case is (if you have a mix of values put the big capacitors on Vout first, followed by the usb ports then Vin, so Vin should have the smallest (the battery should be able to handel itself)

luckily over hear the local electronics shops give you a CD with data sheets of all the parts they sell, coupled with begale (search egine simmilar to google search for linux) it makes finding data easy, not to mention i have a 1:1 image of alot of manufacturers websites on my hard drive so if you need a part i should be able to help out (its up to 15GB of PDF files now!!!)
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zacklau   My Sl-5500 Security Tool!   Mar 8 2006, 01:59 AM
SlackwareLinux   What wireless card are you using in that picture?   Mar 8 2006, 05:45 PM
xamindar   Nice! Did you build your own battery pack? W...   Mar 8 2006, 05:49 PM
zacklau   I moded my WCF-12, Then I builded a battery with a...   Mar 12 2006, 03:20 AM
SlackwareLinux   QUOTE(zacklau @ Mar 12 2006, 03:20 AM)I moded...   Mar 12 2006, 05:41 PM
Legodude522   QUOTE(zacklau @ Mar 12 2006, 07:20 AM)I moded...   Oct 22 2006, 03:30 PM
db2guru   QUOTE(zacklau @ Mar 8 2006, 09:59 AM)Here is ...   Mar 17 2006, 11:23 AM
telemetric_au   can you run your cf wifi now without the antenna ?...   Apr 5 2006, 01:09 AM
zacklau   yes it can run without the antenna, but the signal...   Apr 24 2006, 10:26 PM
telemetric_au   QUOTE(zacklau @ Apr 25 2006, 05:26 PM)yes it ...   Apr 25 2006, 04:13 AM
dlichterman   Hey what are the details on that battery......im i...   Aug 21 2006, 11:51 AM
dlichterman   Extra battery? Ok I found this thing laying aroun...   Aug 29 2006, 04:15 PM
Drake01   QUOTE(dlichterman @ Aug 29 2006, 07:15 PM)Ext...   Aug 29 2006, 07:48 PM
Da_Blitz   careful, the common 7805 dosnt provide regulation ...   Aug 30 2006, 05:34 AM
Drake01   QUOTE(Da_Blitz @ Aug 30 2006, 08:34 AM)carefu...   Aug 30 2006, 04:27 PM
dlichterman   Right see if i use MiMh @ 1.2V would that work   Aug 30 2006, 01:00 PM
Da_Blitz   all you need is a 3 pin regulator, one pin is Vin ...   Sep 1 2006, 05:53 AM
Drake01   QUOTE(Da_Blitz @ Sep 1 2006, 08:53 AM)all you...   Sep 1 2006, 12:49 PM
Da_Blitz   actually if you put a heatsink on the 7805 it will...   Sep 2 2006, 05:20 AM
Da_Blitz   just found out i can get thin RC plane battery pac...   Oct 24 2006, 06:51 PM


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