Bonefarm

100 Watt sub woofer amplifier. - Electronic Circuits and Diagram-Electronics Projects and Design

2013-07-07T00:32:00.001-07:00

100 Watt sub woofer amplifier. - Electronic Circuits and Diagram-Electronics Projects and Design:

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Electronic Projects for Musicians Craig Anderton 1980

2013-02-25T20:05:00.001-07:00

This is where it all began............... :)

Software Defined Radio

2012-12-23T12:54:00.003-07:00

Software Defined Radio:

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Software Defined Radio

2012-12-23T12:54:00.001-07:00

Software Defined Radio:

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EchoLink®

2012-12-23T12:53:00.001-07:00

EchoLink^® software allows licensed Amateur Radio stations to communicate with one another over the Internet, using streaming-audio technology. The program allows worldwide connections to be made between stations, or from computer to station, greatly enhancing Amateur Radio's communications capabilities. There are more than 200,000 validated users worldwide — in 162 of the world's 193 nations — with about 5,000 online at any given time.

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CompTIA Linux+ Certification Info

2012-12-23T01:03:00.001-07:00

Two exams are necessary to be certified: LX0-101 and LX0-102. LX0-101 covers system architecture; Linux Installation and package management; GNU and Unix commands; devices, Linux filesystems, and filesystem hierarchy standard. LX0-102 covers shells, scripting and data management; user interfaces and desktops; administrative tasks; essential system services; networking fundamentals; security.

A new benefit for CompTIA Linux+ Powered by LPI candidates is that they may choose, at the time they take the exams, to have their exam record forwarded to the Linux Professional Institute. Certification in CompTIA Linux+ Powered by LPI, attained by passing CompTIA exams LX0-101 and LX0-102, enables candidates to become certified in LPIC-1 as well, enabling further participation in the LPI program if the candidate chooses. Please note that CompTIA maintains candidate-confidential records for all exam takers, for their own access and use for employment or educational purposes. Any choice to forward an exam record to LPI is made only by the candidate.

Candidate job roles include junior Linux administrator, junior network administrator, systems administrator, Linux database administrator and web administrator. Companies such as Dell, HP, IBM, Lenovo and Xerox recommend or require CompTIA Linux+.

Top Ten Mac OS X Tips for Unix Geeks

2012-12-23T00:43:00.001-07:00

Published on MacDevCenter (http://www.macdevcenter.com/)
See this if you're having trouble printing code examples

by Brian Jepson
05/15/2007 Editor's Note: We noticed that this five year-old article continues to get a lot of attention, so we recently asked Brian Jepson to update the sections that have become dated. Here's his update of this "oldie but goodie."
It's been a few years since the release of the book I co-wrote with Ernie Rothman, Mac OS X for Unix Geeks, and I see that a few things have changed since I originally offered the top 10 tips that I gathered while working on the book. These tips will show you the differences between Mac OS X and other flavors of Unix; help you find the bits that resemble the Unix you are used to; and even feather your nest with ports of popular open source applications.

1. Where's My Shell?

A Unix geek won't get too far without a shell, right? You can find the Terminal application by navigating to /Applications/Utilities in the Finder. Drag the Terminal application to your dock so you can access it quickly.
When you start up the Terminal, you'll be greeted with the default user shell, ~~tcsh~~bash. You can customize the Terminal's appearance and settings by selecting Window Settings from the Terminal menu. You can set the startup shell by selecting Preferences from the Terminal menu.

2. Sudo, Not Su

By default, the root user is disabled on Mac OS X. If you need to do something as root, use the sudo command. To use this command, pass in the command and arguments you want to execute, as in: sudo vi /etc/hostconfig. You'll need to be a user with Administrative privileges. The main user has this capability by default.
If you need a root shell, you can always use sudo tcsh or sudo bash. If you want to enable the root user, it's as simple as giving root a password with sudo passwd root. You'll also want to open System Preferences, choose Accounts, then Login Options and change Display Login Windows as: to Name and password. Then you can log out and log in as the root user.

To get compilers and many other development tools, you'll need the Mac OS X Developer Tools. If you bought the boxed version of Mac OS X, the Developer Tools should be included on a separate CD-ROM. If you bought a new Macintosh that came with Mac OS X preinstalled, the Developer Tools installer will probably be in /Applications/Installers. Failing either of those, or if you'd like to get the latest version of the tools, they are available to Apple Developer Connection (ADC) members.

3. Startup

Mac OS X startup is nothing like other Unix systems. Most significantly, Mac OS X has nothing like the /etc/init.d directory. Instead, it finds its startup items via ~~/System/Library/StartupItems (for system startup items) or /Library/StartupItems~~ the launchd startup program. You can read all about it in this ADC article.

4. Filesystem Layout

If you open up a Finder window to the top-level of your hard drive, you'll see that familiar friends like /var and /usr are missing. They are actually hidden (more on that later). If you open up a Terminal shell and do an ls /, you'll see the missing folders, as well as a few others, such as /Library and /Developer.
The following table lists some of these folders that you'll see (Appendix A of Mac OS X for Unix Geeks contains a more comprehensive list):

File or Directory	Description
.DS_Store	This file contains Finder settings.
.Spotlight-V100	This file contains Spotlight settings.
.Trashes	This directory contains files that have been dragged to the Trash.
.fseventsd	Used by the File System events framework.
.hotfiles.btree	This is used by Mac OS X's Hot-File-Adaptive-Clustering feature to keep track of frequently used files.
.vol/	This directory maps HFS+ file IDs to files.
Applications/	This directory holds all your Mac OS X applications. Check out its `Utilities/` subdirectory for lots of fun stuff!
Desktop DB, Desktop DF	The Classic Mac OS desktop database.
Desktop Folder/	The Mac OS 9 desktop folder.
Developer/	Apple's Developer Tools and documentation. Only available if you have installed the Developer Tools.
Library/	Support files for locally installed applications, among other things.
Network/	Network-mounted Application, Library, and Users directories, as well as a Servers directory.
Shared Items/	Use by Mac OS 9 to share items between users.
System Folder/	The Mac OS 9 System Folder.
System/	Contains support files for the system and system applications, among other things.
Temporary Items/	Temporary files used by Mac OS 9.
TheVolumeSettingsFolder/	This directory keeps track of details such as open windows and desktop printers.
Trash/	Mac OS 9 trash folder.
Users/	Home directories.
VM Storage	Mac OS 9 virtual memory file.
Volumes/	Contains all mounted filesystems.
automount/	This directory handles static NFS mounts.
bin/	Contains essential system binaries.
cores/	If core dumps are enabled (with tcsh's limit and bash/sh's ulimit commands), they will be created in this directory as `core.pid`.
dev/	This directory contains files that represent various devices.
etc/	This directory contains system configuration files.
mach	This is a symbolic link to the /mach.sym file.
mach.sym	Kernel symbols.
mach_kernel	The Darwin kernel.
private/	Contains the tmp, var, etc, and cores directories.
sbin/	Executables for system administration and configuration.
tmp/	Temporary files.
usr/	This directory contains BSD Unix applications and support files.
var/	This directory contains frequently modified files such as log files.

5. Different Kinds of Hidden Files

As with other Unix flavors, you can make a file invisible by prefixing its name with a ., as in /.vol. This has the effect of making it invisible in the Finder, as well as when you issue an ls without the -a option.
Mac OS X also uses a file in the root directory (.hidden) to maintain a list of files that should be hidden from the Finder.
Also, HFS+ (the filesystem used by Mac OS) files and directories can have a hidden attribute set using the SetFile command, as in SetFile -a V SomeFile. (The SetFile command is available in /Developer/Tools after you install the Mac OS X Developer Tools package described in the sidebar.) This setting won't take effect until you relaunch the Finder. You can log out and log in again or use the Force Quit option from the Apple menu. You can turn off the invisible bit with SetFile -a v SomeFile. See the manpage for SetFile for more details. (Note that invisible files are only invisible from the Finder; you can still see them with ls.)

6. Aliases and Links

There are two ways to create links to files. The first is to select the file in the Finder, and drag it to a new location while holding down the Option and Command keys (or select Make Alias from the File menu). This creates a Mac OS alias that Cocoa, Carbon, and Classic applications can follow. However, Unix applications will ignore those links, seeing them as zero-byte files.
You can also create a link with ln or ln -s. If you use this kind of link, Unix, Cocoa, Carbon, and Classic applications will happily follow it.

7. X11

Mac OS X does ~~not~~ come with the X Window System. For native applications, it uses an advanced graphics system called Aqua. But if you want to run X11 applications, you're in luck: Apple has its own X11 implementation with nice Aqua integration, and there is an installer for it on your Mac OS X installation CD-ROM or DVD. If it wasn't installed by default, run the Optional Installs package on your install disc. You'll be able to run X11 applications side-by-side with Mac OS X applications, and they'll look great.

8. Fink

Are there some Unix or Linux applications that you're missing? Check out the Fink project, which modifies open source applications so they'll compile and run on Mac OS X. Fink already includes an impressive array of applications, and more are on the way.

9. /etc is Not Always in Charge

If you've come to Mac OS X from another Unix, you may expect that you can add users and groups to the /etc/passwd and /etc/group files. By default, Mac OS X only uses these file in single-user mode. If you want to add a user or group, it will need to go into the Directory Services database, a repository of local directory information. For more information, see this ADC article,Open Directory and the dscl Tool.

10. Shutdown Doesn't Really

For a long time, Mac OS X couldn't execute custom actions at shutdown. The SystemStarter framework (which predates launchd) can perform custom shutdown actions when the system is shutting down. For more information, see "Start Me Up: Writing and Understanding OS X StartupItems" (the ADC launchd article mentions that services that need an explicit shutdown procedure will need the old SystemStarter framework).

In September 2002, O'Reilly Media released Mac OS X for Unix Geeks.
Brian Jepson is an O'Reilly editor, programmer, and co-author of Mac OS X Panther for Unix Geeks and Learning Unix for Mac OS X Panther. He's also a volunteer system administrator and all-around geek for AS220, a non-profit arts center in Providence, Rhode Island. AS220 gives Rhode Island artists uncensored and unjuried forums for their work. These forums include galleries, performance space, and publications. Brian sees to it that technology, especially free software, supports that mission. You can follow Brian's blog here.

Default Passwords

2012-11-12T14:13:00.001-07:00

Default Passwords | CIRT.net:

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Easy Hard Drive Data Recovery Part 1 - YouTube

2012-10-14T03:32:00.001-07:00

How to Record a Call on Google Voice: Step-by-Step Instructions

2012-07-21T00:27:00.001-07:00

Steps

1
Receive the call on your Google Voice number. While talking, press 4 on your phone handset. You can press 4 at the time of taking the call, or at any time during the call.
Ads by Google
Online Voice Mail
Listen, Read, & Forward Voicemail. Instant Setup. 6-Month Free Trial.
www.eVoice.com
2
Listen to the automated "Call recording on" which will play for all parties on the phone. Continue talking as your call is recorded.
3
Press 4 again at any time you wish to end the recording. Hanging up will also have the same effect.
4
The recorded call is placed in the in-box like a voicemail

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Safecopy Recovers Data from Hard Drives and Other Media, Keeps Working When Other Tools Give Up

2012-07-17T06:42:00.003-07:00

Safecopy Recovers Data from Hard Drives and Other Media, Keeps Working When Other Tools Give Up: "custom live CD"

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How to Create Your Own Customized Ubuntu Live CD

2012-07-17T06:42:00.001-07:00

How to Create Your Own Customized Ubuntu Live CD:

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Create Free Online Surveys and Questionnaires

2012-07-10T19:38:00.001-07:00

Create Free Online Surveys and Questionnaires:

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Understanding Antennas For the Non-technical Ham by N4JA - An online Book!

2012-06-02T13:00:00.001-07:00

Understanding Antennas For the Non-technical Ham by N4JA - An online Book!: "meters or 20 meters. It just depends on the stage of the sunspot cycle. During the years with high sunspot numbers, nearby contacts are possible all day. At night, the skip lengthens making contacts possible to those parts of the world where it is still dark. Working DX on 40 meters is a nighttime or greyline event. When the sunspots are low, forty meters may have long skip during the day, and nearby contacts may be impossible or they may be very weak. During the time when we suffer from low sunspot numbers, many DX contacts are made during early morning, late afterno"

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The 10 Mistakes Everyone Makes When Working From Home - Forbes

2012-05-12T23:24:00.001-07:00

The 10 Mistakes Everyone Makes When Working From Home - Forbes: "The 10 Mistakes Everyone Makes When Working From Home"

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UNetbootin - Homepage and Downloads

2012-04-25T10:04:00.001-07:00

UNetbootin - Homepage and Downloads:

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Attenuation - Wikipedia, the free encyclopedia

2012-04-19T12:07:00.001-07:00

Attenuation - Wikipedia, the free encyclopedia: "Radio
Main article: Path loss
Attenuation is an important consideration in the modern world of wireless telecommunication. Attenuation limits the range of radio signals and is affected by the materials a signal must travel through (e.g., air, wood, concrete, rain). See the article on path loss for more information on signal loss in wireless communication."

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Impedance - Wikipedia, the free encyclopedia

2012-04-19T12:02:00.001-07:00

Impedance - Wikipedia, the free encyclopedia: "Impedance may refer to:
Electrical impedance, the ratio of the voltage phasor to the electric current phasor, a measure of the opposition to time-varying electric current in an electric circuit
Characteristic impedance of a transmission line
Nominal impedance, approximate designed impedance
Wave impedance, a constant related to electromagnetic wave propagation in a medium
Impedance of free space, a universal constant
Mechanical impedance, a measure of opposition to motion of a structure subjected to a force
Acoustic impedance, a constant related to the propagation of sound waves in an acoustic medium"

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Thermal Compound Roundup - February 2012 | Hardware Secrets

2012-04-16T10:38:00.001-07:00

Thermal Compound Roundup - February 2012 | Hardware Secrets:

The difference between room temperature and CPU temperature (lower equals better performance).

Virtual Oscilloscope: Simulation ... (oscilloscope simulation / oscilloscope tutorial)

2012-04-13T15:06:00.001-07:00

Virtual Oscilloscope: Simulation ... (oscilloscope simulation / oscilloscope tutorial):

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Running Mac OS X on AppleTV

2012-04-11T19:51:00.001-07:00

This article taken from Hackint0sh.org and refined with appropriate files and notes that will help avoiding lengthy install and errors.

Install Mac OS X on AppleTV without opening the box

Credits:
Modified Kernel by semthex
Partitioning portions taken from Turbo's "Creating a disk to boot from USB" notes [http://0xfeedbeef.com/appletv/]
Portions of this guide taken from semthex's "Mac OS X running on Apple TV" howto
Small portions written by Paul Taylor

Required materials:
An AppleTV
A boot.efi file from an AppleTV (get all bundle of required files here)
Intel Mac
Tiger Install CD
External USB 2.0 hard drive

Set up your USB drive
1. In Mac OS, open Disk Utility
2. In the left pane of Disk Utility, select the USB drive, choose "Partition" on the top bar
3. Hit the Options button at the bottom of the screen.
4. On the resultant screen, select GUID Partition Table. This is required to be able to install Mac OS X.
5. Lay out your partitions the way you want.. (One big, two, whatever) and format them with Mac OS Extended (Journaled)
6. Let the format finish. When done, you should be able to mount the drive.

Install Mac OS X
1. Pop in your install disk with the external drive attached
NOTE: I was unable to install Mac OS X on IDE drive from original MacBook OS X installation disks. You will probably need Mac OS X Tiger (Intel) purchased separately or install on SATA drive using USB adapter from original disks.
2. Reboot, holding down the Option key on your keyboard if you want to choose Boot Disk or hold "C" key to boot from DVD disk directly
3. Select the CD icon to boot from your install CD
4. Run through the complete installation process, selecting your USB drive as the destination.

Customize your USB installation
1. Run through the normal 1st boot stuff (Add user, etc.)
2. Download this: http://www.apple.com/support/downloa...dateintel.html
3. Install the 10.4.8 combo update
4. Reboot. Go to software update and get all the updates EXCEPT 10.4.9
5. System Prefs > Sharing
6. Check Remote Login here (this enables SSH)
7. Check Apple Remote Desktop
8. Click "Access Privileges", check the "VNC viewers" box, and put in a password here. This will let you remote control your AppleTV after you boot it with this installation.
9. Do any other customization you desire, except update to a newer version of Tiger

Get ethernet working with PCGenRTL8139Ethernet 1.2.0
1. Download http://www.sendspace.com/file/4i62j1
2. Install per the instructions in the file
(Note: This is needed to get either the built-in Ethernet to work or the Airport. This doesn't break Ethernet support for an Intel Core Duo iMac - not sure about others.)

Install proper kernel
1. Boot back up to your internal hard drive
2. Download the kernel from one of the mirrors listed here:
[Kernel] For AppleTV (to run OSX)
3. Mount your external drive
4. From a Terminal window, do this: ls -la /Volumes/YourExternalDisk
5. You will see a file called mach_kernel there.
6. Delete this file (may have to sudo rm /Volumes/YourExternalDisk/mach_kernel). Be careful here NOT to delete the kernel on your Internal Boot disk!
7. Copy the unzipped kernel you downloaded in step 2 to /Volumes/YourExternalDisk

Install boot.efi
1. Replace /System/Library/CoreServices/boot.efi with the boot.efi file from the AppleTV boot drive (it is in the same path)
2. To do the above, you may have to do a "Get Info" on the boot.efi file on your external drive and uncheck the "Locked" checkbox.
3. Bless the installation from a Terminal:
sudo bless --folder=/Volumes/YourExternalDisk/System/Library/CoreServices --file=/Volumes/YourExternalDisk/System/Library/CoreServices/boot.efi --setBoot

Cleanup
1. Delete the Nvidia kexts (all begining with NVD, there are 5) from /Volumes/YourExternalDisk/System/Library/Extensions
2. Delete /Volumes/YourExternalDisk/System/Library/Extensions.mkext and Extensions.kextcache if they exist

Patch AppleFileSystemDriver
NOTE: Perform these steps with a command line text editor (as Pico, VI) or with TextWrangler. DO NOT USE TEXTEDIT!
1. Edit /Volumes/YourExternalDisk/System/Library/Extensions/AppleFileSystemDriver.kext/Contents/Info.plist
2. Search for "IOPropertyMatch". It will be found similar to this:

Properties:

            <key>media-match</key>

            <dict>

                <key>IOPropertyMatch</key>

                <array>

                    <dict>

                        <key>Content Hint</key>

                        <string>48465300-0000-11AA-AA11-00306543ECAC</string>

                        <key>Leaf</key>

                        <true/>

                    </dict>

3. Just after the line with <array>, copy/paste this in:

Insert Code:

                    <dict>

                        <key>Content Hint</key>

                        <string>5265636F-7665-11AA-AA11-00306543ECAC</string>

                        <key>Leaf</key>

                        <true/>

                    </dict>

                    <dict>

                        <key>Content Hint</key>

                        <string>Apple_Recovery</string>

                        <key>Leaf</key>

                        <true/>

                    </dict>

Change Partition Type
NOTE: Once you do this, you can't mount the disk on your Intel Mac anymore without reversing the change. If you mess up here, you'll need to start over.
1. Open Disk Utility
2. Select the external disk from the left pane. Right click and select "Information"
3. Take note of the "Disk Indentifier". In my case, it is "disk3". For safety reasons, the rest of this guide is written with "diskX". Replace the X with the number of your drive.
4. From Terminal:
gpt -r show /dev/diskX
5. You'll get something similar to this back:

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6      

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640   77757488      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

You WILL need those numbers from the second partition (409640 77757488)

from YOUR (not the ones shown here) terminal to replace START and SIZE in instructions below

   78167128     262144      

   78429272   77610032      3  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  156039304     262151      

  156301455         32         Sec GPT table

  156301487          1         Sec GPT header

6. A little explanation here is in order. The first real partition is on the line beginning with 40. In this case, it runs from 40 through 409600. (I'm guessing these are bytes) Next to the size is the index, 1. The very next line is the one we are interested in. This is the partition that contains your bootable install. It is index 2. You may or may not have and index 3)

7. Unmount the disk:
disktool -u diskX

8. Now, we remove the entry in the table for the 2nd partition
gpt remove -i 2 /dev/diskX

I got this back:
gpt remove: /dev/disk3: 1 partition(s) removed

9. Mac OS will remount any remaining partitions. Unmount them:
disktool -u diskX

10. Now, we add a new entry to the table. For index 2, take note of the start, and the size, as you'll need them here. Replace the START and SIZE strings with your values.

gpt add -b START -s SIZE -i 2 -t "5265636F-7665-11AA-AA11-00306543ECAC" /dev/diskX

Note that it doesn't tell you anything back.. You just get a prompt.

11. Performing step 5's command again gets me this:

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6      

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640   77757488      2  GPT part - 5265636F-7665-11AA-AA11-00306543ECAC

   78167128     262144      

   78429272   77610032      3  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  156039304     262151      

  156301455         32         Sec GPT table

  156301487          1         Sec GPT header

Note that the index 2 partition type is now the required type for AppleTV to boot to.

Boot your AppleTV with OS X
1. Attach your external drive to the USB port
2. If already booted up, hit MENU and "-" on your remote and hold it until reboot starts
3. If your AppleTV isn't on, plug it in to power. No remote finagling required.
4. Watch in AWE as your AppleTV boots up OS X.

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Macbook Pro Unibody - No Backlight - Logic Board Question - Page 7 - MacRumors Forums

2012-03-18T18:27:00.001-07:00

Macbook Pro Unibody - No Backlight - Logic Board Question - Page 7 - MacRumors Forums:

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A1268 Power Jumper on Logic Board

2012-03-17T12:46:00.001-07:00

Podnutz Forums • View topic - 1st Apple MacBook Pro - no power A1286: "I only have the motherboard and the keyboard (which includes the power button) left"

Macbook Pro Unibody - No Backlight - Logic Board Question

2012-02-25T10:19:00.001-07:00

Solution Explained

Robtex Swiss Army Knife Internet Tool

2011-12-21T11:19:00.000-07:00

Robtex:

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Bonefarm

100 Watt sub woofer amplifier. - Electronic Circuits and Diagram-Electronics Projects and Design

Electronic Projects for Musicians Craig Anderton 1980

Software Defined Radio

Software Defined Radio

EchoLink®

CompTIA Linux+ Certification Info

Top Ten Mac OS X Tips for Unix Geeks

1. Where's My Shell?

2. Sudo, Not Su

3. Startup

4. Filesystem Layout

5. Different Kinds of Hidden Files

6. Aliases and Links

7. X11

8. Fink

9. /etc is Not Always in Charge

10. Shutdown Doesn't Really

Default Passwords

Easy Hard Drive Data Recovery Part 1 - YouTube

How to Record a Call on Google Voice: Step-by-Step Instructions

Steps

Online Voice Mail

Safecopy Recovers Data from Hard Drives and Other Media, Keeps Working When Other Tools Give Up

How to Create Your Own Customized Ubuntu Live CD

Create Free Online Surveys and Questionnaires

Understanding Antennas For the Non-technical Ham by N4JA - An online Book!

The 10 Mistakes Everyone Makes When Working From Home - Forbes

UNetbootin - Homepage and Downloads

Attenuation - Wikipedia, the free encyclopedia

Impedance - Wikipedia, the free encyclopedia

Thermal Compound Roundup - February 2012 | Hardware Secrets

Virtual Oscilloscope: Simulation ... (oscilloscope simulation / oscilloscope tutorial)

Running Mac OS X on AppleTV

Install Mac OS X on AppleTV without opening the box

Macbook Pro Unibody - No Backlight - Logic Board Question - Page 7 - MacRumors Forums

A1268 Power Jumper on Logic Board

Macbook Pro Unibody - No Backlight - Logic Board Question

Robtex Swiss Army Knife Internet Tool