ElectronicNoobBlog
My "fight" with electronics devices :-)
Author Archives: ENB
Installing Mac OSX from USB on Power MAC G5
My DVD drive was broken on old Power MAC G5.
Im not interested in finding replacement because it’s anyway obsolete but i need to install Mac OSX.
Lucky G5 have Open Firmware that allow booting up straight from USB flash drive and take install painlessly!
First You need to create RAW image of Your Mac OSX DVD into file.
Than using for example DD on linux put it straight to USB flash-drive.
There many tutorials about that topic.
I have Microsoft keyboard while starting up Your mac press and hold four keys at once:
Windows key + alt + o + f
until You get a gray screen with letters “Welcome to Open Firmware” and command prompt.
type
boot ud:3,\\:tbxi
and press enter
after while You will get standard installer just like on DVD.
ud:3 is device id, to not confuse Yourself remove all USB storage devices except that one You want boot from.
Here is mine video in real live:
Clansman PRC-350 (RT350) battery adapter mod for use rechargeable AA
Before and after applying mod
Leaked capacitor strike again! – devastation of power supply by electrolyte
Another failed power supply caused by leaked AC capacitor… this time PSU covered with electrolyte…
Fixing (blown) leaked AC filtration capacitor on AKSEL communication 13.8V 8A power supply
Fixing (blown) leaked AC filtration capacitor on AKSEL communication 13.8V 8A power supply.
After long fight i managed to get exactly same capacitor!
SSTV images for testing radios / software and compare quality
SSTV is a form of encoding allowing You to transmit pictures over virtually any transmission medium that allow uncompressed human speech – starting from phone ending on SSB radios. It’s similar to “fax” that was used over landline.
For testing i decided to record couple of SSTV sample audio files using different encoding to compare quality.
The slower (longer time) works better on noisy frequency like SSB.
Quicker one working perfect over AM/ FM.
Here are files for testing, You can decode them from “speaker” using Android smartphone and application called “Robot32” <- don’t let name mislead You, it decode all modes used here!
Teardown of failed PoE adapter UBIQUITI UBI-POE-24-5
Here is example of unfixable PoE adapter.
It looks like capacitor leaked.
