A few days ago, my ancient mac mini (PowerPC G4) hung during OS upgrade. Can't boot up anymore. Using the original OS X installation disc can't recover the system. The recovery also hang in the middle of installation.
Last resort: crack open the machine and tried to replace the RAM. Actually it is sort of upgrade (from 512M to 1G). Mystically, the re-installation finally worked!
The moral here is... "if anything can go wrong, it will"... -_-... who would suspect the cause was a faulty RAM module... after the machine has been running for many years...
Saturday, August 23, 2008
Monday, August 18, 2008
Saturday, August 9, 2008
Sunday, August 3, 2008
Sun jar 2
A follow-up with the Sun Jar. After I got the jar, i noticed that there are 2 potential improvements: (1) I like it to be brighter; and (2) it doesn't last long enough (only around 5 hours even when fully charged. I prefer it to last the whole night).
Finally have time to disassemble it today and found that the rechargeable battery is only of 700mAh... -.-... no wonder... Replaced it with a 2700mAh battery... will see how it go. But of course, the question is whether the charging circuit efficient enough to fully charge the 2700mAh during the daytime.
(The circuit on the right is my experimental trial on a different approach to test if it can get a better result... both the light intensity and number of hours it can last)
Finally have time to disassemble it today and found that the rechargeable battery is only of 700mAh... -.-... no wonder... Replaced it with a 2700mAh battery... will see how it go. But of course, the question is whether the charging circuit efficient enough to fully charge the 2700mAh during the daytime.
(The circuit on the right is my experimental trial on a different approach to test if it can get a better result... both the light intensity and number of hours it can last)
Friday, August 1, 2008
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