Tuesday, April 10, 2007

Hello! Mugging week it shall be for this week. So many tests! Tomorrow, i will be having Chemistry test and friday and maths pre test and on next monday, its the real maths test. This is so horrible! Anyway, i returned Jade's laptop already and she sent an army to come and collect it with her. Woah, almost the whole family appeared with the exception of her father and her second sister. Well got her laptop back up but her keyboard is sort of screwd up now and i swear that its not caused by me.

Currently, my brain is being filled with chemistry formulaes which are hard to digest. Hope that they can diffuse into my brain tonight when i sleep on them (: Well today, i tested out my car batter powered CD player concept. I discovered something about that battery. It is acting abnormally which i do not know if it is right or not. The voltage is unstable and it does not have power. At first, the voltage of the battery was only 10+ volts. Under load it falls to below 9volts. Then i connected a super tough load, a 7.5ohm resistor across the terminals, and after awhile, the voltage returned to around 12V. It really is strange as i thought battery should always just give me a certain voltage and the power it can output should be a constant. Perhaps the battery is really spoilt. So in the end, i had the 7.5Ohm resistor connected in parallel with the CD player so that the battery is able to provide the right voltage for the CD player to work. I did some listening test. Background noise has significantly went down quite alot but there was still some hiss and buzzing when the music is of very soft levels. I was not very happy with the results as i had expected something better. So in the end, i scrapped the idea and thought "Dang this stupid idea, go get a proper DAC and a Transport or just a good CD player"

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