Monday, October 13, 2008
Monday, 13 Oct - PCB
today was PCB lesson. but didnt know why and how, i suddenly had no mood for the lesson. perhaps it was the stiffness on my shoulder that is bothering me, and today was the first that my doctor advice me to stop the medication and see my condition. without the painkiller, i have to bear the pain to travel to school. today PCB was rather hard and complicated, soldering plus wire wrapping... i prefer wire wrapping though, it was fun to twist and coil the wire. and for the first time since week 1 of the lesson, i made a terrible mistake, i misread the capacitior value. and i gotta desolder it and everything including the switch, 11 capacitor and 7 switches, all of them and all the switch broke.i asked for new switches from my faci and he laughed at me... urgh... saying me break the record of destroying 7 switches... even though wasted lots of time redoing the circuit, it manage to work in the end, a sign of relief...
this is the circuit we suppose to do, seems complicated, 12 capacitors, 11 switches total, 2 resistors, a 555 chip and a buzzer. i soldered the capacitors and switches, and wire wrap every single connections. didnt have my circuit with, lent to my friends as his reference for his PCB lesson tomorrow, if not i could my circuit in here.
i tried on the different sound created due to the different frequency of the capacitor and suddenly it has a explode sound. to my disbelief, my friend increase it voltage to 28.9V instead of the 9V recommended with a threshold of 16V. GRRR, it blew my 555 chip with spark coming out and he compensate me with his chip...
hope to get another A grade from my faci... so far this module is the easier to score...
byebye,
tired now...
