[sdiy] components, smd and pcb

[Sowa Roman]

Hi, please find my a dumb question inline...
and other comments too

""-----Original Message-----
""From: Tony Clark [mailto:clark at andrews.edu]
""Sent: Monday, March 25, 2002 7:15 PM
""To: Synth-DIY

""Subject: Re: [sdiy] components, smd and pcb
""   The only disadvantage to using SMT resistors is that they 
""do need to 
""be sized accordingly to the current they must carry.  0805s 
""(1/10W) are 
""probably  the smallest anyone should attempt, and I'd 
""recommend staying 
""with 1206 (1/8W) or 1210's (1/4W) for anyone who doesn't have a good 
""steady hand and a very good soldering technique.

Does that mean, not carefull soldering causes resistor's parameters
to derate? Does its resistance change, or does it influence reliability?
Actually, yesterday I experienced for the first time how 0603 resistor
can be broken, but I thought it was just bad quality component.
How soldering with iron (not hot-air & paste) influences SMD part?


""   Any SMT resistor 0805 or larger has the value printed on 
""it.  I find 
""it fairly easy to deal with.  Non-polarized capacitors, as 
""well as most 
""(if not all) SMT transistors, do not have any sort of 
""markings on them 
""and must be carefully kept separated from other like components!

I saw many times markings on capacitors - a letter and one digit.
Letter was for prefix, and digit was number of zeros. Now either my eyes
are too bad, or they simply stopped marking them...

""   Personally I enjoy what SMT allows me to do and would love 
""to see more 
""people working with it.

I have the same feeling. What I like the most is that it looks so cute ;)

Roman


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