[sdiy] going SMT, need help...

[Tim Parkhurst]

On 10/25/07, mark verbos <mverbos at earthlink.net> wrote:
> HI everybody,
>
> I am in the process of building my first SMT project. It turns out
> the soldering ain't so bad! It's nice that you don't have to keep
> flipping the board over to clip the legs off of everything. However,
> this is a module based on a design I already had working with through
> hole parts but I can't get it to work with SMT! I replaced what I
> thought were generic transistors with MMBT3904 and MMBT 3906. I'm
> thinking that this may be the problem, since I have retraced the PCB
> about 100 times. the original used 2N3565 and 2N4248. Is there
> somewhere online I can search for closer matching SOT-23 package
> transistors? What do you SMT gurus do?
>
> Thanks,
>
> Mark

Hey Mark,

If you have the correct through-hole transistors, you might try
tacking them in place on the SMT pads and just seeing if the circuit
behaves. Of course, watch the pinout, as the SMT devices can be very
different from the standard version.


Tim (if the parts were blue, would they be Smurface Mount?) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein