[sdiy] SMD experiences

[dan snazelle]

On Sep 8, 2011, at 10:09 PM, David G Dixon wrote:

>> What would you suggest for said application of caps?
>> Also, what sizes do y'all suggest?
> 
> We've gotten into the habit of applying 10p to 22p caps across the feedback
> resistor in just about every opamp gain cell, to avoid HF oscillation.  It's
> not always necessary, but at least make room for the option on the board.
> In my funky Excel through-hole layouts, this is very easy to do: just create
> a couple of optional pads 0.1" out from each output and inverting input of
> every opamp.  I can even kludge them in easily if I forget (which I never
> do).  This is harder in SMD multilayer boards, where you really need to have
> it all there at the outset, or the board is basically a do-over.  However,
> you can kludge 0603 caps over the adjacent output and inverting input pins
> of SMD opamps pretty easily (if you're Rick Moranis, and you have very
> strong glasses).
> 
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can anyone recommend a good model of magnifying glass (the kind on the arm? and a place to buy flux pens?

how do you use the flux with SMT? every time I have hand soldered SMT I have done it WITHOUT flux and it has always been a nightmare

thanks