Re: gEDA-user: TO-92 Best Practices

[Martin Maney <maney@xxxxxxxxx>]

On Tue, Mar 02, 2010 at 11:38:00AM +0100, Gabriel Paubert wrote:

> On Tue, Mar 02, 2010 at 02:01:51AM -0500, DJ Delorie wrote:
> > For matching, can you just press them onto a pcb carrier?  Something
> > that plugs into a breadboard, and gives you three big copper pads to
> > contact?  Assuming holding them down with your finger or even just
> > letting gravity do the work, it might be sufficient.

> From my experience, gravity is insufficient. The contact quality 
> is too poor if you don't have anything to press the device against
> the pads.
> 
> I was testing at ~1GHz, but it should not affect that much,
> except that you need some plastic stick insted of a finger
> (too much disturbance, probably stray capacitance). 

And at the DC extreme, the heat of the finger will make any attempt to
match offset a joke (other parameters maybe not so much).  So, no,
usually fingers need to stay away from the DUT.

-- 
There's one way to find out if a man is honest: ask him;
if he says yes, you know he's crooked.  -- Twain



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