nuckolls.bob(at)aeroelect
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 Posted: Tue Mar 01, 2011 9:38 am Post subject: Bread-board meets the brass board |
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Back when grandpa was a interested in working with
that 'radio' stuff, it was not uncommon for the DIY
electronics project to be built on a sheet of wood
with devices simple screwed down to the surface. If
one needed the occasional tie-point, a brass nail
driven into the wood could be a place where multiple
conductors could be soldered together at a mechanically
stable location. This was often referred to as 'bread
boarding'.
Modern practitioners of the ancient arts are still
making good use of grandpa's techniques . . .
[img]cid:.0[/img]
In more recent years, the parts got smaller and the
circuits much more compact. As operating frequencies
rose, the need for a low-impedance ground emerged
and the prototyping moved off the 'breadboards'
onto what was euphemistically called a 'brass-board'.
The planar substrate became a sheet of copper clad
ECB material or other solderable material.
Several times a year, I find it necessary to refine
some combination of components for part of a design
or to fabricate a temporary test tool. The two
photos below . . .
http://aeroelectric.com/Pictures/Tools/Development_Tools/BB_BB_top.jpg
http://aeroelectric.com/Pictures/Tools/Development_Tools/BB_BB_Bottom.jpg
illustrate a technique I've found useful to these tasks.
A small sheet of brass (or copper) is tacked to a piece
of wood . . . in this case a scrap of hard veneered
plywood. Hard terminals are machine screws counter-bored
in from the bottom. I've tried various glues for bonding
the brass to the wood . . . soldering temperatures tend
to break he bond. So shortest nails in the brad gun
serve to attach the brass to the wood. If too long, they
can be folded down on the back.
This is a fast, low cost, experimental substrate that
borrows from three generations of tinkerers.
Bob . . .
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