These
two mounting methods were devised to protect PC boards from vibration
when installed in the engine compartment of a car. They could also be
used in other applications where vibration is a problem. Method 1
involves rigidly mounting the PC board inside a diecast box and then
mounting the box itself to provide vibration isolation. As shown, small
grommets are installed in suitably sized holes in the sides of the box.
The box is then secured to angle mounting brackets using M4 screws,
washers and nylock nuts. Method 2 involves mounting the diecast case
onto the chassis of the car and then mounting the PC board as shown,
using M3 screws, grommets, hollow spacers and nylock nuts. In this case,
the grommets are fitted into suitably sized holes in the PC board
itself. Once the nuts are tightened, the PC board should be able to move
slightly, relative to the box. If there is not enough space on the
board to fit the grommets, then Method 1 is the way to do it.
Author: David Boyes - Copyright: Silicon Chip Electronics
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