4: Line array of four identical speakers - wired in a series-
parallel combination, the resulting unit is rated at 8 ohms
and 8 watts.
ance (4 ohms on a decoder rated for a nominal 8 ohms), then
heat may become an even bigger issue.
Figure 2 shows a mounting plate for a TSU-750 micro Tsunami I
built out of brass sheets held together with thermally conduc-
tive epoxy (see my December 2012 column -
. Brass sheets (0.032” thick) were cut
to the size of the top of the frame where the driveline went
between the motor and the front gear tower. They are stacked
up until they are tall enough to clear the gear tower at the
limits of its height when pivoting and swinging. Then a single
sheet is glued extending forward to provide a decoder mount-
ing location. In the photo, a bit of white epoxy is visible where
the decoder mounts. I had previously mounted a decoder on
this stack, and removed it by light prying. The Alumina Thermal
adhesive broke cleanly away from the decoder shrink tubing.
A dab of thermally conductive epoxy and the decoder will be
back in place – flat side against the brass plate.
So how does this work? The components inside the decoder
that need to be cooled are connected through thermally con-
ductive foam to a metal plate that is held in place with the
4
