Overland Models SD75M

Lots of sound from this fine model!

Bruce mounted three speakers below the fan and exhaust openings in the top of this loco, after removing the light board. Bits of styrene were used to assure a seal between the speakers and the shell. Three 4 ohm speakers were wired in series to provide a 12 ohm load for the Tsunami decoder.

In the SD45-2 model done for the same customer at the same time, four speakers were used. The details of this model had it such that only three of the speakers would be firing out through openings, so only three were used.


The 1.5 volt lights were supplied through 240 ohm resistors and a pair of 1N4001 diodes for both front and rear. For more information on this - CLICK HERE.

August 15, 2008

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