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sound decoders for DC - Model Railroader Magazine

Author

Mia Walsh

Updated on April 07, 2026

I see things have changed. A few years ago Digitrax sold a Sound Bug to put in a DC loco for sound.

Also they sold a box to put between a DC power pack and the layout with buttons to push for sounds. BLI did also. Things have changed.

Decoders can be put under the layout with a sound system using a 8 ohm to 1000 ohm audio transformer.

Edit.

Below is a recommended way from SoundTraxx on how to kook up.

A CV or two can be modified to keep from heating up the resistor.

I did that about eight years ago with an installation in a two decoder install. Non sound in the loco. Micro Tsunami in the tender, later. I just did the resistor thing.

Rich