MTH Doodlebug horn | O Gauge Railroading On Line Forum

Bill MakelOGR Forum Member DIGITAL SUBSCRIBER

Reconditioned an MTH Doodlebug protosound trolley including a new BCR battery a few years ago and had it working like new but last week when I took it to a local display there is a loud buzzing noise from the horn all of the time. Will a new horn fix this or is there a problem in the control board. Thanks! Bill Makel

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7/4/229:13 AM

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gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

I suspect the buzzing is a cap going bad on the power supply. It's probably louder on certain types of transformers.

7/4/229:29 AM

Bill MakelOGR Forum Member DIGITAL SUBSCRIBER

Noise is definately from the engine

7/4/229:43 AM

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Yes, the cap is in the engine, however the type of transformer can affect the electrical noise level.

7/4/229:56 AM

Bill MakelOGR Forum Member DIGITAL SUBSCRIBER

What is the fix.

7/4/223:00 PM

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

If it's the bottom power board, I normally just swap them out.

7/4/223:18 PM

Bill MakelOGR Forum Member DIGITAL SUBSCRIBER

$50 buys the bug

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