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Many steam locomotives with sounds use a magnet on one of the axles to trigger the chuffing sound.  Near that axle is installed a reed switch.  As the axle turns the magnet gets near the reed switch and draws the reed toward the magnet.  This closes the switch and completes a circuit to the sound board telling it to make the chuff sound.  Some of the early locomotives only made 2 chuffs per turn of the wheels.  By adding a 2nd magnet you can get the correct 4 chuffs.

Chuff magnets and a reed switch. (5) magnets pictured, (2) are smaller.  You could get them from Ed Bender when he was in the business.  Digital Dynamics.   (4) chuff per revolution required (4) magnets, which worked pretty good on larger diameter drivers. You had to dremel-out a hole, ((4) holes), in the back side of the driver to install the magnets, with CA.  The reed switch was installed along the loco frame, close to the driver.  They are very strong magnets.

 

 

Last edited by Mike CT
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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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