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Jerry, I'm sure one of the electrical gurus may know, but I'm wondering if there is some way to find out which circuit heats up on the PC in the tender when the whistle button is pushed on the control. Then figure if it could trigger a simple push/pull solinoid to operate the whistle? The solinoid could be powered by the onboard battery. Just a thought.
 

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Jerry, I was snooping around inside the tender finding corrosion on the PC boards and thinking about your whistle. The circuit I would use to activate a solinoid is already in place. The lighting circuit. I would give up the headlight, which I never use, in a hot second for an R/C whistle!
 
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