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Reply to "Remote Control Audio for Rolling Stock"

I have the 315mhz units as well.  Given the nature of the receiver, I can't see changing the frequency as being the primary solution.  If the filter doesn't do it on the MP3 module, maybe the alternate amp might be better.

 

Truthfully, I'm not as concerned about keeping the cost rock bottom, I'm more interested in functionality.  I don't want the cost to spiral out of control, but anytime you have to layout and build circuit boards, it's not going to be a $5 solution unless you're the Chinese and you're building 100,000 of them.

 

For either of these versions, I want to be able to play any one of the four sound files and also stop it on command remotely.

 

 

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