Playing with sound, part 2
Well, there it is. I made up a circuit that plays one of nine tracks at random, with selectable intervals. Two sounds can be triggered by the IR detectors which will go out of sight beyond the end of the layout. A whistle as a train enters the station and a different one as a train approaches the traverser.
The whole lot is sat neatly in an old pa amplifier case with its own mains power supplier. This seems to make it immune from transients on the railway itself triggering sounds. The speaker is an old hi fi bookshelf type tucked away under the layout, gives a distant feel to the ambience.
A couple of pics. I could post circuit diagrams if anyone wants them, but as with the IR board you probably wouldn’t do it this way unless you happened to have the bits lying about. Sadly I am the sort of person that does. Mair chips than a chip shop.
One sound every 3 minutes or so seems ok for a start. There are various sounds of railway activity, whistles, shunting, a genuine Caley westinghouse pump and some of a townscape, horses and carts clattering by, some church bells. They do sound as I would imagine them to across a distance. Sourcing the sounds and processing them was actually the most time consuming part of the whole project. If I come across a bit of sound I like I will borrow it, the good thing about the sound module is that the mp3s are on a micro sd so changing them is simple.
The big question is do I like it? The honest answer is that I haven’t made my mind up yet. Ask me this time next year how much of the time I have had it switched on while running trains. As I said in the last post this was something I wanted to try cheaply and the whole thing has only cost about a tenner so if I don’t like it its no big deal.
Photos of nice blue trains will resume now I have got that itch scratched...........
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