Thanks everyone! The piezo itself is pretty quiet even when it was installed by the factory. I think the issue is it's not directly coupled to the casing - if you look at the old digital watches the piezo is basically glued onto the backplate.
I reckon if we can find a smaller piezo sounder that can actually be stuck to the back casing there might be a real improvement in volume
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Thanks everyone! The piezo itself is pretty quiet even when it was installed by the factory. I think the issue is it's not directly coupled to the casing - if you look at the old digital watches the piezo is basically glued onto the backplate.
I reckon if we can find a smaller piezo sounder that can actually be stuck to the back casing there might be a real improvement in volume