Automation and Animation
Ear-phones as tiny hidden speakers,
Tape loops running under the layout,
Hallmark cards chips you load with sound.
I'm collecting small tape decks too, for a start.
Radio Shack sells an audio memory chip.
I also bought a kit with railway sounds on
a chip-on-board, made in Hong-Kong.
BOB
There was a thread on this topic on the Nn3 list. They just had their annual convention in Denver last week.
What they found was that in a home environment, a fractional part of a watt of audio power into a tiny speaker was almost too loud. But at shows with their modular layout, it took quite a few watts of audio power and a large speaker just for a sound effect to even be heard over the crowd noise.
Don't know if you build modules or not, but I found that point interesting. I guess a small amplifier and a volume control would solve the issue if you go to shows.
Bill
Could take an old speaker and remove the paper cone and connect the center to the item that needs to be moved. Some sort of sound or pulse wave to make it move up and down.
Two speakers to make it move up/down and sideways.
Donald
Small speakers used to drive short linear movements? ... sounds like a
good idea. I would think many modellers could determine things like
throw distance, but speakers are designed to vibrate. How would they
stand up to single 'to-' or 'fro-' motions. This would mean maintaining
a dc voltage to hold it in position for a while - like a solenoid,
really.
I can experiment to find how far a speaker would move with a given dc
voltage; I could limit the voltage to keep within the power rating of
the speaker, but surely a 1W speaker (say) is only designed to sink 1W
with it moving all the time, not static.
(I think my musings arise from knowing that ratings such as '8-ohm' for
the impedance actually varies enormously with frequency and it certainly
is NOT the same as dc resistance.)
Dave