I'd like to do demonstrations of the cone moving back and forth slowly, meaning like 1 Hz or actually more like 0.1 Hz.
This is not a trivial undertaking, especially since I want to spend as little as possible.
AND, because I am not going to start hand building anything-I don't have time and it is not a forte of mine.
I know there are sine generators that can go that low, maybe available used. There are also online signal generators, but I haven't checked if they will go that low because I'm imagining no laptop will actually output such a low frequency.
And THEN, you need essentially a DC coupled amp, or blocking capacitors inside won't output those frequencies either. DRA Labs (maker of MLSSA) used to recommend a Rolls amplifier but I don't see that on their site any more, and it was not inexpensive.
A kinda sorta alternative would be a variable DC supply, just turn the DC up and down and I guess the cone would move out and back, but not inward and back. A supply that could continuously adjust to negative as well would move the cone. But with this kind of setup you don't see the periodic motion.
Ideas?
This is not a trivial undertaking, especially since I want to spend as little as possible.
AND, because I am not going to start hand building anything-I don't have time and it is not a forte of mine.
I know there are sine generators that can go that low, maybe available used. There are also online signal generators, but I haven't checked if they will go that low because I'm imagining no laptop will actually output such a low frequency.
And THEN, you need essentially a DC coupled amp, or blocking capacitors inside won't output those frequencies either. DRA Labs (maker of MLSSA) used to recommend a Rolls amplifier but I don't see that on their site any more, and it was not inexpensive.
A kinda sorta alternative would be a variable DC supply, just turn the DC up and down and I guess the cone would move out and back, but not inward and back. A supply that could continuously adjust to negative as well would move the cone. But with this kind of setup you don't see the periodic motion.
Ideas?