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I work with autistic children. I need to produce a tactile input using pure analogue sound of 96 Hertz through a transducer.

The fifties signal generator I got on e-bay does not put out enough signal strength to run the transducers. I need the signal to be pure analogue continuous and and the volume to be adjustable.

How do I generate a signal of 96Hz with a low source impedance?

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    \$\begingroup\$ It sounds like you just need a proper amplifier. \$\endgroup\$
    – Hilmar
    Jul 23, 2017 at 20:21
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    \$\begingroup\$ need more info about the transducer. is it a loudspeaker? impedance? \$\endgroup\$
    – bobflux
    Jul 24, 2017 at 11:45
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    \$\begingroup\$ Why are you confined to analog techniques for tone generation? For that matter, is there any evidence you need linear amplifier and cannot use a class-D one? If such conclusions were reached, were they based on experiments with good implementations, or crude ones with obvious flaws? \$\endgroup\$ Jul 24, 2017 at 17:24
  • \$\begingroup\$ Do you have more information upon the application / links etc? This is of interest to me. + I second that it just sounds to me you need an amp. For that frequency you could use a digital frequency gen chip or even an arduino with a specifically designed output frequency, or saying that even use our old friend the 555 to achieve 96Hz without a sig gen, then use any audio amp. \$\endgroup\$ Jul 24, 2017 at 17:31
  • \$\begingroup\$ @Rendeverance the 555 or (unless done very carefully) Arduino are going to produce square waves. These will sound notably different from a single frequency sinusoid. But there are lots of ways of producing pure sinusoids. \$\endgroup\$ Jul 24, 2017 at 18:12

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If your transducer has a similar impedance to an ordinary loudspeaker, then the answer would be to feed the output of your signal generator into any off-the-shelf audio power amplifier. These are designed with a low-impedance output, for driving loudspeakers.

If the impedance of the transducer is particularly low (below about 8 ohms), then you may have to think a bit more about what to drive it with.

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  • \$\begingroup\$ The transducer is :(nxt) Extreme 5w. Part of the reason I need pure analogue is I've had complaint from the kids that they can sense directly the square rectangles that are used to form the digital packets - if you will- I can verify they are very sensitive beings...them...I'm still trying to figure out how to produce three and four dimensional coherent analogue waves. The old signal generators I’ve tried don't put out a strong signal to run the transducer I’m current playing with. \$\endgroup\$ Jul 25, 2017 at 0:36
  • \$\begingroup\$ The complaint I get most is digital feels like saw blades. I don't get the same complaints for analogue signals. Another complaint is lack of dimensionality in the waves propagated. A simple analogue sign wave sounds tinny to \$\endgroup\$ Jul 25, 2017 at 0:37
  • \$\begingroup\$ them...I'm still trying to figure out how to produce three and four dimensional coherent analogue waves. The old signal generators I’ve tried don't put out a strong signal to run the transducer I’m current playing with. \$\endgroup\$ Jul 25, 2017 at 0:39
  • \$\begingroup\$ I get no complaints from 96 hrtz conventional weighted tuning forks...but I can't sustain a long enough tactile signal so they can be trained to locate and relax the muscles in their bodies....ie progressive relaxation. \$\endgroup\$ Jul 25, 2017 at 0:55

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