A small ribbon speaker for mice

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yj33

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Joined 2016
#1
Hello all,

I would like to try to make a small ribbon speaker for mice.

Mice can hear up to 90kHz...
To reach a such frequency we have electrostatic , plasma, ribbon speakers.

Do you think that ribbon is the best choice, (I mean easy to make)?

I have some neodyium magnet, 15x15x8 with N/S poles on the 8mm axis.
What can I expect from a 3x15mm ribbon and two of these magnets?
I need just a few milli watt, mice will be at a 30cm distance and they will agree if it is not hifi sounds...
The ferrite core that we can find in PC power supply could be a start for the down transformer?
Most audio amplifiers are not made to rise up to 90kHz, some thing like a STMICROELECTRONICS TDA7391LV could do the job ?

And a last and nauti question (in a dyi forum) : on ebay one can find low cost ribbon speakers but the band pass above 20-30kHz is never given. Do you think that most of them are not to much attenuated up to 90kHz?

Your advices and suggestions will be very helpfull.

Sincerely , Yannick.
 
#2
I think it might even be hard to hit 90khz, I believe 6 micron Mylar in a Esl starts to drop at 18khz already , not much but it starts so not sure what spl remains at 90 kHz... are piezo,s not an option ? I think they reach pretty high be it ugly 🙂

Search for ultrasonic transducer I think there are capsules for arduino
 
#3
Thank's WrineX,

Yes, it would be easier.
The best I found is : https://www.amazon.co.uk/60kHz-Frequency-Ultrasonic-Speaker-Piezo-Black/dp/B00PJ8YIJC
which frequency diagram stops at 39kHz., I wonder if these "60kHz" is not a mistake...

It is so cheap that I should start trying it.

An HF amplifier remains a problem...

Do you know if sound cards said to play 192kHz sample are realy able to produce a 96kHz signal at their output?
 
#4
in theory they are , it wont be a nice waveform though 🙂 more a sawtooth(exactly a sawtooth). but i dont know what else of stuff is in there to filter noise etc. it would make a measure pont every half wave.. so when missfired you would end up with no swing at all.. im not sure how soundcards produce this so no clue. but i think you beter use soemthing else then a soundcard to produce that.
a signal generator would be more usefull or look at components that create the PWM signals for class D amplifiers.


here

https://www.amazon.co.uk/KKmoon-Pre...r=1-1-spell&keywords=singal+generator+100+khz
 
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#5
@Wrinex. When you draw it you see a saw tooth, but if the D/A keeps it's output value each half period then it should be a square signal. Yesteday I discovered that the sound module of my P.C.'s mother board is not limited to 44.1kHz but 192kHz. I looked with a scope what was the signal at the output, when it played from a wav file , a sinusoïde which frequency was varying from 20k to 90kHz. At 90 it still was a nice sinusoide attenuated by 10-15%. that's not too much... In fact these cards compute a kind of fft, and they interpolate to over sample by x8 to produce a signal as close as possible to the original sampled one. Of coarse if you sample at the zero crosing a sinusoide you'l have nothing, but it is not the case with "natural" signals. Try, they are not just a D/A converter... Try to play a serie of 1/-1 at 44100 you should see a nice 22.05kHz sinus. Try at 44.1 because most cheap cards , even able to play 192khz digital signals , have an analogic frequency response limited to 20kHz...
Thank's for the link to the kkmoon XR2206.
y.j.
 
#6
ah wel nice info 🙂 i was indeed going out from a simple dac 🙂 then it would be all time related what you get with a freq so high. still i hope it will be usefull i think the generator would be the simplest of all, unless you want to incorporate some programming or something
 
#7
@WrineX. Yes , unfortunatly it is the case, I need to play recorded natural mice "songs" and a generator which can produce better signals than a sound card can not replace it when we have to manipulate complexe sounds.
Thank's for your attention.
 
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