Choosing the Right Voltage Gain for Frequency Amplification | 250 Hz to 50 kHz

[Sveral]

Hmmm let's compare cochleae...human on other hand isNot that different maybe , 3x in width ?

Before investing a lot of money, see whether you can hear that 50khz .

It will be interesting also to see whether you can hear short bursts of 50khz
when i was in high school a fellow built a 40khz sonar for science fair using a hi-fi tweeter and a parabolic dish to both send and receive. (All vacuum tubes of course in 1963...)
When he broadcast continuous tone for tuning it up one could not hear it
but when he switched into pulsed for ranging, wow was it annoying.

The guys are right - you want to amplitude modulate. Easiest way is just switch it on and off. A 555 timer's discharge pin could short the input to an audio ampilifier. If you use a LM386 it can't make enough power to hurt you.

I see same outfit you're looking at makes this gizmo
http://elcodis.com/parts/2881113/SRM400.html#datasheet
which already pulses the high frequency and that frequency is adjustable.

Have fun, be careful, and start with millliwatts.

Ok, this was VERY helpful, thank you and one more thing...can you hook up an audio source to this device?

 

[jim hardy]

Ok, this was VERY helpful, thank you and one more thing...can you hook up an audio source to this device?

I don't know - never have seen one of these for real.

It's just an on-off device controlled by pin 1
see
http://elcodis.com/parts/2881113/SRM400_p2.html#datasheet
you'd have to amplify and clip your audio, make it drive pin 1 low to send tone burst
and to prevent it from hearing an echo, remove that rightmost 6.8K resistor

That's from just a cursory glance at the documentation,
most experiments don't go so smoothly
if it's inexpensive enough to buy one just for tinkering , you'll learn from it.

It seems to be set for 38khz not 50 though. Would that do ?

Don't risk much expense on my speculation, though.old jim

 

[Sveral]

I don't know - never have seen one of these for real.

It's just an on-off device controlled by pin 1
see
http://elcodis.com/parts/2881113/SRM400_p2.html#datasheet
you'd have to amplify and clip your audio, make it drive pin 1 low to send tone burst
and to prevent it from hearing an echo, remove that rightmost 6.8K resistor

That's from just a cursory glance at the documentation,
most experiments don't go so smoothly
if it's inexpensive enough to buy one just for tinkering , you'll learn from it.

It seems to be set for 38khz not 50 though. Would that do ?

Don't risk much expense on my speculation, though.old jim

Yes, 38 kHz would do...

 

[jim hardy]

Again I'm speculating here

and i'll feel awful if you spend money on my advice that doesn't work.

If this thing costs not much,
you get a lower power transducer than that atomizer you linked
and a driver that's not powerful enough to hurt you
and a gizmo to experiment and learn with.

I've held an "ultrasonic tape measure" up to my ear , can barely hear faint clicks. Never dawned on me to try modulating it.

That TL494 IC in the other link is capable of a few watts output.
Datasheet for your proposed transducer does not say what voltage is needed to drive it.

This might work,
perhaps somebody here has more experience than me with ultrasonic transduers.

again - get a second opinion before spending money

old jim

 

[jim hardy]

This is the first time am hearing neurophone but the concept is cool. Thanks OP.

first for me, too. Thanks @Sveral

 

[Baluncore]

The Neurophone is a crank device that has no scientific basis.
The belief that it can work is all that you get.

 

[rootone]

The Neurophone is a crank device that has no scientific basis.
The belief that it can work is all that you get.

.
.

"The Neurophone is not a telephone, however, it embodies the true smart phone since it makes YOU smart. Invented in 1958, by the then 13 year-old prodigy, Patrick Flanagan, the incredible Neurophone speeds meditation, balances left and right brain functions, activates your ancient ears and boosts IQ using ultrasonic frequencies broadcast into the brain via transducers you wear on your head.

 

[Baluncore]

As I wrote earlier.

With 50kHz you will probably feel very irritated, but you will not perceive it as a sound.

Ultrasonics “bruises” the nervous system. The nerve chemistry cannot respond to such high frequencies so the nerves are chemically disturbed and take time to recover. The only way to demodulate the 50kHz is through the recovery from temporary damage to the nerves.

If you expect the Neurophone to increase your IQ then you have low IQ, or lack scientific training.
The Neurophone is more likely to lower your IQ by scrambling your brain.
Concussion can result by many different impacts. One big impact is common, 50k impacts per second is another.

 

[Drakkith]

Thread locked for moderation.

 

[Drakkith]

As Baluncore says, the Neurophone is a crackpot device that does absolutely nothing. It certainly won't make you smarter. I highly recommend that you remain skeptical about this device and take a serious look into the claims about it. I think you'll find that they follow the same pattern as most crank devices, offering you all kinds of benefits like improved IQ, improved health, etc, without having any scientific consensus as to its effectiveness. I implore you, please don't waste your time, money, or risk your own health on this.

Since we don't discuss crackpot devices here at PF, thread locked.