34 votes

Why has my tweeter speaker burned up?

Your linked description shows that the tweeter is intended to be used with a woofer for music reproduction. The description doesn't cover use of the tweeter as a specialist ultrasonic transducer on ...
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  • 2,740
30 votes
Accepted

Why sound wave is the best choice for many location detectors?

Basically, sound is slow. Using sound you can easily time how long a wave takes to travel to your object and reflect off it, thus giving you a fairly accurate distance. Light goes too fast for that, ...
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21 votes

Why has my tweeter speaker burned up?

It appears that the problem lies with the power ratings of loudspeaker components being the power rating of the system and not that of the individual component. For example, in the 1970s, Philips were ...
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  • 11k
19 votes

Why sound wave is the best choice for many location detectors?

There is some analysis at https://electronics.stackexchange.com/a/130095/9006 in answer to a question about finding the position of an object. Light, radio and heat radiation are all electromagnetic ...
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  • 9,927
15 votes

Can computer speakers emit ultrasound?

Generally, yes (confirmed by both theory and experiment) though probably not as effectively as they can lower frequencies. There are three primary factors: 1) The maximum frequency which can be ...
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12 votes

What sensors to use to read gym machine selected weight

3 come to mind. An IR encoder as RoyC mentioned. Paint the back or sides of the weights alternating white and black. A camera as you already mentioned. OpenCV would make quick work of this. And You ...
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  • 71.2k
11 votes

Why has my tweeter speaker burned up?

I'm afraid that you are another Amazon victim. I note that you have linked to an Amazon ad rather than a manufacturer's datasheet which would explain how the device is rated and expected operating ...
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10 votes
Accepted

How do ultrasonic sensors differentiate between transmitted and received signals?

But the receiver and the transmitter are placed side by side. Won't the receiver immediately pick up the signal as it is sent? How does ignore the signal as it is sent, and record it only as it ...
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  • 21.5k
10 votes
Accepted

High pitch audio frequency measuring

Most common audio equipment is set to match human hearing, 20Hz to 20kHz is their operating range. So you want to measure ultrasound, If you want only to measure high frequencies, you can use a bat ...
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  • 968
10 votes

Why has my tweeter speaker burned up?

The power ratings for audio equipment are often completely bogus. Check out the amount of copper in a 350W motor (and note that a speaker is also essentially a motor, only the motion is linear instead ...
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8 votes
Accepted

Boosting 5V/2A to +70/-70V for op-amp rails?

I would strongly recommend against attempting any sort of audio output transformer to boost the output of the op amp like is being suggested in the comments. Don't get me wrong, it is a perfectly ...
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8 votes

High pitch audio frequency measuring

By definition of the audio range for humans, beyond 20kHz is beyond audio. There are audio equipment designers such as Rupert Neve who believe the range could be wider, but this is not necessarily ...
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  • 5,759
7 votes

Measure distance using an ultrasonic sensor in a pipe

I assume the pipe is only to protect the sensor from environment noise. If the pipe is not filled with anything, then just line the inside of the pipe with sheets of sponge or foam to eliminate or ...
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  • 3,661
7 votes

Measure distance using an ultrasonic sensor in a pipe

Ultrasound Sensors measure the distance by sending an ultrasound signal and measuring the time it takes to be reflected from the object and come back. The biggest problem are reflections inside the ...
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6 votes

Can computer speakers emit ultrasound?

No. "Active" speakers with their own power supply and amplifier will usually have filters in them that roll off above 22kHz. They're not designed to be capable of emitting ultrasound, and the ...
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6 votes

Shallow underwater wireless sensor network

Here is what appears to be a very informative document entitled "Underwater Radio Communication" by Lloyd Butler VK5BR. Here are some interesting extracts. Attenuation (α) in dB/metre = 0. 0173 √(fσ) ...
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  • 388k
6 votes
Accepted

Ultrasound transducer at different frequencies

820kHz and 2.5MHz (=3*820kHz) are eigenfrequencies of the mechanical system. You will be able to drive the transducer at any other frequency, but the damping will be greater by orders of magnitude, so ...
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  • 801
6 votes

How to control the driving frequency when working with high power ultrasonic transducers

An idea once I had, but never tried, is to treat an ultrasonic transducer like a high-power crystal oscillator. Your typical crystal oscillator circuit looks like this: simulate this circuit –...
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  • 13.4k
6 votes

What will increase output volume (dB) on a Piezo Transducer?

10 Vpp is NOT the same thing as 10 Vrms. In order to get the full output from the transducer at 10 Vrms, you're going to have to drive it with a 20 Vpp square wave, or a 28.3 Vpp sine wave. With a ...
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6 votes

What sensors to use to read gym machine selected weight

I would look at it from a different angle and try to detect in which slot the metal pin is placed. This is an easier task and could be done in several ways such as using proximity sensors or micro ...
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  • 1,116
6 votes

How do ultrasonic sensors differentiate between transmitted and received signals?

There are monostatic and bistatic ultrasonic transceivers. Monostatic Monostatic transceivers are single transceivers that do the transmitting and receiving. As long as the transmission stops before ...
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  • 89
5 votes

Can computer speakers emit ultrasound?

It's best tried out. I did twice, once in the nineties, with the primitive magnetic "PC speaker" of the era, second time more recently with low end speakers embedded in a laptop. It's a quite ...
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5 votes

Can ultrasonic distance sensor be used to measure groundspeed?

I'm not aware of cheap ultrasound sensors that can measure the Doppler in the return signal. At the risk of answering something that isn't quite what you asked do you need ground speed or is air speed ...
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  • 6,802
5 votes

Why did my Ultrasonic Sensor HC - SR04 measured distance is less than half of the actual distance?

Figure 1. Oops! It appears that your scope horizontal trace is not in cal mode so all your readings are unscaled. There should be a cal test point - usually a 1 V, 1 kHz signal. Hook up the probe ...
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  • 160k
5 votes

How to remove turn on ringing/overshoot in MOSFET output for 1 MHz and 70V Switching?

what i have done 1. try to add resistor 1M or 10K in gate of MOSFET, the result : no output signal You've done that what you shouldn't do! If you check the datasheet then you'll see that the input ...
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5 votes

Measure distance using an ultrasonic sensor in a pipe

You may very well need a completely different technology than the ultrasonic. Some type of focused and targeted sensor beam reflected back from a target on the distant object may be a possibility but ...
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5 votes
Accepted

Deliver a 40kHz & >40V cosine wave to a transducer for communication

If you are going to use a class A amplifier on such a low voltage supply then might I suggest you configure the collector to drive a step up transformer. You can arbitrarily deliver what ever voltage ...
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  • 388k
5 votes

Why has my tweeter speaker burned up?

Impedance I'm going to start by addressing only one (admittedly rather minor) point raised in the question--that of the impedance. The impedance of a loudspeaker isn't a single fixed number. It's ...
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  • 2,903
5 votes

What drives mechanical piezo device ultrasound maximum (sound) power output - electrical power or voltage?

Transducers for use in water as projectors have a sensitivity specification called Transmit Voltage Response (TVR) which relates the rms voltage applied to give a Sound Pressure Level (SPL) at 1 meter ...
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  • 4,301
4 votes
Accepted

Could some one explain me technically as to why the bandwidth is severly limited in underwater channel for communications?

Acoustic communication is fundamentally limited because the channel bandwith is a function of the carrier frequency, and you cannot use high frequency carriers in acoustic applications. Wikipedia ...
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