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35 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 ...
Graham Nye's user avatar
  • 4,423
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 ...
vu2nan's user avatar
  • 18.8k
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 ...
Passerby's user avatar
  • 73.2k
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 ...
Transistor's user avatar
  • 177k
11 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 ...
Dmitry Grigoryev's user avatar
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 ...
Peter Smith's user avatar
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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 ...
Juan's user avatar
  • 1,158
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 ...
Graham's user avatar
  • 6,180
7 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 ...
Tryphon's user avatar
  • 109
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 ...
AJN's user avatar
  • 3,891
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 ...
w7sbc's user avatar
  • 126
7 votes

MEMS microphone encode to AAC low performance

I have a small microcontroller that is very low power but that lacks the RAM required for encoding so I am looking for simplest possible solution. Get a better microcontroller; that's really all. ...
Marcus Müller's user avatar
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 ...
Dave Tweed's user avatar
  • 175k
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 ...
rrz0's user avatar
  • 1,191
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 ...
Andrew's user avatar
  • 6,912
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 ...
Transistor's user avatar
  • 177k
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 ...
Rohat Kılıç's user avatar
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 ...
Michael Karas's user avatar
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 ...
Andy aka's user avatar
  • 464k
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 ...
Jerry Coffin's user avatar
  • 3,514
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 ...
qrk's user avatar
  • 10.2k
5 votes
Accepted

Wake up microcontroller using ultrasonic sensor

That simple transmitter circuit seems OK. You might reduce R1's value a tad. Receiver circuit has problems. A variable threshold level might be in order via R5 (1k trimpot) below. It is easiest to ...
glen_geek's user avatar
  • 26.6k
5 votes
Accepted

Is an RF sampler a good way to protect my network analyzer during high voltage impedance measurements?

The diagram you showed is for measuring a 2-port device, not a 1-port. Each port is shown as a single point on the DUT block rather than as two distinct terminals, and each transmission line is shown ...
The Photon's user avatar
  • 131k
4 votes

Using PWM output from ATMega to provide external clock to external 3.3V device

If you follow your TDC1000-TDC7200EVM link, it takes you to the User's Guide. p35 shows the schematic for the EXT_OSC input. You'll see that it has a 51.1ohm load resistor across EXT_OSC input and its ...
TonyM's user avatar
  • 23.4k
4 votes

What sensors to use to read gym machine selected weight

Put a small infra red reflector on each block and arrange these in a vertical line. Your sensor set up is an IR illuminator and a directional IR sensor (photo-diode or transistor in a tube) mounted to ...
RoyC's user avatar
  • 10.1k
4 votes
Accepted

Alternative to a potentiometer to regulate 50 W

Don't try to scale down the 50 W signal coming out of the driver. Instead, control the driver circuit to produce a lower amplitude signal. This is the same concept as a volume control for audio. ...
Olin Lathrop's user avatar
4 votes

How to amplify a signal for piezo transducer from 1 Vpp to 200 Vpp at 400 kHz and 500 pF load

As this is a fixed frequency application, tuning out the capacitance with an inductor would improve things dramatically. There's a choice to either do this in parallel, and drive the resulting tank ...
Neil_UK's user avatar
  • 169k
4 votes
Accepted

Refraction vs Reflection in Ultrasonic sensor for water level detection

You can neglect the part of sound intensity entering the water. What happens at the surface is illustrated here: (Source: https://de.wikipedia.org/wiki/Datei:Partial_transmittance.gif) The more ...
Curd's user avatar
  • 16.3k
4 votes
Accepted

Unit of ultrasound A-scans

The amplitude is just arbitrary units for relative measurements only. The absolute values don't really matter all that much. The peaks in the graph represent changes in tissue properties — ...
Dave Tweed's user avatar
  • 175k
4 votes

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

Your DC blocking capacitor forms a high pass filter in combination with the input impedance of the amplifier. The input impedance is less than 100 ohms, giving a cutoff of over 200kHz. Your DC blocker ...
JRE's user avatar
  • 72.3k

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