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2
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1answer
41 views

Ultrasound transducer at different frequencies

An ultrasound transducer is specified to have two standard frequencies; 820 KHz, and 2.5 MHz, does this mean that any frequency in-between can be used? If not, what would happen if a generated signal ...
0
votes
0answers
29 views

Why output is zero in TIP 31 as CC mode [duplicate]

I am using an Arduino Uno board and R-2R DAC to obtain a signal which should vibrate a transducer connected across R19 of common collector amplifier using TIP31C. I need about 300mA of current to ...
0
votes
1answer
59 views

Need help in biasing TIP31 in common collector mode- edited

I am using an Arduino Uno board and R-2R DAC to obtain a signal which should vibrate a transducer connected across RL of common collector amplifier using TIP31C. I need around 300mA of current to ...
0
votes
2answers
81 views

What kind of Ultrasonic Transducer is capable of 85db at 25khz-40khz using 5vdc and is 1cm diameter?

I'm building a dog training device. I don't want to zap or shock the dog, but just produce an ultra-sonic sound that will discourage current behavior. I tried an online schematic and it didn't get ...
0
votes
2answers
37 views

Medical Ultrasonography Phased Array Beamforming

Medical ultrasonography equipment images the interior of the body by reflecting ultrasonic sound waves off of discontinuities between internal tissues / organs. I did some reading about this ...
2
votes
0answers
84 views

Explain this schematic

I am taking apart this non-invasive blood pressure monitor to see how it works. The engineer decided to use (what looks like a piezo-electric element to measure the relative pressure from the cuff, ...
1
vote
2answers
30 views

Parallel Piezo Pickup Problem

I've an electronic drum machine - which involves electronic drum pads with piezoelectric transducers in them (which pick up you hitting the pads with your drum sticks) which feed into a magic drum ...
1
vote
2answers
79 views

Ultrasound transducer excitation - frequency, transistor type

I currently work on my ultrasound project. I need to excite my Olympus V305-SU-F tranducer with -100 V spike pulses. Unfortunately Olympus does not provide any kind of datasheet. I know only value of ...
0
votes
1answer
28 views

Comparator with latch as trigger

I was hoping to use a Linear Comparator with a latch such as LT1016 as a trigger for the Register output clock for a 74HC590. The 74HC590 is going to be cascaded with it's RCO going to several more ...
0
votes
0answers
28 views

Transducer - Tension drop and rising pulse time increasing

I'm working on an echograph project and I have some problem with the transducer, could you help me please? I generate a high pulse voltage of -150V. When I plug the transducer, the tension is droping ...
0
votes
1answer
40 views

Need 300mA current to drive a transducer

I am working on a project in which I need to use a preloaded value to vibrate a transducer. So loaded required values into Arduino Uno, converted into analog values using R-2R DAC and buffered values ...
0
votes
0answers
49 views

DIY ultrasonic cleaner - will it work?

I want to build some simple ultrasonic cleaner and I wonder: is my idea going to work? The plan is: Build a container from metal sheets or just find/buy some container. Buy something like 60W 40 kHz ...
0
votes
1answer
109 views

Where can I find a transformer that will step up a 12v input to around 400v?

So i'm trying to build an ultrasonic levitator by following the build on mike's electric stuff's channel h ttps://youtu.be/qy1w6rTpC2g . I've set everything up same as he did, following the schematic. ...
0
votes
0answers
28 views

Uncertainty Calculation of LVDT displacement transducers for length measurement

I have to calculate the uncertainty of measurement for an LVDT Linear displacement transducer used for measuring length. Uncertainty calculations are ruled by ISO 17025 but there are no (at least ...
2
votes
1answer
109 views

40 kHz ultrasonic transducer making an audible sound

I have a 40 kHz ultrasonic transducer that transmits a pulse. The pulse is generated by switching a phase shift oscillator on and off with a NE555 timer. For some reason the sender is making a faint ...
0
votes
0answers
23 views

Trying to design a Automatic Return AC Filter Roll System

I get tired of changing my home AC unit air filter out all the time so I was going to try and design a rolled filter material that would automatically spool up/down till it get clean filter material. ...
0
votes
0answers
73 views

How do i impedance match two complex impedances?

If i have a source and load both having resistive and capacitive parts to it, what is the best way to go about matching the loads? The source impedance has low resistance around 15ohms but the load ...
0
votes
1answer
194 views

Ultrasonic transducer for fish finder - TD02002

I am looking to construct an MCU based ultrasonic fish finder. I have found a potential component that is a transducer called the TD02002 which can be found here: ...
2
votes
2answers
49 views

How responsive are current transducers?

We are using an (XD-V5-01) to measure an AC current but what we are not sure of is how responsive devices like this are. Do they accurately reflect the current being measured instantly (100-200 ms)? ...
0
votes
1answer
73 views

Question about clearance/pad diameter and PCB design

Sorry if this is a silly question but I am relatively new to Eagle and I am 100% new in dealing with high powered PCB design. So, I am making the footprint for the LEM LV 25-P voltage transducer seen ...
0
votes
0answers
54 views

Piezo sandwich transducer design

All my research has found designs for half-wavelength transducers. First question -- do acoustic transducers need to be half-wavelength? I'm assuming they operate under different dimensions, so what ...
2
votes
1answer
78 views

Sonar single transducer element SNR vs array SNR

Background: I'm taking a flexible learning unit on radar and sonar systems in a vocational college for an assoc. degree level course. The teacher has given us a reading assignment: "Chapter 15 ...
-2
votes
1answer
125 views

Wheatstone Bridge question

Need help on Wheatstone bridge circuit. The question is- Calculate the value of the distant unknown resistor Rx at the end of a loop,in a Wheatstone Bridge configuration.The three known resistors ...
3
votes
2answers
109 views

Is it absolutely necessary to correct for a temperature drift in the resonant frequency of an ultrasonic transducer?

I'm designing a device which will use ultrasonic transducers in a way similar to sonars. Is it absolutely necessary to correct for the drift in the resonant frequency due to temperature fluctuations? ...
1
vote
2answers
298 views

What is the current consumed by Ultrasonic Sensors/Transducers (1-2MHz) to generate Ultrasound waves

I would like to know what is the current consumed by a 1-2MHz Ultrasonic Sensor (i.e sensors used for Clamp on Ultrasonic flowmeter) to generate Ultrasound waves. The two ultrasonic sensor ...
-3
votes
2answers
176 views

What kind of circuitry to be used? [closed]

A pressure transducer device is outputting 0 to 5V range voltage. So when the applied pressure is negative it is still zero. The device can only output positive voltage. This same device output can ...
1
vote
1answer
272 views

What is the pressure/force sensor used in the Beddit?

The Beddit sleep-tracking device (Beddit and @indiegogo) has a pressure sensor that looks like a thin (~0.3mm?), flexible tape about 2ft long. The tape seems to be constructed of several layers ...
0
votes
1answer
354 views

Measuring the efficiency/acoustic power of a transducer

I was wondering what was the best and the simplest way of measuring the efficiency of a transducer. Finding the output acoustic power in respect to the electrical input power under a water medium.
1
vote
1answer
1k views

Is there a standard symbol for a pressure sensor?

I am using Eagle to design a PCB that includes an analog pressure sensor. However, I can't seem to find if there is any standard symbol for the device. There isn't anything on the datasheet. I began ...
0
votes
3answers
328 views

AC current transducer symbol

What does the symbol in the red circle mean? (Product page)
3
votes
2answers
359 views

Measuring the resonance point of a piezo ultrasonic transducer

I assume it will be something along the lines of feeding it a sine wave via a resistor and measuring the signal across the resistor as the frequency changes. Does this sound viable? Also, on resonance ...
0
votes
0answers
310 views

Measuring radon levels

I saw a commercial full built sensor/alarm which can measure it but I cannot find any IC with that function. What is the type of component to use to measure radon level in the air?
0
votes
1answer
541 views

Use CT current sensor to measure AC current of a single device

So I recently bought 3 current transformers with the goal to measure the current of 3 washing machines. All I want to measure is if the machines are running or not so accuracy isn't really a concern. ...
3
votes
2answers
689 views

ratiometric ADC, is it feasible to separate reference voltage and excitation voltage by an amplifier

I have a variety of bridge transducers (pressure, strain gage) with sensitivity of 1mV/V. Also, most 24-bit ADCs and analog frontend chips have a PGA with programmable gain between 1-128. This means ...
2
votes
1answer
230 views

Pros and Cons of 3 Different Transducers

What are the pros and cons of using these different transducers? I can't find see what the difference would be between either of them? I mean, they are all used in converting energy right? Linear ...
12
votes
4answers
10k views

Driving 50W-250W ultrasonic transducers with sine: Any Class B 135KHz monolithic power amp ICs?

My project needs to drive a medium power ultrasonic piezoelectric transducer from a sine wave (/ sawtooth) sweep generator that sweeps +/- 2% of the transducer resonant frequency. The question: What ...
3
votes
1answer
3k views

Ultrasonic Transducer driver

I found some youtube vids on Ultrasonic Cleaning, and thought it would be a cool DIY project. On eBay I found this. Some other transducers in the same range requires 400-800V supply. Anyone have any ...
4
votes
1answer
2k views

Sensor/transducer for low pressure gas measurement?

First time poster here so let me know if I'm missing key info. I'm helping a friend create an Arduino-powered data collection system for his coffee roaster, and we'd like to track the natural gas ...
0
votes
1answer
487 views

Current Transducer with true RMS voltage output [duplicate]

Possible Duplicate: ICs that convert an AC signal into its true rms value Can anybody please recommend me a current transducer which has the provision of true RMS voltage output and ...
2
votes
1answer
5k views

Thermocouple array for generating free electrical energy?

Thermocouple is a material (junction between two different metals) which generates potential difference in terms of millivolts, isn't it? Why don't we create a matrix of thermocouples (many ...