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3
votes
1answer
89 views

Unwanted noise in oscilloscope display

Hi I'm a beginner on using an oscilloscope and I'm sorry if my question may be repeated in other posts. I was working on a circuit with the following materials: (1) an Al plate (5mm thick) (2) a ...
2
votes
2answers
26 views

Close range ultrasonic fluid proximity level sensor

I'm looking for a way to sense a fluid's level from above, in a small package, with a relatively low dead zone. Most commonly available ultrasonic sensors (which I would see as the best option) have ...
0
votes
1answer
115 views

How to amplify a 25khz square wave that goes from -3.3v to +3.3v so that the amplitude is doubled

I have a 3.3v power supply (lithium ion battery) and am using a TI MPS430G2553 chip to generate a 25khz square wave using 2 PWM pins and a push-pull setup. This square wave goes from -3.3v to +3.3v. ...
1
vote
1answer
94 views

Design of variable split rail power supply

I'm attempting to drive an array of piezo transducers and am struggling to find a good design capable of driving from around +-5V to +-30V at about 2A for my testing. There are about 12 sets of ...
1
vote
2answers
88 views

12V sound transducer not loud enough

I implemented the circuit below using these components: LOUDITY LD-BZEN-1212 - its description is "Sound transducer: electromagnetic; without built-in generator" and I am guessing it works like an ...
0
votes
1answer
44 views

DC-LVDT Output noise filtering

I am working with the DC-LVDT Omega 620-25 http://www.omega.com/pptst/LD620.html Manual: http://www.omega.com/Manuals/manualpdf/M4345.pdf Specs: http://www.omega.com/pressure/pdf/LD620.pdf I am ...
-3
votes
1answer
72 views

load cell continuously monitor load

I want use 50 kg of load cell of weighing machine to measure 30 kg of load for an one or two months,and load continuously decreases because of consumption on daily basis. my question is that the ...
0
votes
1answer
105 views

Driver for piezo atomizer/transducer

I am trying to drive a "piezo atomizer" which is pretty much a transducer from what I can see. The specs on the transducer are as follows: -30-50VPP -Resonant frequency fr: 190 KHz±5KHz -Resonant ...
0
votes
0answers
20 views

Effect of DC bias voltage on ultrasonic transducers when idle?

I am designing a transducer driver circuit for 1MHz transducer for ultrasonic flow metering. I am wondering if constant DC voltage applied to the sensor when idle may affect transducer's performance ...
1
vote
4answers
227 views

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

I would like to know the simplest solution to dynamically tune the driving frequency of an ultrasonic transducer to its resonance frequency. My amplifier has a power meter that I can read an optimize ...
1
vote
1answer
72 views

Problems when loading an Ultrasonic transducer (reflected power)

I have a very simple setup that is giving me problems I cannot understand: Apparently, the reflected power is the same as the power generated by the amplifier (both measured by the amplifier, ...
0
votes
1answer
129 views

Ultrasound project - voltage/current, pulse width

I need help with my ultrasound project. My plan is to generate -170 V powering voltage with MAX1847 DC/DC from 5 V. Excite the transducer (2,25 MHz, 50 ohms at resonant freq) with square wave (pulse ...
0
votes
2answers
67 views

Piezo transducer current consumption

is there any way how theoretically determine the current consumption of ultrasound piezo transducer? I only know impedance for res freq = 50 ohms and excitation voltage around -170 V. Does the Ohms ...
3
votes
1answer
97 views

Gate Driver Voltage drifting?

I am using below circuit to differentially drive ultrasonic transducer. It works almost as expected. However, I notice strange phenomenon if i observe the output at the transducer with dual gate ...
0
votes
1answer
51 views

Is there any pitfalls in converting (amplifying) analog DC signal from transducer to measurements, except noise

I need to measure force with a load cell and transmit it to a computer. The load cell outputs 2mV/V for whole range. Vdd < 12V, so I have 0..24mV signal, which I assume is enough to have good ...
2
votes
1answer
91 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
1answer
119 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
121 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 ...
1
vote
2answers
48 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
1answer
125 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
66 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
315 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
53 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
1answer
52 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
1answer
235 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. ...
2
votes
1answer
209 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
1answer
307 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: http://www.chinaultrasound.com/...
2
votes
2answers
51 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
104 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 ...
2
votes
1answer
82 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
152 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
116 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
501 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
206 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
331 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
467 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
2k 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
419 views

AC current transducer symbol

What does the symbol in the red circle mean? (Product page)
3
votes
2answers
465 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
1answer
651 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
844 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
255 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
5answers
11k 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
552 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
6k 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 ...