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2
votes
2answers
72 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
62 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
83 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
110 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
109 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
652 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
116 views

AC current transducer symbol

What does the symbol in the red circle mean? (Product page)
0
votes
0answers
117 views

Help with ICs, 2-digit 7-segment displays, 74HC4515

Can someone show me how to connect two DC56-11YWA 2-digit 7-segment LED displays to an Arduino Uno or Mega2560 using two 74HC4515s? Is there another IC that I will need in addition? I want to display ...
2
votes
2answers
184 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 ...
1
vote
0answers
161 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
277 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. ...
2
votes
2answers
382 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
164 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 ...
10
votes
4answers
5k 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 ...
2
votes
1answer
2k 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
1k 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
335 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
3k 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 ...