# Questions tagged [transducer]

A transducer is a device that converts energy from one form to another. Use this tag for questions about transducers that convert to or from electrical energy.

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### How to figure out the current drawn by a 40kHz ultrasonic transducer?

I have some 40kHz ultrasonic transducers (the same type as which you find in the common Arduino ultrasonic distance sensors.) All information comparable to a datasheet I got was: I don't get how to ...
• 131
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### Differential capacitive transducer

I would like to design a differential capacitive transducer to measure the capacitance change in an accelerometer. I cant seem to understand, how to demodulate the signal and keep the actual DC value....
1 vote
39 views

### Hall effect sensor output

I am planing to use an LF 510 -S / SP15LEM current transducer. I am expected to sense -300A to 300A. What is the output of the Hall effect? Is it mA or mV? If it is mA I will need a resistor to have a ...
40 views

### Accuracy Class and Full Scale

I am using this formula to calculate the class of an instrument: $\text{Accuracy Class} = \frac{\max{\text{(Absolute Error in Range of Measurement)}}}{\text{Full Scale Value}}$ The question is, FSV ...
50 views

### Large signal current measurements of a loudspeaker

I'm trying to work out a method of measuring electrical current through a loudspeaker load for voltages in excess of +-20 V to be read by an audio interface - I need to scale down both voltage and ...
1 vote
137 views

### VCO generating a lot of electrical noise, picked up by ultrasonic transducer

In my setup, I have a VCO CD4046 Phase Locked Loop IC generating a square wave, and an ultrasonic transducer set that transmits and receives that setup. You can imagine it looking something like this. ...
• 549
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### Offsetting an ultrasonic receiver's signal for an amplifier with a floating ground

I have an ultrasonic receiver that I'm putting through an amplifier. I've created a floating ground for the amplifier (because I want to pretend having a negative voltage supply). However, to achieve ...
• 549
1 vote
37 views

### What does 'Output load (pull up or pull down' mean on a datasheet for a pressure transducer?

I am setting up a sensor network to monitor a few things including pressure. I am going through the following datasheet, honeywell sensor, and it has a field called 'Output load (pull up or pull down)'...
1 vote
105 views

### Determine how to drive and read an unknown three wire pressure sensor

This three-wire pressure transducer pinout, drive type, and electrical specifications are unknown. It should be a typical industrial transducer. I have tried assuming it is an amplified device with a ...
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### Spark generator current limiter

I am using a spark generator for electrical discharge machining and mounted a current transducer to read the current value of the arc between workpiece and electrode. When the electrode gets too near ...
49 views

### How do you generate an impulse signal in a mechatronic system?

Background: I have a piezoelectric force transducer that I am using to measure the force produced by a combustion reaction in a tube. The issue is that there is a lot of ringing that occurs during the ...
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1 vote
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### Why do ultrasonic cleaner transducers usually have two piezoelectric discs (or rings)?

Most of the diagrams for them I've seen show that. Is it for the purpose of amplification, or some other reason?
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### Ultrasonic transducers driver review (25KHz 150Vp-p)

Transducers specs: Resonance frequency = 25 KHz +/-1KHz Maximum driving voltage = 150 Vp-p Capacitance = 2.4nF +/-20% Proposed driver circuit and simulation: Seven transducers are driven for a total ...
• 2,567
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### Is a hall effect sensor the same as a hall effect current transducer but with a current sense?

I mainly want to know the difference between a Hall effect DC current transducer (which is different from a regular AC transducer) and a hall effect sensor (I assume that both of those differ from a ...
• 553
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### Component identification - ultrasonic transducer

We have a Chinese made ultrasonic transducer, 120kHz approximately, 25mm x 25mm dia. It has three wires - red, green and white. The body is PVDF We have determined that the red and white are used to ...
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### Can this buffer provide adequate current to drive an ultrasonic transducer?

I am using a BUF634P Buffer (Datasheet) to drive a wideband ultrasonic transducer. The impedance of the transducer varies with frequency and reaches a minimum X = 100 Ω, while its resistance (...
57 views

### What sort of iron rod should I use in a magnetostriction oscillator?

I'm trying to make a magnetostriction oscillator at home. Here is the circuit diagram: 1 DC Power Supply 2 Ferromagnetic Core (Iron) 3 NPN Bipolar Junction Transistor (2N2222) 4 Capacitor C 5 Primary ...
1 vote
159 views

### How to build a circuit which allows a piezo transducer to act as both a transmitter and receiver

I am a student and am currently working on a project where I require a piezo transducer to act as both a transmitter and receiver. I am finding it difficult to build a circuit where a pulse can be ...
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1 vote
79 views

### Is a dsPIC33 suitable for creating a 40 kHz signal with 16 bits of resolution as input for ultrasonic transducers?

I'm trying to build a parametric speaker (Directional speaker) that could output a somewhat decent and high-quality sound hence why I'm aiming for a 16-bit resolution. The audio signal needs to be ...
• 161
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### What methods are there to calibrate force sensors?

I have a DIY force sensor made from velostat in a voltage divider - Arduino configuration outputing voltage to a display from an applied force to the sensor. I'm looking for sources / books / pdfs / ...
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### Cost-effective current monitoring solution for PIC

I'm in search of a cost-effective solution for monitoring the current draw in a resistive heating element using a PIC. All of the Hall Effect sensors that I've looked into seem to output the same AC ...
124 views

### Read 4wire pressure transducer via a differential amplifier

I have been trying to read a 4wire pressure transducer (M3021-000005-01KPG) with a microcontroller, but problems keep arising. First of all, I realized that the signal (0-100 mV) is differential, ...
79 views

### Can I use Op-Amps to drive a ultrasonic piezo transducer at 200kHz

I’ll admit I’m not the most knowledgeable guy when it comes to electronic circuits, so I thought I’d ask before breaking anything. I’m looking to drive a piezo transducer using a 200kHz sine wave. The ...
728 views

### Is a potentiometer an actuator or sensor?

While I was taking notes I get confused by the component named "potentiometer", I don't know in which category I should place it. If I'm correct the definition of a sensor is broadly "a ...
1 vote
29 views

### How to match Transformer output Impedance for Ultrasonic Cleaning Transducer

I have a transformer outputting the 240VAC 40kHz. The Transducer is 50W, 4100pF, 10-20 Ohm at resonance, ~40kHz resonance) The Secondary of the transformer is 12mH. I am trying to match the impedance ...
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### TRT-25 and Arduino Uno

I need help on a project I am working on. We are trying to integrate a reaction torque sensor and I am having a hard time deciding how to go about it. Previously I assumed that like my load cell I ...
154 views

### CW Doppler probe for fetal doppler and blood flow velocity

I am currently working on a microcontroller based project to measure the blood flow velocity using ultrasound doppler. I have purchased two Spengler 8 MHz continuous mode probes in order to measure ...
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### How does pulser-receiver circuit work

I want to set up an experiment exactly as given in this data sheet for the T/R switch that I recently bought (the MD0101): Every pulser receiver circuit that I’ve found neglects to address what ...
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### Reducing resonance in a piezoelectric ultrasonic transducer

I am using a piezo transducer to launch an ultrasonic pulse in air, at a frequency of 125kHz. A picture of the received waveform is attached. My question concerns how I can (electronically) limit the ...
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### What is limiting high frequency ultrasound from being high power

This is mostly just our of curiosity and I feel like I may be missing something basic, but what is limiting ultrasond transducers in the range of 500kHz-MHz from not outputting higher power like the ...
339 views

### ADC input filter design for DC input signal

My plan is to use an ADS1115 ADC to read a low impedance 0-5V output signal from a level transducer. The ADC data sheet gives guidance for ADC input filtering. This data sheet, and even other input ...
1 vote
93 views

### Parallel Resonance in Ultrasonic Transducers (Langevin)

I am working on a power-supply for ultrasonic welding machines and want to drive the transducer at its parallel resonance. The Butterworth-Van Dyke model paramters are : L = 24.73e-3; C = 1.14e-9; Cos ...
66 views

### Pressure to current conversion

I was trying to convert the pressure values (in psi) into 4-20mA current. The range of pressure values I have chosen is between 0-10Psi. But according to the link given below the pressure from 3-15Psi ...
• 11
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### communication via ultrasound

I want to communicate simple requests and ids over ultrasound. To do this I need to modulate a message onto a 40kHz carrier to drive a ultrasound transducer. Here you can find a simulation of what I ...
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### How to measure the voltage over a transducer? aka how to measure ultrasound

I want to measure ultrasound. For this task I bought a sensor, and an instrumentation amplifier. Apparently it doesn't work the way I thought because when I test it with a sample 40 kHz wave as input ...
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### Understanding the workings of an ultrasonic sensor

I am trying to simulate an ultrasonic sensor using a ray-based approach. For that, my current process can roughly be described as such: approximate wavefront using rays that mimic the shape of the ...
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### Battery powered 4-20mA sensing application

I have a base system that runs on 3-AA batteries which it regulates to a system voltage of 3.3V. I want to interface that system to measure a 4-20mA sensor. For the sake of argument, lets say that ...
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### How to simulate Magnetic Transducer Buzzer (SMT8585-03H03LF) in LTspice- any model available?

I am adding a Magnetic buzzer into the design. Buzzer part number is SMT8585-03H03LF from Bestar electronics. Below are the specifications for quick glance. Is it possible to get a LTspice model for ...
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1 vote
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### How to read the following datasheet of a sensor?

I wanted to write about static and dynamic characteristics of the Honeywell pressure 19mm transducer. I found my sensors datasheet but could not find the following characteristics mentioned in the ...
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### Questions about a wiring diagram of a transducer

I have an old current output wind-meter with the following diagram: Unfortunately there is no online documentation about the device so I had to take the above photo. I'm curious what could be the ...
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### Are ultrasonic Tx/Rx pairs really just the same sensor?

I want to retool the classic HC SR04 rangefinder to be able to do ToF gas flow sensing. I need to be able to do ToF on a column of air in both directions, so it benefits me to be able to use the ...
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### Ultrasonic transducer circuit

Can someone explain how these work ? I want to make my own ultrasonic bath, but I can't find any useful specs. Do I need some specific circuit to run them or it's just 'plug and play' ?
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1 vote
252 views

### How can I electronically generate a signal similar to the one produced by striking a piezo?

I feel like this is a bit of an unusual request so I'm having a hard time figuring out how to research it. My question is: is there some way that I can use an Arduino to programmatically generate a ...
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### What are the components of this sensor? [closed]

Attached is a schematic that looks like an accelerator or a combo sensor with plenty of inputs/output. Can you please assist in helping point out the pull up resistors, voltage regulator, and any ...
652 views

### How to determine LVDT sensitivity?

I performed an experiment using an LVDT where I used a generator voltage of 4.84V. I determined the secondary voltage at the beginning position, obtaining 2.48V and at the end (displacement os 22.5 cm)...
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### wiring Tamura 4 pin hall effect current transducer to differential daq

How do i wire a 4 pin hall sensor: 200A model below https://www.mouser.com/datasheet/2/397/L03SXXXD15-469349.pdf I don't understand the wiring schematic below I currently have +15 to pin 1, -15 to ...
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### Signal lines from transducer made common by op-amp

I am trying to amplify the difference between signal lines off of a Wheatstone bridge based force transducer. I've wired up an LM358N Op-Amp as shown below in a differential amplifier. With R1=R2=...
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### What type of ultrasonic transducers are used in medical ultrasound devices?

When I search on DigiKey for ultrasonic transducers, all I get back is the circular transducers that are sold for the various DIY projects. i.e. the picture below: However, the "medical" ultrasound ...
1 vote