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Acoustic Circuits
Last Updated on: Thursday, April 07, 2016 01:00 PM

 
Circuits Designed by Dave Johnson, P.E. :
  • 40Khz Ultrasound Receiver  -  A X100 transistor Amplifier is followed by a zero cross detector circuit, using a voltage comparator.  The output is a TTL logic signal, corresponding to the received 40KHz signal . . . [Circuit by David A. Johnson P.E.,  01/29/06]

  • 40Khz Ultrasound Transducer Driver uses Medium Power  -  This crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal . . . [Hobby Circuit designed by David A. Johnson P.E.,  01/29/06]

  • Medium Power 40Khz Ultrasound Transducer Driver  -  This crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal . . . [Circuit by Dave Johnson P.E.,  01/29/06]

  • Ultrasound Receiver-40Khz  -  A X100 transistor Amplifier is followed by a zero cross detector circuit, using a voltage comparator.  The output is a TTL logic signal, corresponding to the received 40KHz signal . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/29/06]


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

40Khz Ultrasound Receiver -  A X100 transistor Amplifier is followed by a zero cross detector circuit, using a voltage comparator.  The output is a TTL logic signal, corresponding to the received 40KHz signal . . . [Circuit by David A. Johnson P.E.,  01/29/06]

 

40Khz Ultrasound Transducer Driver uses Medium Power -  This crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal . . . [Hobby Circuit designed by David A. Johnson P.E.,  01/29/06]

 

A Critter Ridder -  Ultrasonic Sound Generator…

 

An introduction to acoustic thermometry -  04/21/11  EDN Technical Article: Use an ultrasonic transducer to measure air temperature in an olive jar.… [by Jim Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.]

 

AN-285: An Acoustic Transformer Powered Super-High Isolation Amplifier -  National Semiconductor Application Note  …

 

AN597: Implementing Ultrasonic Ranging -  Microchip Application Note Published 26-Aug-97  …

Build a Simple Bat Detector -  The Simple Bat Detector is a frequency division type device. Frequency division type detectors allow you to hear ultrasonic sound by digitally scaling the frequency down into the human hearing range. For instance, a western pipistrelle bat emits ultrasonic sound in the range… [by Tony Messina-Las Vegas, NV]

 

Circuit for a Critter Ridder -  Ultrasonic Sound Generator…

 

Implementing Ultrasonic Ranging -  Microchip Application Note Published 26-Aug-97  …

 

Introduction to acoustic thermometry -  04/21/11  EDN Technical Article: Use an ultrasonic transducer to measure air temperature in an olive jar.… [by Jim Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.]

 

IR Detector/Emitter -  This is a very basic infrared detector/emitter circuit. One major downside of this circuit, is that ambient infrared light will interfere with its detecting obstacles… [Andy Wilson's site]

 

Medium Power 40Khz Ultrasound Transducer Driver -  This crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal . . . [Circuit by Dave Johnson P.E.,  01/29/06]

 

Parking Sonar -  This was one of my first designs: it is an ultrasonic parking sonar.Based on an ultrasonic amplifier from an article seen on a 1982 magazine, it was once installed on the rear bumper of my Volvo Station Wagon. It served very well for many years. Connecting it to the reverse gear lights, it switches on automatically and shows you the distance to the nearest obstacle (according to his beam) on a led scale. When the last led lights, a buzzer is also activated telling you to stop immediately… [Alberto Ricci Bitti]

 

Popular Electronics Ultrasound Detector -  The bat ultrasounds are picked up by the microphone SPKR1 and go through two stages of Amplification at Q1 and Q2. Separately, a tunable (R12) single frequency is produced by the LM567 oscillator U1. The LM567 is a tone decoder but here its input.…

 

The AD9271—A Revolutionary Solution for Portable Ultrasound -  Analog Devices-Analog Dialogue… [by Petersen, Corey and Reeder, Rob]

 

Ultrasonic Beam Barrier Circuit -  This circuit generates inaudible ultrasound to make a barrier across the entry. At the moment the circuit detects a break in the sound barrier, it generates a loud alarm indicating the entry of a person. This can be used to protects the entry passages and helps to detect unauthorized entry of persons in protected areas. The… [Circuit Posted by D Mohankumar]

 

Ultrasonic Dog Repeller Circuit -  This ultrasonic dog repeller circuit will chase away angry dogs. It is build with the all known 555 circuit, a buzzer and a little ferrite transformator. The ultrasonic frequency must be set with a dog nearby. Dog Repeller Schematic no 1 Circuit number 1 uses the well known NE555 IC, couple of components and a EE15 ferrite… [Circuit posted by Popescu Marian]

 

Ultrasonic Dog Whistle -  A novel supply voltage monitor which uses a LED to show the status of a power supply.… [by Miroslav Adzic-Serbia & Montenegro]

 

Ultrasonic Intruder detector -  Scroll for this one.  The next circuit is an ultrasonic intruder detector. It uses Doppler shift from a moving object. Ultrasonics aren't used much for this commercially as they can be a bit temperamental to set up and tend to detect cats and curtains moving in a draft. Modern detectors tend to use a narrow beam microwave system which only scans a small area such as a doorway. Ultrasonics tend to scan the whole room. … [Page's Author: Richard Torrens]

 

Ultrasonic Parking Assistant -  The basic theory behind the Parking Assistant is the Sound Navigation and Ranging (SONAR) technique that is used for finding the distance and direction of a remote object underwater by transmitting sound waves and detecting reflections from it. First, a series of short ultrasonic pulses are transmitted using a transducer that changes voltage into sound waves. The transmitted pulse is reflected off an object, and the reflected wave is then received by another transducer that converts sound waves into voltage. The transmitted signal is also known as the ‘ping’ and the received signal is known as the ‘pong’. By counting the elapsed time between the ping and the pong, the distance between the device and an object can be easily calculated by multiplying the elapsed time with the speed of sound. …

 

Ultrasonic Parking Sonar -  Based on an ultrasonic Amplifier from an article seen on a 1982 magazine, it was once installed on the rear bumper of my Volvo Station Wagon. It served very well for many years. Connecting it to the reverse gear lights, it switches on automatically and shows you the distance to the nearest obstacle (according to his beam) on a led scale. When the last led lights, a buzzer is also activated telling you to stop immediately… [Alberto Ricci Bitti]

 

Ultrasonic ParKontroller -  Are you afraid that your brand new Hummer is going to get scratched while parking it in a tight space?  Do you have trouble backing your large Mercedez S-class into your small garage?  Fear no more!  Our ultrasonic ParKontroller can sense how far you are away from the wall… [by: Chris Chan and Kenneth Liu]

 

Ultrasonic Pest Repeller -  These emit noise to confuse or agitate insects or animals.This is one of the better and more popular brands. It emits bursts of pulses at different frequencies. I did not find any spider webs inside this unit… [Reverse engineered schematic by Stepan Novotill]

 

Ultrasonic Preamp with AGC -  Scroll for this one.  The next circuit is an ultrasonic intruder detector. It uses Doppler shift from a moving object. Ultrasonics aren't used much for this commercially as they can be a bit temperamental to set up and tend to detect cats and curtains moving in a draft. Modern detectors tend to use a narrow beam microwave system which only scans a small area such as a doorway. Ultrasonics tend to scan the whole room. … [Page's Author: Richard Torrens]

 

Ultrasonic radar -  This is a very interesting project with many practical applications in security and alarm systems for homes, shops and cars. It consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered by the circuit the circuit’s  …

 

Ultrasonic Range & Imager -  This is the electronic schematic of the homebuilt SONAR. Only one piezoelectric tranducer is used for both tramsmit & receive.This transducer is switched from TX to RX via the four 4016 switches. A high gain Amplifier stage & rectifier translates the received echoes into voltage pulses. The timing is controlled by the PIC12C508 8-pin microcontroller…

 

Ultrasonic Range Finder Circuit -  The circuit is designed to be low cost. It uses a PIC12C508 to perform the control functions and standard 40khz piezo transducers. The drive to the transmitting transducer could be simplest driven directly from the PIC. The 5v drive can give a useful range for large objects, but can be problematic detecting smaller objects. The transducer can handle 20v of drive, so I decided to get up close to this level. A MAX232 IC, usually used for RS232 communication makes and ideal driver, providing about 16v of drive.… [Gerald Coe]

 

Ultrasonic Range Finder uses FeW Components -  06/24/99 EDN Design Idea   An ultrasonic, or sonar, range finder is a common sensor in robotic systems and industrial environments. Even home and automotive uses are possible. A novel sensor design consists of a WC, a few peripheral components, and a pair … [by Daniel R Herrington, National Semiconductor, Arlington, TX]

 

Ultrasonic Range Meter -  On these pages, I will introduce the Ultrasonic Range Meter with PIC16F873. As for the range meter which doesn't use PIC, refer to "Ultrasonic Range Meter". I created the PCB pattern for this circuit using EAGLE CAD. With this circuit, the following features of PIC16F873 are used.… [Seiichi Inoue's Web Site]

 

Ultrasonic Reflectance Detector -  This circuit detects motion within approximately 5 inches of a piezo-ceramic element ultrasonic transducer. The detection distance is much smaller than obtainable with other ultrasonic techniques, however, it only requires a single transducer, as opposed to the two-transducer arrangement typically found in other designs. The short-range detection is adequate for many applications, such as proximity-operated commodity dispensers or tamper alarms for merchandise cases. … [Designed by Arthur Harrison]

 

Ultrasonic Sound Detector -  Its Useful to hear Ultrasonic Sounds… [G.L. Chemelec, designer]

 

Ultrasonic Switch (AndreW Wilson) -  The circuit described generates (transmits) ultrasonic sound of frequency between 40 and 50 kHz. As with any other remote control system this cirucit comprises of a mini transmitter and a receiver circuit. Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from the transmitter and switches on a relay… [Andy Wilson's site]

 

Ultrasonic Transducer Oscillator Circuit -  ASCII format…

 

Ultrasonic transmitter -  These ultrasonic circuits are all quite old: my notes date them at mid-70s so they don't use ICs. Nevertheless there are several places where an op-amp would possibly simplify things. Despite their age I hope they are of interest: certainly basic principles don't change. … [Richard Torrens]

 

Ultrasound Detector -  The bat ultrasounds are picked up by the microphone SPKR1 and go through two stages of amplification at Q1 and Q2.Separately, a tunable (R12) single frequency is produced by the LM567 oscillator U1. The LM567 is a tone decoder but here its input is grounded and its voltage controlled oscillator is used as a precision oscillator… [New Jersey chapter of the Society for Amateur Scientists]

 

Ultrasound Receiver-40Khz -  A X100 transistor Amplifier is followed by a zero cross detector circuit, using a voltage comparator.  The output is a TTL logic signal, corresponding to the received 40KHz signal . . . [Hobby Circuit designed by Dave Johnson P.E.,  01/29/06]

 

Utrasonic Preamp with Twin T tuning -  These ultrasonic circuits are all quite old: my notes date them at mid-70s so they don't use ICs. Nevertheless there are several places where an op-amp would possibly simplify things. Despite their age I hope they are of interest: certainly basic principles don't change. … [Richard Torrens]

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Acoustic Circuits


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