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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]
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....(added 06/05)
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….
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 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 ….(Circuit design added 11/08)
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....(added
08/08/08)
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 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.... (electronic
design added 6/07)
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....(circuit added
06/07/08)
Ultrasonic Range Finder uses Few Components - 06/24/99 EDN-Design Ideas
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 of ultrasonic
transducers (Figure 1]. The range-finder.... [Design Idea by Daniel R Herrington,
National Semiconductor, Arlington, TX]
Ultrasonic Range Meter - This circuit is measuring the range to an object by
using ultrasonic transmitter and ultrasonic receiver. The distance is calculated by
PIC microprocessor and is displayed on the three digit 7-segment LED display.
….(electronic design added 10/06)
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....(electronic circuit added 4/05)
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]
