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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

xx   SOUND

Combine automatic sonar ranging and infrared-light detection in a computer-controlled scanner. Uses a Polaroid Ultrasonic Ranging System.
BYTE Nov 1980 (v.5#11) pg. 32

Build an ultrasonic rangefinder (distance-measuring system) that connects to a computer via the RS-232 serial port.
COMPUTERCRAFT Jun 1992 (v.2#6) pg. 47

Experimenting with the Polaroid Ultrasonic Ranging system.
COMPUTERS & ELECTRONICS Jun 1983 (v.21#6) pg. 84
Added Info COMPUTERS & ELECTRONICS Oct 1983 (v.21#10) pg. 102

Ultrasonic receiver. Extend the upper frequency range of the human ear with this high-frequency superheterodyne receiver. Est. cost: $35 (kit).

Ultrasonic radar. An ultrasonic rangefinder measures distances to surrounding objects (up to 35-ft.) while rotating through 360-degrees. The resulting information is transmitted to a PC (via the Experimenter I/O board) and displayed like a radar image.
ELECTRONICS NOW Sep 1993 (v.64#9) pg. 31

Ultrasonic-listening circuit.
ELECTRONICS NOW Jul 1999 (v.70#7) pg. 3

Building an ultrasonic plant stimulator.
MOTHER EARTH NEWS #87 May-Jun 1984 pg. 102

Ultrasonic amplifier uses high-frequency sound to drive away insects and other pests. Est. cost: $30.
POPULAR ELECTRONICS [1] Jul 1972 (v.2#1) pg. 47

Experimenting with phase-locked loops. Circuits include an ultrasonic switch, tunable filter, touch switch, and SCA decoder.
POPULAR ELECTRONICS [1] Oct 1975 (v.8#4) pg. 47
Correction POPULAR ELECTRONICS [1] Dec 1975 (v.8#6) pg. 6

Ultrasonic superheterodyne receiver extends the upper frequency range of the human ear. Hear sounds from a range of 15 kHz to near 40 kHz. Est. cost: $35.
POPULAR ELECTRONICS [2] Feb 1989 (v.6#2) pg. 46

Tunable ultrasonic receiver circuit can be used to seek out and pin-point unheard sounds. Built around a 4046 phase-locked loop IC.
POPULAR ELECTRONICS [2] Sep 1989 (v.6#9) pg. 102

Ultrasonic CW transceiver makes learning Morse code more interesting. The transceiver operates up to 200 ft., requires no license, and has built-in features which simulate using a real amateur-radio transmitter.
POPULAR ELECTRONICS [2] Jul 1990 (v.7#7) pg. 55

Bug-Off. Build an electronic pest repeller which sends out ultrasonic pressure waves (at 22-65 kHz) that are an annoyance to insects and some small animals.
POPULAR ELECTRONICS [2] Apr 1991 (v.8#4) pg. 36
Added Info POPULAR ELECTRONICS [2] Jul 1991 (v.8#7) pg. 3

Ultrasonic-frequency generator circuit.
POPULAR ELECTRONICS [2] Oct 1991 (v.8#10) pg. 25

Circuits includes three ultrasonic generators and two ultrasonic receivers.
POPULAR ELECTRONICS [2] Dec 1994 (v.11#12) pg. 72

Ultrasonic remote-control tester converts signals into an audible frequency.
POPULAR ELECTRONICS [2] May 1995 (v.12#5) pg. 29

Circuit for an ultrasonic pest repeller. Emits ultrasonic sound waves between 65,000 and 25,000 hertz. Est. cost: $20.
RADIO-ELECTRONICS Aug 1983 (v.54#8) pg. 96
Correction RADIO-ELECTRONICS Feb 1984 (v.55#2) pg. 20

Ultrasonic pest repellers. Includes circuits for experimenting with the effects of continuous or pulsed high-frequency signals.
RADIO-ELECTRONICS Jul 1985 (v.56#7) pg. 61
Added Info RADIO-ELECTRONICS May 1986 (v.57#5) pg. 6, 8, 9

Ultrasonic "vision" circuits for use in robotics.
RADIO-ELECTRONICS Nov 1985 (v.56#11) pg. 89

Ultrasonic rangers and stepper motors as used in robotics.
RADIO-ELECTRONICS Dec 1985 (v.56#12) pg. 88