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.

Using rotary encoders to provide digital data that can be readily used in computer control applications. How they work, how to use them, and how to make them from discrete components. Includes circuits for use with stepper motors and an exercise bike speedometer.
COMPUTERCRAFT Feb 1993 (v.3#2) pg. 18

Circuit for an electronic device to measure the speed of automobiles passing over two detectors.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1979 (v.35#4) pg. 101

Digital tachometer (0-9990 rpm) for your car also has a rapid-read analog display consisting of a curved line of 20 LEDs. Instructions included for adapting it for use as a speedometer. Est. cost: $75 (kit).
ELECTRONICS EXPERIMENTERS HANDBOOK 1989 pg. 43, 48, 141, 143, 150

Dual peak/current anemometer displays both the current windspeed and the highest gust measured. May also be configured for use as a peak-reading speedometer or tachometer. Est. cost: $40.
HANDS-ON ELECTRONICS Fall 1984 (v.2#2) pg. 39

Bike speedometer circuit measures speed by sensing light from a spoke-mounted reflector on your wheel.
HANDS-ON ELECTRONICS Nov 1986 (v.3#6) pg. 26

What to do about a noisy or broken speedometer.
HOME MECHANIX #716 Dec 1987 (v.83) pg. 73

Speedometers for all types of boats.
MECHANIX ILLUSTRATED #478 Mar 1968 (v.64) pg. 93

How to test speedometers and tachometers for accuracy, replace them and maintain the cables and wiring.
MECHANIX ILLUSTRATED #575 Apr 1976 (v.72) pg. 88

Electronic system to measure the airspeed of model aircraft is created by combining an electronic stopwatch, walkie-talkies, and a modified R/C transmitter.
MODEL AVIATION Mar 1990 (v.16#3) pg. 80

Using a tripod-mounted radar gun to determine the speed of R/C model aircraft.
MODEL AVIATION Mar 1992 (v.18#3) pg. 70

Circuit for a speed trap. Help slow down speeds in your driveway with this circuit which will flash a warning if cars go too fast. Est. cost: $9.
MODERN ELECTRONICS [1] Sep 1978 (v.1#7) pg. 37

Schematic shows a general design for a photoelectric digital speedometer for an automobile. More work must be done to refine the design.
MODERN ELECTRONICS [1] Dec 1978 (v.1#9) pg. 8

How to determine the amount of error in your motorcycle speedometer.
MOTORCYCLIST #1123 Nov 1990 pg. 88

Speed trap timer measures either lap speed or instantaneous speed at any point. Phototransistors operate as switches. Operates in two ranges, 5-50 and 50-500 mph.
POPULAR ELECTRONICS [1] Nov 1972 (v.2#5) pg. 43

Build a digital speedometer for your car. Linear readout uses 7-segment LED's. Converts the standard 1000 revolutions per mile of your speedometer cable to an electrical signal to drive a two-digit readout.
POPULAR ELECTRONICS [1] Sep 1976 (v.10#3) pg. 42

Build a digital bicycle speedometer. LED readouts indicate speed from 1 to 99 miles per hour. Uses magnets mounted on the rim of wheel to trigger a switch on each revolution.
POPULAR ELECTRONICS [1] Mar 1977 (v.11#3) pg. 39
Correction POPULAR ELECTRONICS [1] Jul 1977 (v.12#1) pg. 7
Correction POPULAR ELECTRONICS [1] Aug 1977 (v.12#2) pg. 6

Build Cruisealert, a 55 MPH speed-limit alarm. Estimated cost: $30.
POPULAR ELECTRONICS [1] Feb 1979 (v.15#2) pg. 57

Build a microwave-radar speed gun. Est. cost: $100 (kit) plus 12-volt power supply.
POPULAR ELECTRONICS [2] Jun 1995 (v.12#6) pg. 37

Electronic speed-minder can be set for a maximum speed and will set off an alarm if that speed is exceeded.
POPULAR MECHANICS Jun 1970 (v.133#6) pg. 132

How to troubleshoot your car's speedometer.
POPULAR MECHANICS Mar 1971 (v.135#3) pg. 136

Build an inexpensive 2-digit digital speedometer for your bike. Measure speeds up to 99 mph. Est. cost: $40.
POPULAR MECHANICS Feb 1978 (v.149#2) pg. 38G

How to measure the speed of any rotary power tool to an accuracy of 3% using a pitch pipe and the chart of musical frequencies supplied with this article.
POPULAR SCIENCE Feb 1970 (v.196#2) pg. 104

Build a digital bicycle speedometer. Measures up to 30 mph by using 12 discrete LEDs as speed indicators rather than two 7-segment LEDs. Powered by rechargeable nicad batteries.
RADIO-ELECTRONICS Feb 1978 (v.49#2) pg. 37

Simple circuit incorporating a DC motor is used to measure the rate of any rotating object. Use as a speedometer or tachometer.
RADIO-ELECTRONICS Mar 1981 (v.52#3) pg. 70

Convert your old calculator into a tachometer, light meter, or speedometer among other items.
RADIO-ELECTRONICS Mar 1982 (v.53#3) pg. 70

Build this digital speedometer for your car. Dual display delivers both an accurate 3-digit readout and a rapid-read analog display.
RADIO-ELECTRONICS Jul 1987 (v.58#7) pg. 47, 79
Correction RADIO-ELECTRONICS Nov 1987 (v.58#11) pg. 13
Correction RADIO-ELECTRONICS Jan 1988 (v.59#1) pg. 24

Baseball velocity timer. Breaking an aluminum strip with an object starts the timer, and breaking a second strip two feet later stops timer. Velocity is then calculated. Timer is actually a DC voltmeter which measures the amount of electricity stored in an electrolytic capacitor in the interval between breaking of the first and second strips.
RADIO-TV EXPERIMENTER Jun-Jul 1969 (v.26#3) pg. 59

Correcting your automobile speedometer and odometer readings.
SKINNED KNUCKLES #205 Aug 1993 (v.18#1) pg. 22

Replacing automobile speedometer cables and determining the cause of breakage.
SKINNED KNUCKLES #223 Feb 1995 (v.19#7) pg. 21
Added Info SKINNED KNUCKLES #225 Apr 1995 (v.19#9) pg. 32

Diagnosing speedometer trouble. Excerpts from bulletins issues by AC Spark Plug Division of General Motors (Dec 1945).
SKINNED KNUCKLES #278 Sep 1999 (v.24#2) pg. 12

How to make and use a "chip log" to calculate the speed of a boat.
SMALL BOAT JOURNAL #55 Jun-Jul 1987 pg. 93

Simple speedometer for a boat will measure up to 10 mph. Made from clear plastic tubing and a wooden stick.
STEAMBOATING #30 Nov-Dec 1989 pg. 27

Device for calculating the speed of a boat is made from a length of line and a tennis ball.
STEAMBOATING #46 Jul-Aug 1992 pg. 29

A water speed gauge that works. Building, installing and using a monometer (a device to measure the pressure of liquids and gases) to serve as a boat speed gauge.
WOODENBOAT #111 Mar-Apr 1993 pg. 47

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