Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
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Build a universal electronic stopwatch. Displays elapsed time up to 59 minutes 59.99 seconds. Also allows you to time single and multiple events in several ways. Powered by four D-cells.
HANDS-ON ELECTRONICS Mar-Apr 1986 (v.3#2) pg. 31

Digital stopwatch uses only one integrated circuit. Displays time on an LED display. Powered by 3 AA batteries. Est. cost: $20.
INDUSTRIAL EDUCATION Oct 1982 (v.71#7) pg. 27

Electronic stopwatch can count up to 999 events at any speed up to 10 million counts per second. Est. cost: $50 to $80.
POPULAR ELECTRONICS [1] Mar 1968 (v.28#3) pg. 27

A digital stopclock for short and long event timing. Times events up to 10 hours in 0.1 second intervals. Est. cost: $75.
POPULAR ELECTRONICS [1] Jan 1976 (v.9#1) pg. 48

How to use the Hewlett-Packard HP-45 calculator as a stopwatch or elapsed-time indicator.
POPULAR ELECTRONICS [1] Jun 1976 (v.9#6) pg. 67

Circuit for an electronic stopwatch using the Intersil stopwatch IC, type ICM 7205. Features a timing rate of up to 59 minutes 59.99 seconds in 0.01 second increments.
POPULAR ELECTRONICS [1] Aug 1976 (v.10#2) pg. 73

Build a miniature digital stopwatch. Times from 0.01 second to 59 minutes 59.99 seconds in either split or Taylor mode. Uses three AAA cells for power. Fits in a palm-size plastic case. Est. cost: $40.
POPULAR ELECTRONICS [1] Dec 1976 (v.10#6) pg. 57

How to convert a "four-banger" calculator for stopwatch functions.
POPULAR ELECTRONICS [1] Aug 1977 (v.12#2) pg. 56
Correction POPULAR ELECTRONICS [1] Oct 1977 (v.12#4) pg. 14
Correction POPULAR ELECTRONICS [1] Dec 1977 (v.12#6) pg. 6

Circuit for a two-digit counter with a crystal-controlled timebase that can be used as a stopwatch or modified for other applications.
POPULAR ELECTRONICS [1] Jan 1980 (v.17#1) pg. 93

Electronic stopwatch setup measures the speed of a bullet as it passes through two triggering screens one foot apart.
POPULAR SCIENCE Jul 1969 (v.195#1) pg. 144

Convert your old calculator into a (1) digital capacitance meter, (2) digital ohmmeter, (3) digital stopwatch, (4) shutter-speed tester, (5), tachometer, (6) light meter, or (7) speedometer.
RADIO-ELECTRONICS Mar 1982 (v.53#3) pg. 70

Using the "Kaltek" RC-103 module, along with common components and a simple calculator, to build an instrument to measure resistance, capacitance, temperature, RPM, length, or angles. May also be used as part of a stopwatch or light meter.
RADIO-ELECTRONICS Jan 1985 (v.56#1) pg. 79

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