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PHOTOGRAPHIC DARKROOM TIMER entries in Index to How To Do It Information
Norman Lathrop Enterprises  
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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   TIMER

Tip on using a small tape recorder to time film processing and listen to music at the same time.
CAMERA & DARKROOM Nov 1993 (v.15#11) pg. 13

A comparison of sixteen photogaphic darkroom timers that are commercially available.
CAMERA 35 Apr 1975 (v.19#2) pg. 47

Annual timer buying guide. Part 1.
DARKROOM PHOTOGRAPHY Mar-Apr 1979 (v.1#1) pg. 67

Annual timer buying guide. Part 2.
DARKROOM PHOTOGRAPHY May-Jun 1979 (v.1#2) pg. 47

Build a digital photographic processing timer. Counts up to 9 minutes, 59 seconds. Displays time on a digital clock. Est. cost: $30-$40.
DARKROOM PHOTOGRAPHY May-Jun 1981 (v.3#3) pg. 56

How to choose a darkroom timer. (Buying guide).
DARKROOM PHOTOGRAPHY Nov 1981 (v.3#7) pg. 25

How to use a small portable cassette recorder to audibly time your various film and print processing steps. A separate tape for each type of process speeds up selection.
DARKROOM PHOTOGRAPHY Jul-Aug 1983 (v.5#5) pg. 55

Darkroom timer buying guide.
DARKROOM PHOTOGRAPHY Mar-Apr 1984 (v.6#2) pg. 32

Tip: Use a pre-recorded tape to time darkroom operations.
DARKROOM PHOTOGRAPHY Mar-Apr 1987 (v.9#2) pg. 20

Tip: Use coins to help keep track of the time in the darkroom.
DARKROOM PHOTOGRAPHY May-Jun 1987 (v.9#3) pg. 7

Tip: Use a prerecorded cassette to time various darkroom tasks.
DARKROOM PHOTOGRAPHY Nov 1988 (v.10#4) pg. 14

Build an electronic audible interval timer which beeps at 15-second or 30-second intervals. Ideal for use in darkroom processing.

How to modify the Radio Shack 28-4032 timer kit for use as an enlarging timer which goes from 2 to 45 seconds in 10 steps (each of which is 41% longer than the previous one).
ELECTRONICS NOW Feb 1996 (v.67#2) pg. 8

Solid-state darkroom timer goes from 0.1 to 99 seconds.
ELECTRONICS WORLD Jun 1971 (v.85#6) pg. 66

Versatile electronic darkroom timer. Will turn enlarger on and off or will buzz after a preset elapsed time. Has controls for reset, start, and manual/auto. Has three timing ranges: 0-15 seconds, 0-150 seconds, and 0-20 minutes.
ELEMENTARY ELECTRONICS Jan-Feb 1974 (v.14#1) pg. 49

Photographic print timer features illuminated digit-set dials, automatic reset and controls the safelight. Times from 1 to 119 seconds.
ELEMENTARY ELECTRONICS May-Jun 1975 (v.15#3) pg. 41

Photo firefly. Provides both audio and visual 1-second and 10-second output pulses from a built-in speaker and LEDs. Pulses are triggered from the 60-Hz AC line which provides power.
ELEMENTARY ELECTRONICS Nov-Dec 1975 (v.15#6) pg. 63

Timer measures intervals from 10 seconds to 5 minutes 50 seconds (or longer). Meter on the panel moves from full scale at start of the interval, down to zero as the time elapses. It gives you some idea of how much time is still left. Turns enlarger or other electric device off at the end of the cycle.
ELEMENTARY ELECTRONICS Nov-Dec 1977 (v.17#6) pg. 33

Use a twelve hour LED and an electronic clock module to make a 9:59 timer. This timer, which indicates up to nine minutes, fifty nine seconds, is useful in color and black & white film processing, paper processing and enlarging. Est. cost: $25.
ELEMENTARY ELECTRONICS Jan-Feb 1978 (v.18#1) pg. 52

Automatic darkroom timer turns on the enlarger for a prescribed length of time, turns off the safelight, gives audible indication of elapsed time, and automatically resets everything at the end of the timing cycle.
HANDS-ON ELECTRONICS Fall 1984 (v.2#2) pg. 33

Circuit for a darkroom timer which radiates a light pulse from an LED at one-second intervals.
HANDS-ON ELECTRONICS Nov 1986 (v.3#6) pg. 27

Darkroom timer circuit will call your attention to the timer by sounding a tone before the clock times out.
HANDS-ON ELECTRONICS Jun 1987 (v.4#6) pg. 97

Darkroom master. Programs and interface allow a PET computer to control photo darkroom enlarger and safelights, plus sequentially time the processing of film, prints, or slides.

An H8 computer in the darkroom. BASIC program converts the Heath H8 computer into a photo timer by using the LED's, keypad, and front-panel speaker.

TRS-80 in the darkroom. Use a computer for programmed timing of multi-step processes, such as color photo processing. Includes a process program written in BASIC.
KILOBAUD MICROCOMPUTING #49 Jan 1981 (v.5#1) pg. 118

Electronic timer to control small kitchen appliances such as food mixers, blenders, etc. Times up to 60 seconds. Can be used as darkroom timer. Handles up to 1000 watts.
MECHANIX ILLUSTRATED #548 Jan 1974 (v.70) pg. 24

Egg timer or darkroom timer circuit lets you select a time period up to 7 minutes. After the selected period has elapsed, an alarm will sound for a short time, then turn off. Est. cost: under $10.
MODERN ELECTRONICS [1] Feb 1978 (v.1#1) pg. 49
Added Info MODERN ELECTRONICS [1] Jun 1978 (v.1#4) pg. 14

Tip: Simple modification allows your darkroom timer to be mounted on the wall, yet moved from place to place as needed.
MODERN PHOTOGRAPHY Aug 1977 (v.41#8) pg. 94

3 darkroom projects. (1) Install enlarger timer and power switch in the wall, wired to appropriate outlets. (2) "OR" box allows 2 timers to control 1 safelight. (3) Add a ground wire to enlarger to help control static.
MODERN PHOTOGRAPHY May 1980 (v.44#5) pg. 72

Keeping time in the dark. A complete guide to darkroom timers looks at their functions, features, and foibles.
MODERN PHOTOGRAPHY Mar 1982 (v.46#3) pg. 102

Build a footswitch to turn your darkroom timer on or off.
MODERN PHOTOGRAPHY Sep 1982 (v.46#9) pg. 96

Tip: Use a cassette recorder as a talking timer for darkroom processing.
MODERN PHOTOGRAPHY Jan 1984 (v.48#1) pg. 67

How to build an audible dodging timer. A simple add-on converts any electronic timer to generate an audible "tick" every second.
PHOTOGRAPHIC Jul 1980 (v.9#3) pg. 79

Inexpensive darkroom timer that blinks allows you to time short exposures without an expensive control unit. Est. cost: $4.
PHOTOGRAPHIC Dec 1980 (v.9#8) pg. 93

Build a darkroom metronome. This electronic device beeps at one-second intervals. Est. cost: $13.
PHOTOGRAPHIC May 1987 (v.16#1) pg. 82

Darkroom metronome uses flashing light to aid in counting seconds.
POPULAR ELECTRONICS [1] Feb 1965 (v.22#2) pg. 84

Tonal darkroom timer or metronome.
POPULAR ELECTRONICS [1] Nov 1965 (v.23#5) pg. 95

Blinking darkroom timer. Neon lamp flashes once per second on this battery-powered unit.
POPULAR ELECTRONICS [1] Sep 1967 (v.27#3) pg. 87

Darkroom enlarger timer with a focus switch and a range of 5 to 60 seconds. Circuit uses a silicon-controlled switch.
POPULAR ELECTRONICS [1] Nov 1969 (v.31#5) pg. 52

One-second metronome timer produces an audible "click" and a flash of light every second. Useful for photo darkroom work.
POPULAR ELECTRONICS [1] Feb 1970 (v.32#2) pg. 58

Integrated circuit photo development timer is ideal for use with Polaroid camera. Provides an audible alarm at the end of either 15 seconds or 2 minutes. Est. cost: $15.
POPULAR ELECTRONICS [1] Oct 1973 (v.4#4) pg. 70

Build a digital darkroom timer to control an enlarger or other device. Timing interval can vary from 0 seconds to 9 minutes 59 seconds, or from 0 minutes to 9 hours 59 minutes. A 3 digit LED indicates elapsed time. Est. cost: $48.
POPULAR ELECTRONICS [1] Aug 1978 (v.14#2) pg. 47

Build a photo darkroom sink sentinel. It is a photo-lab timer, thermometer, and conductivity tester in one.
POPULAR ELECTRONICS [1] Feb 1980 (v.17#2) pg. 50
Added Info POPULAR ELECTRONICS [1] Jun 1980 (v.17#6) pg. 6

One-second timer circuit flashes an LED at one-second intervals. Ideal for timing photographic applications.
POPULAR ELECTRONICS [2] Mar 1989 (v.6#3) pg. 27

Electronic darkroom timer. Build an audible interval timer which measures either 15 or 30 seconds, depending on switch setting. Used to remind a darkroom worker to agitate film developing tank, time processing steps, etc.
POPULAR ELECTRONICS [2] Nov 1989 (v.6#11) pg. 33
Correction POPULAR ELECTRONICS [2] Feb 1990 (v.7#2) pg. 4

Exercise pacer circuit provides evenly spaced "clicks" for keeping pace while using an exercise machine. Also suitable for use as a metronome or audible darkroom timer.
POPULAR ELECTRONICS [2] Sep 1990 (v.7#9) pg. 22

Build a programmable precision darkroom timer that doubles as an enlarger timer and a visual development timer. Timer range is 1-to-999 seconds (in 1 second increments) or 0.1-99.9 seconds (in 0.1 second increments).
POPULAR ELECTRONICS [2] Aug 1992 (v.9#8) pg. 53

Thrifty darkroom timer.
POPULAR MECHANICS Jun 1964 (v.121#6) pg. 177

Timer counts seconds and turns off enlarger.
POPULAR MECHANICS Dec 1965 (v.124#6) pg. 150

Electronic darkroom timer has an illuminated dial. Times up to 30 seconds. Has a switch to bypass timer for focusing enlarger.
POPULAR MECHANICS Jun 1972 (v.137#6) pg. 122

How to add a beeper to a Gra-lab timer so that it will beep once a minute.
POPULAR MECHANICS Nov 1973 (v.140#5) pg. 84B

Tip: On-off switch added to a darkroom timer allows it to be used for both developing and enlarging.
POPULAR MECHANICS Mar 1979 (v.151#3) pg. 26

Tip: Add an adjustable magnetic stop to the face of a darkroom timer. Clock arm can be set by turning until you hit the stop.
POPULAR MECHANICS Jan 1981 (v.155#1) pg. 131

Darkroom timer is built into a plastic 35mm film can. A light emitting diode flashes at a rate you can control. Count the flashes to determine time interval. Useful for night photography or getting attention of children. Est. cost: $5.
POPULAR PHOTOGRAPHY May 1974 (v.74#5) pg. 98
Added Info POPULAR PHOTOGRAPHY Jul 1974 (v.75#1) pg. 116

Facts and features of darkroom timers currently available and tips on selecting one for your needs.
POPULAR PHOTOGRAPHY Aug 1976 (v.79#2) pg. 46

Schematic for an electronic timer well suited for flashing photo papers.
POPULAR PHOTOGRAPHY Feb 1979 (v.84#2) pg. 128

Variable timer produces an audible click. Adjustable from 4 clicks per second to 1 click every 2 seconds. Use as a darkroom timer or metronome.
POPULAR SCIENCE Mar 1967 (v.190#3) pg. 166

Build a digital timer for your darkroom. Part 1. Digital display can range from 0.1 seconds to 99 minutes and 99 seconds. Internal timing range can go up to 694 days. Features include a pause switch, focus switch, start-stop timer switch, an audio signal once per second (which can be turned off) and the ability to switch 150 watts. Est. cost: $90.
RADIO-ELECTRONICS Jul 1978 (v.49#7) pg. 33

Build a digital timer for your darkroom. Part 2.
RADIO-ELECTRONICS Aug 1978 (v.49#8) pg. 33
Correction RADIO-ELECTRONICS Dec 1978 (v.49#12) pg. 25

Universal darkroom timer can control an enlarger and also time film development. The timer may be constructed in three versions: 0-7 seconds and minutes, 0-10 seconds and minutes, or 0-15 seconds and minutes.
SCIENCE & ELECTRONICS [1] Oct-Nov 1969 (v.27#2) pg. 35