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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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PHOTOGRAPHIC DARKROOM TIMER x PHOTOGRAPHIC ENLARGER TIMER xx PHOTOGRAPHIC DARKROOM xx TIMER Tip on using a small tape recorder to time film processing and listen to music at the same time. A comparison of sixteen photogaphic darkroom timers that are commercially available. Annual timer buying guide. Part 1. Annual timer buying guide. Part 2. Build a digital photographic processing timer. Counts up to 9 minutes, 59 seconds. Displays time on a digital clock. Est. cost: $30-$40. How to choose a darkroom timer. (Buying guide). 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 timer buying guide. Tip: Use a pre-recorded tape to time darkroom operations. Tip: Use coins to help keep track of the time in the darkroom. Tip: Use a prerecorded cassette to time various darkroom tasks. 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). Solid-state darkroom timer goes from 0.1 to 99 seconds. 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. Photographic print timer features illuminated digit-set dials, automatic reset and controls the safelight. Times from 1 to 119 seconds. 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. 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. 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. 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. Circuit for a darkroom timer which radiates a light pulse from an LED at one-second intervals. Darkroom timer circuit will call your attention to the timer by sounding a tone before the clock times out. 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. 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. 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. Tip: Simple modification allows your darkroom timer to be mounted on the wall, yet moved from place to place as needed. 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. Keeping time in the dark. A complete guide to darkroom timers looks at their functions, features, and foibles. Build a footswitch to turn your darkroom timer on or off. Tip: Use a cassette recorder as a talking timer for darkroom processing. How to build an audible dodging timer. A simple add-on converts any electronic timer to generate an audible "tick" every second. Inexpensive darkroom timer that blinks allows you to time short exposures without an expensive control unit. Est. cost: $4. Build a darkroom metronome. This electronic device beeps at one-second intervals. Est. cost: $13. Darkroom metronome uses flashing light to aid in counting seconds. Tonal darkroom timer or metronome. Blinking darkroom timer. Neon lamp flashes once per second on this battery-powered unit. Darkroom enlarger timer with a focus switch and a range of 5 to 60 seconds. Circuit uses a silicon-controlled switch. One-second metronome timer produces an audible "click" and a flash of light every second. Useful for photo darkroom work. 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. 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. Build a photo darkroom sink sentinel. It is a photo-lab timer, thermometer, and conductivity tester in one. One-second timer circuit flashes an LED at one-second intervals. Ideal for timing photographic applications. 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. 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. 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). Thrifty darkroom timer. Timer counts seconds and turns off enlarger. Electronic darkroom timer has an illuminated dial. Times up to 30 seconds. Has a switch to bypass timer for focusing enlarger. How to add a beeper to a Gra-lab timer so that it will beep once a minute. Tip: On-off switch added to a darkroom timer allows it to be used for both developing and enlarging. 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. 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. Facts and features of darkroom timers currently available and tips on selecting one for your needs. Schematic for an electronic timer well suited for flashing photo papers. 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. 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. Build a digital timer for your darkroom. Part 2. 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. | |||||||||
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