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Clock Circuits
Clocks: #-A
B-C D-G
H-O P-S
T-Z
Last Updated on:
Wednesday, June 02, 2021 04:22 AM |
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| Circuits Designed by Dave Johnson, P.E. : |
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Darkroom Camera Shutter Timer - This circuit was designed to control a film exposure shutter for a darkroom. It has 8 time
steps ranging from 0. 35 seconds to 4 seconds. It is activated by a foot switch and draws power from an
external 12-volt DC supply . . . [Circuit by David Johnson P.E., 06/11/00]
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Digital Counter Using
Pedometer - There are many occasions when you may
want to count something electronically. Perhaps it is car traffic on a street or items moving down an
assembly line. It might be the number of times a machine is activated or maybe you want to count the number
of . . . [Hobby Circuit designed by David Johnson P.E., 08/17/08]
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students &
inventors:
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Darkroom Camera Shutter Timer - This circuit was designed to control a film exposure shutter for a darkroom. It has 8 time
steps ranging from 0. 35 seconds to 4 seconds. It is activated by a foot switch and draws power from an
external 12-volt DC supply . . . [Circuit by David Johnson P.E., 06/11/00]
DC Power Wire also
Carries Clock or Data - 03/13/98 EDN Design Idea
(File has several circuits, scroll to this one) High-side current-sense amplifier, IC1, offers a simple
method of combining low-speed clocks or other signals with dc power in cables between subsystems. . . [by
Mike Hardwick, Decade Engineering, Turner, OR]
Dekatron-device used for dividing by 10
during the valve era - . . . [Written by Hans
Summers] |
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Delay line has wide duty-cycle range - 06/27/02 EDN Design Idea Today's digital delay lines can process pulses no shorter than
their delay times, and that restriction confines the devices to applications in which the duty cycle remains
near 50%. A limited range of available delays (2 to 100 nsec. . . [by John Guy, Maxim Integrated Products,
Sunnyvale, CA]
Delay Line implements Clock Doubler - 07/18/96 EDN Design Idea Timing delays are undesirable in most digital circuits.
However, in some cases, delays can be useful—to deal with a µP-speed-compatibility issue, for example. The
circuit in Figure 1a uses a silicon T/4 delay line and an XOR gate to implement a simple clo. . . [by Y Li,
SAE magnetics (HK) Ltd, Guang Dong Province, China] |
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Digital clock based on 74
series logic - With pleasure the lot of friends of
digital clocks that use discernible components, will see this circuit. It's a clock, with 12hour clue, little
simpler in the manufacture from the SamClock. It�s a designing that became from the friend George
Kordogiannis in 1990, which was modified and corrected in enough points by my, until it reach in the current
form. Most completed that uses is TTL, apart from the IC9 until IC13, that is CMOS, that they have the
faculty to drive display Common Cathode. . . [by Sam Gordon]
Digital clock that receives and displays the time
from the Rugby MSF radio transmission (PIC16F877) - A
digital clock which receives and displays the time from the MSF radio transmission, broadcast from Anthorn,
Cumbria (54°55'N, 3°17'W). . . . [© Chris Johnson]
Digital Clock with Timer & Solar Panel
Regulator - This is a combination digital clock timer
and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output
is used to control a 12 volt load for a 32. . . . [Bill Bowden]
Digital Counter Using
Pedometer - There are many occasions when you may
want to count something electronically. Perhaps it is car traffic on a street or items moving down an
assembly line. It might be the number of times a machine is activated or maybe you want to count the number
of . . . [Hobby Circuit designed by David Johnson P.E., 08/17/08]
Digital Stopwatch - times up to an hour in tenths of a second -. . . [by P. Townshend - EduTek Ltd]
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