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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.


Add a power-failure sensor to any ac digital clock. After a power failure, the circuit will "beep" until you reset the clock.
COMPUTERS & ELECTRONICS Sep 1983 (v.21#9) pg. 79

Adding an output interface to an electronic clock module to control external devices such as radios and lights.
COMPUTERS & ELECTRONICS Oct 1983 (v.21#10) pg. 104

Motorola 68705 microcontroller. (1) How to build a single-IC microprocessor system using the Motorola MC68705P3 microcomputer on a chip. (2) Build a programmer for burning software into the 68705's internal EPROM. (3) Digital alarm clock project built around the 68705 IC.

Build the hyper clock. Uses a custom-programmed microcontroller to display the time in eight modes, simulate a sweep second hand, graphically display the level of ocean tides, an hourly chime/alarm, etc. Est. cost: $75 (kit).

Hour Tune. Combine an LCD watch with this circuit and you'll be serenaded by a different tune at the start of each hour.

Build a binary clock. One or more of 24 bi-color LEDs change from green-to-red or red-to-green every second. Telling the time requires an understanding of the binary numbering system. Est. cost: $60 (kit).

24-hour digital clock displays hours, minutes and seconds. An alarm feature will sound for exactly one minute and can trigger an external device via a switch. Also features an electronic "pendulum" display and a "tick-tock" noise generator. Est. cost: $90 (kit).

Digital alarm clock based on the Motorola HMOS 68705P microcontroller.
ELECTRONICS NOW Feb 1994 (v.65#2) pg. 59

Low-power clock circuit that has a frequency range from about 0.1 to 2Hz.
ELECTRONICS NOW Mar 1995 (v.66#3) pg. 8

Universal clock simultaneously displays sidereal time, standard (local) time and coordinated universal time (UCT) on an LCD screen. Est. cost: $15.
ELECTRONICS NOW Jun 1995 (v.66#6) pg. 37

Block diagram shows how to cascade demultiplexers to get 60 outputs (in the form of 60 LEDs used in an electronic clock face).
ELECTRONICS NOW Nov 1995 (v.66#11) pg. 8

Circuit design idea for driving AC clock motors with an H-bridge.
ELECTRONICS NOW Mar 1996 (v.67#3) pg. 8

Circuit built around an MM5369 to derive a 60-Hz signal from a common 3.58-MHz TV crystal is used to run a digital clock chip.
ELECTRONICS NOW Jan 1998 (v.69#1) pg. 12

Two chip circuit that can be used to generate an accurate 50 Hz or 60 Hz clock signal using a standard microprocessor crystal.
ELECTRONICS NOW Nov 1998 (v.69#11) pg. 7

A scrolling LED clock displays the time in ticker-tape fashion. Est. cost: $49 (kit).
ELECTRONICS NOW Dec 1999 (v.70#12) pg. 45

Digital instruments you can build. Part 4. A 24-hour digital clock.
ELECTRONICS WORLD Nov 1970 (v.84#5) pg. 41

Circuit to convert 60-Hz sine waves from power line into accurate digital pulses. Circuit requires no DC.
ELECTRONICS WORLD Aug 1971 (v.86#2) pg. 69

Electronic clock uses a popular clock-on-a-chip integrated circuit and a fluorescent-anode type display tube that can be driven directly by an IC. Clock operates in both 12 and 24 hour modes and dispalys the date. Standby battery keeps time during power failure.
ELEMENTARY ELECTRONICS Nov-Dec 1973 (v.13#6) pg. 45

Digital readout clock features 6-digits. It is a calander, a 24-hour alarm clock, has a 10-minute snooze alarm, can be operated in 12 or 24 hour mode, has battery backup, remembers days of the month, and uses no printed circuit board. Est. cost: Over $30.
ELEMENTARY ELECTRONICS Mar-Apr 1975 (v.15#2) pg. 39

Six-digit LED readout clock shows hour, minutes and seconds in 12-hour or 24-hour format. Powered by 117-volt AC line.
ELEMENTARY ELECTRONICS Jul-Aug 1976 (v.16#4) pg. 45

Build a digital clock around the National Semiconductor Corp's complete clock-on-a-chip. It can include an alarm, snooze-cycle, seconds display, power failure alert, hold feature to speed up setting the time, etc.
ELEMENTARY ELECTRONICS Mar-Apr 1977 (v.17#2) pg. 59

24-hour BCD (binary coded decimal) clock. An LED readout in BCD code is both novel and helps teach that coding scheme. Est. cost: $25.
ELEMENTARY ELECTRONICS Nov-Dec 1979 (v.19#6) pg. 33

Auto-temp. Low-cost digital clock and thermometer will automatically display the time for six seconds. It then displays indoor temperature for 3 seconds followed by outdoor temperature.
HANDS-ON ELECTRONICS Summer 1984 (v.2#1) pg. 84

Circuit to generate a 60-Hz clock pulse.
HANDS-ON ELECTRONICS Nov-Dec 1985 (v.2#6) pg. 4

Electronic "before and after" clock. Digital clock displays the time in the manner in which it is spoken. Example: "20 before 10", "10 after 5", "9 O'clock", "12:30", ... etc.
HANDS-ON ELECTRONICS Jan-Feb 1986 (v.3#1) pg. 45

CMOS TTL clock circuit.
HANDS-ON ELECTRONICS Mar-Apr 1986 (v.3#2) pg. 4

TTL timepiece. A digital clock project will teach you some of the principles of timing circuits, counter/divider circuits, etc.
HANDS-ON ELECTRONICS May-Jun 1986 (v.3#3) pg. 45
Correction HANDS-ON ELECTRONICS Mar 1987 (v.4#3) pg. 4

Selection and repair of "bargain table" electronic items. Tips on troubleshooting electronic calculators, radios, meters, etc.
HANDS-ON ELECTRONICS Jan 1987 (v.4#1) pg. 96

Perpetual calendar. Add the "Day-Lites" perpetual-calendar circuit to any LED clock and keep track of the days of week as well as the time.
HANDS-ON ELECTRONICS Jul 1988 (v.5#7) pg. 28
Correction HANDS-ON ELECTRONICS Sep 1988 (v.5#9) pg. 8
Added Info HANDS-ON ELECTRONICS Dec 1988 (v.5#12) pg. 5

Electronic clock and thermometer is built around the National Semiconductor MA 1026M module. Up to 6 temperature probes may be attached. Reads-out in either Fahrenheit or Celsius.
INDUSTRIAL EDUCATION Jan 1983 (v.72#1) pg. 30

Build an analog fast-time clock. Just turn a dial to get the speed you want, even 1:1. Used in model railroad setups to simulate the passage of time at a faster (scale) rate.
MODEL RAILROADER Aug 1997 (v.64#8) pg. 68

How to interface the Heathkit Westminister chimes kit to just about any digital clock which uses one of the 12 most popular clock integrated circuits.
MODERN ELECTRONICS [1] May 1978 (v.1#3) pg. 55

Digital readout electronic clock features red, green and yellow number readouts. Six digit display, can have 12 or 24 hour display, powered by 50 or 60 Hz AC using a 117-volt or 220-volt transformer, or with a 12-volt DC source using a simple crystal time base. Est. cost: $25-$30.
MODERN ELECTRONICS [1] May 1978 (v.1#3) pg. 64

Modify the Heathkit electronic digital clock model GC-1107 to also display seconds. Est. cost: $2.
MODERN ELECTRONICS [1] Jun 1978 (v.1#4) pg. 65

Schematic for adding an audible wake up alarm to a digital clock which uses a Radio Shack #227-1001 clock chip.
MODERN ELECTRONICS [1] Oct 1978 (v.1#8) pg. 7

Jumbo LED digital clock. Read it from 100 feet away, set it for a 12- or 24-hour format, 4 or 6 digits, use on 50- or 60-Hz ac lines with battery backup. Est. cost: $60.
MODERN ELECTRONICS [2] Apr 1987 (v.4#4) pg. 34

An analog-display digital clock. Combines appeal of a traditionalround dial with high-tech digital driving circuitry. Est. cost: $90 plus case.
MODERN ELECTRONICS [2] May 1989 (v.6#5) pg. 54

Digi-Vista, an electronic digital clock with 4-digit readout for minutes and hours. Est. cost: $85.
POPULAR ELECTRONICS [1] Dec 1970 (v.33#6) pg. 25

Six-digit electronic clock indicates hours, minutes and seconds.
POPULAR ELECTRONICS [1] Jan 1971 (v.34#1) pg. 71
Added Info POPULAR ELECTRONICS [1] May 1971 (v.34#5) pg. 8

Build a digital clock. Uses modern TTL chips to display either 12- or 24-hour time in hours, minutes and seconds. Est. cost: $40.
POPULAR ELECTRONICS [1] Mar 1973 (v.3#3) pg. 51

Digital clock gives the readout in binary numbers. Use as an aid in learning the binary numbering system.
POPULAR ELECTRONICS [1] May 1973 (v.3#5) pg. 31
Added Info POPULAR ELECTRONICS [1] Sep 1973 (v.4#3) pg. 9

Build the Monodigichron, a unique electronic clock that uses only one-digit readout and displays hours and minutes in sequential form. Flashes time about 15 times per minute. Est. cost: $39.
POPULAR ELECTRONICS [1] Sep 1973 (v.4#3) pg. 35

Build a digital clock-calender combination. Four-digit readout tells hour and minute or month and day. Est. cost: $50.
POPULAR ELECTRONICS [1] Nov 1973 (v.4#5) pg. 29

How to add luxury features to electronic digital clocks. (1) Make your digital clock "fail-safe". (2) Add an alarm clock function.
POPULAR ELECTRONICS [1] Dec 1973 (v.4#6) pg. 59
Correction POPULAR ELECTRONICS [1] Feb 1974 (v.5#2) pg. 8

Circuit uses a 555 IC timer to produce a source of 60-Hz for timing digital clocks in boats, recreation vehicles, etc.
POPULAR ELECTRONICS [1] Jul 1974 (v.6#1) pg. 91

Circuit to blank out the leading zero on the CT-7001 clock/calender chip.
POPULAR ELECTRONICS [1] Aug 1974 (v.6#2) pg. 7

Adding a 10-minute "beeper" to a digital clock reminds ham operators to identify their station.
POPULAR ELECTRONICS [1] Aug 1974 (v.6#2) pg. 48

Update your digital clocks with add-ons. Circuits for: (1) An hour chimer, (2) An alarm for heavy sleepers and (3) a tick-tock sound generator (sounds like a grandfather clock).
POPULAR ELECTRONICS [1] Feb 1975 (v.7#2) pg. 50

Circuit for a digital clock "beeper". Once triggered by the alarm enable signal, it will beep until a switch is turned off.
POPULAR ELECTRONICS [1] May 1975 (v.7#5) pg. 88

Schematic of a digital electronic clock with an unusual readout system. Individual lamps represent 1-minute, 5-minute and 1-hour intervals. The total of the lamps lit is the current time.
POPULAR ELECTRONICS [1] Apr 1976 (v.9#4) pg. 96

How to add back the missing horizontal top and bottom "tails" line which some clock-on-a-chip ICs do not display on the digits 6 and 9.
POPULAR ELECTRONICS [1] Jun 1976 (v.9#6) pg. 100
Correction POPULAR ELECTRONICS [1] Aug 1976 (v.10#2) pg. 6

Electronic clock plays the famous Big Ben Westminister chime tune every quarter hour and chimes the time every hour, just like the original. Uses 19 integrated circuits.
POPULAR ELECTRONICS [1] Nov 1976 (v.10#5) pg. 57
Correction POPULAR ELECTRONICS [1] Jun 1977 (v.11#6) pg. 6
Added Info POPULAR ELECTRONICS [1] Aug 1977 (v.12#2) pg. 6
Correction POPULAR ELECTRONICS [1] Oct 1977 (v.12#4) pg. 12

Schematic diagram for an electronic clock which uses inexpensive 7400 series TTL ICs along with type 555 timers. Est. cost: $5.
POPULAR ELECTRONICS [1] Dec 1976 (v.10#6) pg. 93

A chart illustrates the characteristics of six different digital clock chips from National Semiconductor Company.
POPULAR ELECTRONICS [1] Jan 1977 (v.11#1) pg. 70

Portable 60-Hz "clock" oscillator. Crystal-controlled time base for field use. Allows digital clocks and timers to be used in cars, boats or out-of-doors.
POPULAR ELECTRONICS [1] Jul 1977 (v.12#1) pg. 70

How to program an HP-25 for use as a digital clock and timer.
POPULAR ELECTRONICS [1] Aug 1977 (v.12#2) pg. 57
Added Info POPULAR ELECTRONICS [1] Mar 1978 (v.13#3) pg. 10

Making digital electronic clocks immune to AC flicker. Circuit overcomes the problems caused by short power outages on AC (up to 1-second).
POPULAR ELECTRONICS [1] Nov 1977 (v.12#5) pg. 58

Electronic thermometer and digital clock are each powered by batteries which are recharged by means of solar cells.
POPULAR ELECTRONICS [1] Dec 1977 (v.12#6) pg. 41

Add a "tick-tock" sound to your digital clock with this circuit.
POPULAR ELECTRONICS [1] Nov 1978 (v.14#5) pg. 81

Accurate timebase for digital electronic clocks maintains digital counting automatically if power is lost.
POPULAR ELECTRONICS [1] Oct 1979 (v.16#4) pg. 76

LED pendulum for digital clocks. A V-shaped arrangement of LEDs give the illusion of a pendulum swinging back and forth.
POPULAR ELECTRONICS [1] Jul 1980 (v.18#1) pg. 30
Correction POPULAR ELECTRONICS [1] Nov 1980 (v.18#5) pg. 9

Clock pulse generator circuit uses the ICM7209 CMOS chip plus just three external components.
POPULAR ELECTRONICS [1] Sep 1981 (v.19#9) pg. 104

Teach your digital clock to control appliances. A few simple additions turn a standard clock module into a versatile control center.
POPULAR ELECTRONICS [1] May 1982 (v.20#5) pg. 73

Build a binary clock. One or more of a field of 24 LEDs (arranged in six vertical columns and 4 horizontal rows) changes from green to red, or red to green each second. Est cost: $60 (kit).
POPULAR ELECTRONICS [2] Jan 1991 (v.8#1) pg. 31

24-hour digital clock project helps you to better understand principles of digital electronics. Est. cost: $90 (kit).
POPULAR ELECTRONICS [2] Jul 1994 (v.11#7) pg. 61
Correction POPULAR ELECTRONICS [2] Sep 1994 (v.11#9) pg. 3

Build the millennium clock. This electronic calendar will keep track of how many days until a certain event happens.
POPULAR ELECTRONICS [2] Nov 1998 (v.15#11) pg. 31
Correction POPULAR ELECTRONICS [2] Jan 1999 (v.16#1) pg. 4

A look at digital clock kits you can build. Inlcudes tips on resetting digital clocks.
POPULAR MECHANICS Dec 1973 (v.140#6) pg. 127

Time cube, a unique digital clock you can make. Push down on top to display lighted numerals, or have automatic display every 10 seconds, or count seconds from 00 to 59 for use as a timer. Est. cost: $70.
POPULAR SCIENCE Jun 1972 (v.200#6) pg. 99

Electronic digital clock/calender gives you the time, in hours and minutes, and the date, in month and day, every 10 seconds. Built-in battery backup keeps clock running during a power failure.
POPULAR SCIENCE Nov 1973 (v.203#5) pg. 120

Easy-to-build digital clocks. Adding switches and a transformer to preassembled clock modules results in a digital clock. Est. cost: $28. A review of various modules currently available.
RADIO-ELECTRONICS Mar 1977 (v.48#3) pg. 54

Digital wall clock uses lighted LEDs at the hour and minute positions on a circular clock face to indicate the time. Est. cost: $48.
RADIO-ELECTRONICS Jun 1977 (v.48#6) pg. 35

Build this digital on-screen TV clock. Digital clock displays either 4 or 6 digits of time on the screen of your TV set in either 12- or 24-hour format. Est. cost: $30.
RADIO-ELECTRONICS Jul 1977 (v.48#7) pg. 35

Ten-function digital clock. Part 1. Simultaneous readout of time, date, alarm and countdown timer. Timer has three modes of operation to turn on or off appliances and the time can be 12- or 24-hour format. Est. cost: $109.
RADIO-ELECTRONICS Aug 1977 (v.48#8) pg. 36

Ten-function digital clock. Part 2.
RADIO-ELECTRONICS Sep 1977 (v.48#9) pg. 40
Correction RADIO-ELECTRONICS Nov 1977 (v.48#11) pg. 16

Build a biorhythm clock. Digital clock keeps track of your biorhythm curves. Est. cost: $30.
RADIO-ELECTRONICS Nov 1977 (v.48#11) pg. 33
Correction RADIO-ELECTRONICS Jan 1978 (v.49#1) pg. 18
Correction RADIO-ELECTRONICS Feb 1978 (v.49#2) pg. 16

Build an AM/FM frequency display. Part 1. Gives you a digital readout of the frequency on which your receiver is set. It also displays the time of day. Unit is crystal controlled for accuracy. Est. cost: $45.
RADIO-ELECTRONICS Jan 1978 (v.49#1) pg. 21
Correction RADIO-ELECTRONICS Jul 1978 (v.49#7) pg. 22

Build an AM/FM frequency display. Part 2.
RADIO-ELECTRONICS Apr 1978 (v.49#4) pg. 46

Build Digi-Toll. Part 1. A digital timekeeping accessory that displays the time of day and the elapsed time spent on long distance calls. The unit is not attached to phone. Using it to time your calls can result in savings on toll charges. Est. cost: $50.
RADIO-ELECTRONICS Jun 1978 (v.49#6) pg. 69

Build Digi-Toll. Part 2.
RADIO-ELECTRONICS Jul 1978 (v.49#7) pg. 37

How to modify an electronic clock so it counts any time period you wish, even two years.
RADIO-ELECTRONICS Jul 1979 (v.50#7) pg. 66

Electronic digital clock flashes hours and minutes sequentially on a single 7-segment display nearly 5" high. Estimated cost: $50.
RADIO-ELECTRONICS Feb 1980 (v.51#2) pg. 61
Correction RADIO-ELECTRONICS Jun 1980 (v.51#6) pg. 22

Build this combination digital clock and digital thermometer. Est. cost: $50.
RADIO-ELECTRONICS Feb 1982 (v.53#2) pg. 57
Added Info RADIO-ELECTRONICS Sep 1982 (v.53#9) pg. 23

Circuit for a battery backup for digital clocks will keep clock running if AC power fails.
RADIO-ELECTRONICS Jan 1983 (v.54#1) pg. 85

Tips on adding a BCD (binary coded decimal) readout to a digital clock.
RADIO-ELECTRONICS Aug 1983 (v.54#8) pg. 100

Circuit to generate a 60-Hz signal for use in battery-operated clocks.
RADIO-ELECTRONICS Jun 1985 (v.56#6) pg. 72

Designing with digital IC's. Part 8. One-shots (monostable multivibrators) and clocks.
RADIO-ELECTRONICS Jan 1986 (v.57#1) pg. 71

Circuit for an inexpensive crystal timebase to generate 1-second and 0.1-second pulses, as well as a manual "reset" pulse.
RADIO-ELECTRONICS Feb 1986 (v.57#2) pg. 46

How to design oscillator circuits. Part 6. Digital clock circuits using TTL IC's.
RADIO-ELECTRONICS Dec 1986 (v.57#12) pg. 71

TSM 201 clock module kit displays time on four 8-mm 7-segment LEDs. Power by AC or DC. Est. cost: $27.
RADIO-ELECTRONICS Nov 1987 (v.58#11) pg. 122, 127

60-Hz timebase. Motorola's MC14566B CMOS IC timebase generator that is both accurate and flexible. Operation and typical circuits viewed.
RADIO-ELECTRONICS Jan 1988 (v.59#1) pg. 56

Hyper clock. Electronic (digital) clock can display time in eight eye-catching modes. Features a simulated sweep second hand, level of ocean tides, fading display mode, hourly chime/alarm, battery backup, date display, etc. Est. cost: $70 (kit).
RADIO-ELECTRONICS Feb 1992 (v.63#2) pg. 33

Circuit for a solid state clock which can operate a switch automatically at regular and predetermined intervals, make a periodic sound, register the passage of time in discrete units, etc.
SCIENTIFIC AMERICAN Feb 1968 (v.218#2) pg. 126

How to make a quartz-crystal oscillator for a pendulum clock that will give it an accuracy of one second per year. Includes instructions, circuitry of oscillator, power supply and digital counting circuit, details of solenoid assembly and layout of pins and circuit-division scheme.
SCIENTIFIC AMERICAN Sep 1974 (v.231#3) pg. 192
Correction SCIENTIFIC AMERICAN Nov 1974 (v.231#5) pg. 134

An easy, inexpensive electronic clock displays both sidereal and Universal time.
SKY & TELESCOPE Nov 1983 (v.66#5) pg. 453

Computer routine that calculates whether daylight saving or standard time is in effect on any given month and day. Written in BASIC.
SKY & TELESCOPE Jun 1987 (v.73#6) pg. 647