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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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CLOCKWORK -- ELECTRONIC sa COMPUTER CLOCKING & TIMING sa TIME-SIGNAL RADIO x DIGITAL CLOCK xx CLOCKWORK Add a power-failure sensor to any ac digital clock. After a power failure, the circuit will "beep" until you reset the clock. Adding an output interface to an electronic clock module to control external devices such as radios and lights. 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. Low-power clock circuit that has a frequency range from about 0.1 to 2Hz. Universal clock simultaneously displays sidereal time, standard (local) time and coordinated universal time (UCT) on an LCD screen. Est. cost: $15. Block diagram shows how to cascade demultiplexers to get 60 outputs (in the form of 60 LEDs used in an electronic clock face). Circuit design idea for driving AC clock motors with an H-bridge. 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. Two chip circuit that can be used to generate an accurate 50 Hz or 60 Hz clock signal using a standard microprocessor crystal. A scrolling LED clock displays the time in ticker-tape fashion. Est. cost: $49 (kit). Digital instruments you can build. Part 4. A 24-hour digital clock. Circuit to convert 60-Hz sine waves from power line into accurate digital pulses. Circuit requires no DC. 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. 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. Six-digit LED readout clock shows hour, minutes and seconds in 12-hour or 24-hour format. Powered by 117-volt AC line. 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. 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. 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. Circuit to generate a 60-Hz clock pulse. 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. CMOS TTL clock circuit. TTL timepiece. A digital clock project will teach you some of the principles of timing circuits, counter/divider circuits, etc. Selection and repair of "bargain table" electronic items. Tips on troubleshooting electronic calculators, radios, meters, etc. 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. 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. 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. 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. 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. Modify the Heathkit electronic digital clock model GC-1107 to also display seconds. Est. cost: $2. Schematic for adding an audible wake up alarm to a digital clock which uses a Radio Shack #227-1001 clock chip. 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. An analog-display digital clock. Combines appeal of a traditionalround dial with high-tech digital driving circuitry. Est. cost: $90 plus case. Digi-Vista, an electronic digital clock with 4-digit readout for minutes and hours. Est. cost: $85. Six-digit electronic clock indicates hours, minutes and seconds. Build a digital clock. Uses modern TTL chips to display either 12- or 24-hour time in hours, minutes and seconds. Est. cost: $40. Digital clock gives the readout in binary numbers. Use as an aid in learning the binary numbering system. 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. Build a digital clock-calender combination. Four-digit readout tells hour and minute or month and day. Est. cost: $50. How to add luxury features to electronic digital clocks. (1) Make your digital clock "fail-safe". (2) Add an alarm clock function. Circuit uses a 555 IC timer to produce a source of 60-Hz for timing digital clocks in boats, recreation vehicles, etc. Circuit to blank out the leading zero on the CT-7001 clock/calender chip. Adding a 10-minute "beeper" to a digital clock reminds ham operators to identify their station. 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). Circuit for a digital clock "beeper". Once triggered by the alarm enable signal, it will beep until a switch is turned off. 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. 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. 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. Schematic diagram for an electronic clock which uses inexpensive 7400 series TTL ICs along with type 555 timers. Est. cost: $5. A chart illustrates the characteristics of six different digital clock chips from National Semiconductor Company. 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. How to program an HP-25 for use as a digital clock and timer. Making digital electronic clocks immune to AC flicker. Circuit overcomes the problems caused by short power outages on AC (up to 1-second). Electronic thermometer and digital clock are each powered by batteries which are recharged by means of solar cells. Add a "tick-tock" sound to your digital clock with this circuit. Accurate timebase for digital electronic clocks maintains digital counting automatically if power is lost. LED pendulum for digital clocks. A V-shaped arrangement of LEDs give the illusion of a pendulum swinging back and forth. Clock pulse generator circuit uses the ICM7209 CMOS chip plus just three external components. Teach your digital clock to control appliances. A few simple additions turn a standard clock module into a versatile control center. 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). 24-hour digital clock project helps you to better understand principles of digital electronics. Est. cost: $90 (kit). Build the millennium clock. This electronic calendar will keep track of how many days until a certain event happens. A look at digital clock kits you can build. Inlcudes tips on resetting digital clocks. 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. 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. 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. Digital wall clock uses lighted LEDs at the hour and minute positions on a circular clock face to indicate the time. Est. cost: $48. 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. 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. Ten-function digital clock. Part 2. Build a biorhythm clock. Digital clock keeps track of your biorhythm curves. Est. cost: $30. 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. Build an AM/FM frequency display. Part 2. 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. Build Digi-Toll. Part 2. How to modify an electronic clock so it counts any time period you wish, even two years. Electronic digital clock flashes hours and minutes sequentially on a single 7-segment display nearly 5" high. Estimated cost: $50. Build this combination digital clock and digital thermometer. Est. cost: $50. Circuit for a battery backup for digital clocks will keep clock running if AC power fails. Tips on adding a BCD (binary coded decimal) readout to a digital clock. Circuit to generate a 60-Hz signal for use in battery-operated clocks. Designing with digital IC's. Part 8. One-shots (monostable multivibrators) and clocks. Circuit for an inexpensive crystal timebase to generate 1-second and 0.1-second pulses, as well as a manual "reset" pulse. How to design oscillator circuits. Part 6. Digital clock circuits using TTL IC's. TSM 201 clock module kit displays time on four 8-mm 7-segment LEDs. Power by AC or DC. Est. cost: $27. 60-Hz timebase. Motorola's MC14566B CMOS IC timebase generator that is both accurate and flexible. Operation and typical circuits viewed. 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). 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. 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. An easy, inexpensive electronic clock displays both sidereal and Universal time. Computer routine that calculates whether daylight saving or standard time is in effect on any given month and day. Written in BASIC. | |||||||||
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