Clock Circuits
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A Digital Clock can be made easily by using PIC Microcontroller, DS1307 and a 16G—2 LCD. I have already posted about Interfacing DS1307 RTC with PIC Microcontroller. The DS1307 RTC can work either in 24-hour mode or 12-hour mode with AM/PM indicator. It.... -
This circuit allows you to superimpose a title and/or the time and sate on an incoming video signal - very useful when editing video tapes. It`s also a good introduction to video signals and processing. The text that follows is from David`s article: With the.... -
In the circuit below, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is.... -
You can switch on a load such as Water pump automatically at the required time through this Clock Controlled Relay or also known as Time Delay Relay. It uses an ordinary clock to trigger the circuit to switch on the load .. -
12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5 minute intervals within the hour. 4 additional LEDs are used to indicate 1 to 4 minutes of time.. -
a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5 minute.... -
The clock shows time in 5 minute intervals. The hour and minute can be set. There is no alarm or any AM/PM indicator. For the clock face I used a 2 pieces of lenolium glued together to increase thickness. (A couple of floor tiles would work as well. ) The.... -
A clock using numeric neon lamps, also known as nixies. These display devices were common around the sixties and seventies and their use fell off after the invention of LED displays. Nowadays nixies have become valuable oldies and are hard to get even tough.... -
can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5 minute intervals within the hour. 4 additional LEDs are used to indicate 1 to 4 minutes of time.. -
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5.... -
In the circuit, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is comprised of.... -
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 minute time interval each day. Start time is set using 9 dip.... -
The MCU is ATMEL 89C4051 CMOS Microcontroller having 4kB code memory, 128 bytes On-chip RAM and 8-bit Port1 and Port3. The A/D chip is HARRIS CA3162, 3-digit DVM. The A/D converter employs dual-slope integrator providing 10Hz sampling rate. Digital output.... -
The schematic diagram (see picture) and electronic assembly are fairly straightforward since most of the magic happens in the microcontroller code.... -
I designed and built this Ring Counter Clock in 1970. The base is a 12" diameter/2" thick block of walnut from a hollowed-out gun stock blank. The back side of the base has been hollowed out to hold the circuit board. I chucked it up in a large lath and.... -
The wiring diagram for the clock and radio screen illumination for a 1999 mercury sable with a 3. 0L vin U. I have searched for hours on alldata and MichellOnDemand and have found absolutely nothing. Please help! I don`t know if it matters, but the vehicle.... -
Port 1 of the controller (AT89C4051) is used as the data lines for the LCD (starting from pin 7- pin14 of LCD). here i am using a 16 x 2 lines LCD display. In the first line, I`ll display "DAY" and "DATE", in the second line, i am displaying "TIME" with.... -
Clocks have been mentioned in the preceding section with regard to their action with FFs. You will recall that this circuit is a timing signal generated by the equipment to control operations. This control feature is demonstrated in both the D and J-K FFs..... -
Using this design, you can construct an electromagnetically impulsed pendulum clock with a 1-second beat. On the prototype, the pendulum rod is 115cm long with a bob adjusted to make it beat every second. It is suspended on a short piece of mainspring from a.... -
One of the author`s physics projects required an accurate 1-Hz (seconds) clock signal. Unfortunately, precision 10-MHz quartz crystals are expensive, while another problem was found in the inability of most common or garden 40xx CMOS logic chips to work at.... -
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful.... -
The term VCXO stands for Voltage Control Crystal Oscillator. The frequency of such an oscillator can be adjusted by a small amount through changing the control voltage. VCXO CLK generators have been used in various applications, such as digital T.... -
Before Light-Emitting Diodes (LEDs) and Liquid Crystal Displays (LCDs) the electronic industry used cold-cathode tubes for displaying numbers, symbols and even characters. Even though they are called "tubes" they differ from "radio tubes" by having no heater.... -
Many electronic projects call for a timebase generator, accurate to a second or so. One way of producing this is with a microcontroller, quartz crystal and some software. But a far cheaper and simpler approach is to recycle an old analogue quartz clock..... -
This type of infrared proximity circuit is widely used as an electric switch where physical contact is not desired for hygiene purpose. For example, we commonly see use of infrared proximity sensors on public drinking fountains and in public washrooms. The.... -
A mechanism by which a normal pot could be used as a digitized pot since I need each pot`s setting to be converted to a number between 0 and 15. I use that information to determine the duration for each step. I accomplished this by designing an analog to.... -
The clock is constructed on two boards; one carries the HT generator and the processor logic, the other the tubes. Thisallows a slightly more compact design that the previous effort, but didn`t save as much real estate as I`d hoped. The tubes are mounted on.... -
The nixie tube clock consists of a high voltage power supply, seven rings counters and an Atmel AVR processor. The power supply is shown in schematic Schematic 1. It takes 12 volts AC and converts it to DC which drives the Maxim 1771 switching power supply.... -
This is the circuit diagram for each individual channel; Note: I replaced the 0. 1 uF timing capacitor with a 100 pF capacitor for better operation, with the 0. 1 uF capacitor in place, the fans would growl when turned down to slower speeds and the 100 pF.... -
All of the parts in this list are generally available through Radioshack for less than $20. I highly recommend using breadboard! You`re bound to make mistakes your first time and soldering it will only make your fail worse (double fail ). I`ve compiled this....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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