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Clock Circuits

28 LED Clock Timer 72 LED Clock: programmable clock Timer circuit that uses individual LEDs to indicate hours and minutes

4 Bit Binary Clock:

72 LED Clock:

AT89C2051 Digital Thermometer & Clock:

Big LED Clock:

Car Clock: CaClo was designed and built to be used in an automobile. It uses pure discrete logic ICs (4000 series) and a4-digit LCD display with backlight, plus a few SMD ICs for the LCD driver.

Cheap 40KHz Clock:

Circuit allows high speed clock multiplication: 05/02/2002  EDN - Design Ideas / In theory, synchronous clock multiplication is an easy task. A simple PLL with two digital dividers�one inserted just after the VCO (voltage-controlled oscillator) and the second one placed directly at the input of the phase detector�may do the job. The flexibility of such a configuration allows for clock multiplication by any rational number

Circuit Conditions Variable Duty Cycle Clock: 01/05/95 EDN-Design Ideas

Clock Divider: 02/17/97 EDN-Design Ideas

Clock Doubler for CMOS Logic:

Clock Generator: Use4093 oscillator

Clock Recovery PLL Fits Into Single PLD: 11/23/95 EDN-Design Ideas

Delay line has wide duty cycle range: 06/27/2002  EDN - Design Ideas / 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 per tap) further limits their use. Longer delay is available with one-shot multivibrators of standard digital-logic families, but those devices do not retain duty-c....

Delay Line implements Clock Doubler: 12/19/96 EDN-Design Ideas

Dynamic Clock Provides for Zero Wait States: 07/18/96 EDN-Design Ideas

Edge Detector Runs off of Single Supply: 03/27/97 EDN-Design Ideas

Mains Clock Controller using AT89C2051 1:

Mains Clock Controller using AT89C2051 2: 12/04/97 EDN-Design Ideas

MM58174Real Time Clock in a Battery Backed Up: Design Provides Reliable Clock and Calendar Functions :  National Semiconductor Application Notes,04-Nov-1995

More Accurate PC / AT Clock: Nixie Tube Clock

Nixie Tube Clock:

PIC Tock Video Clock 1:

PIC Tock Video Clock 2:

Programmable Clock Oscillator: PIC-Tock video clock using a PIC16C61

Programmable Clock Oscillator: voltage controller oscillator that was designed as a wide range oscillator to generate clock pulses for a stepper motor drive system, frequency could be varied over1,000,000:1

Propeller Clock: a few light emitting diodes spin, precisely controlled by a PIC microprocessor, giving the illusion of a larger array.

Simple FSK Modulator:

Single Gate Synchronizes Clock: 10/27/94 EDN-Design Ideas

Speaking Clock using PIC & ISD Device: SpeClo was designed and built to be used by the blind. Its purpose is to provide a relatively easy way for ascertaining the Time of day by whistling, and can be configured to speak English or German!

Sun Up Alarm: The Sun - Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can also be used to detect a light beam, headlights etc. The circuit works as follows. The phototransistor is very sensitive to light. (Any phototransistor will work fine) The sun shining on this device will provide a high to one of the NAND gates. This will cause another NAND gate to oscillate which will drive another gate to output a100hz tone. The transistor provides drive for the speaker.

Time / Date / Message Video Overlay Generator!: video text overlay circuit

VCG01 PAL / NTSC Video Clock / Message Generator: Video text overlay circuit

Video Clock Superimposer:

Video Message & Clock Generator:


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