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