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Clock Circuits
Clocks:   #-A      B-C      D-G       H-O      P-S      T-Z


Last Updated on: Wednesday, June 02, 2021 04:22 AM

Circuits Designed by Dave Johnson, P.E. :
Poor Man's Timer -  Often during testing of certain equipment and components, you would like to keep track of the elapsed time in hours, minutes and seconds. There are some nice commercial digital timers and counters available for just this sort of application. However,  . . . [Hobby Circuit designed by Dave Johnson P.E.,  08/24/08]

Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

Pacer clock saves subroutine calls -  11/10/05 EDN Design Idea   Time-delay routine requires no subroutine calls, avoids stack-overflow hazards. . .  [by Enver Torlakovic, Willmot, New South Wales, Australia]

 

Panel-mounting clock -  . . .  [Written by Hans Summers]

 

 

PC's parallel port to program a clock source -  12/07/04  EDN Design Idea   This Design Idea shows how you can use Linear Technology's LTC6903 programmable oscillator as a clock source for direct-digital synthesis, data conversion, switched-capacitor filtering, clock, and voltage-controlled oscillator circui. . .  [by William Grill, Honeywell BRGA, Lenexa, KS]

 

PIC Digital Clock Timer -  This clock timer uses a PIC16F628 microcontroller to display 3 and 1/2 digit time and control an external load. The clock includes a calendar with leap year and optional daylight savings adjustments. The timer output can be set from 1 to 59 minutes and manually switched on and off. The clock also has a correction feature that allows an additional second to be added every so many hours to compensate for a slightly slow running oscillator. The oscillator uses a common 32. 768 KHz watch crystal and the frequency can be adjusted slightly with the 24pF capacitor on the right side of the crystal. . .  [Bill Bowden]

PIC Tock Video Clock -  PIC-Tock is a video clock using a PIC16C61. In the tradition of Marv Newland's "Bambi Meets Godzilla", there is far too much ROM space spent on credits, which are smooth-scrolled horizontally on the bottom of the screen. . . .  [Circuit designed by Eric Smith]

 

PIC16F873 Digital Clock -  On this page, I will introduce the PIC controled circuit which is the heart of Ultra High Accuracy Digital Clock. For the details of the clock, refer to "Ultra High Accuracy Digital Clock version 2".
As for PIC, PIC16F873 is used in the relation of the input-output port. Also, to make a circuit compact, CPLD is used for the peripheral. . . .  [Seiichi Inoue's Web Site]

 

PID-Control with 68HC12 -  . . .  [Ludwig Orgler-Fachingenieur Elektrotechnik]

 

PLD implements fast four-phase clock generator -  10/27/94  EDN Design Idea   The circuit in Fig 1a can clock pipelined logic in PLDs by an external agent at one-half the usual frequency. You can use this circuit when designing pipelined ALUs and switched-capacitor circuits. I used this circuit to drive a 40M-sample/sec CMOS flash. . .  [by Said Jackson, Hamburg, Germany]

 

Poor Man's Timer -  Often during testing of certain equipment and components, you would like to keep track of the elapsed time in hours, minutes and seconds. There are some nice commercial digital timers and counters available for just this sort of application. However,  . . . [Hobby Circuit designed by Dave Johnson P.E.,  08/24/08]

 

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