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

Circuits Designed by Dave Johnson, P.E. :
  • Three-Minute Closet Light -  I have a coat closet by my front door. The thing is very dark at night and really needs some kind of illumination inside. I could hire an electrician to install a light in the closet ceiling and then wire it to a toggle switch outside the door but that would cost me quite a bit of money . . . [Circuit by Dave Johnson P.E.,  12/25/11] 

  • Timer for Darkroom Camera Shutter -  This circuit was designed to control a film exposure shutter for a darkroom. It has 8 time steps ranging from 0. 35 seconds to 4 seconds. It is activated by a foot switch and draws power from an external 12-volt DC supply . . . [Hobby Circuit designed by David Johnson P.E.,  06/11/00]

  • Two-Transistor Low Power Oscillators -  This page has two unusual two-transistor oscillators. I set the component values for a low frequency application. Both circuits draw only about 1 micro amp of current . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/14/02]


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

Tanktwanger circuit puts a New spin on clock synthesis -  02/03/97 EDN Design FeatureAn unusual circuit, the "tanktwanger, " provides some clock-generating and -adjusting advantages over conventional clock-synthesis methods. You can adapt the main circuit for numerous applications, but you must take care when c. . .  [by Glen Chenier, Fitel Photomatrix]

 

TB028: Technique to Calculate Day of Week -  Application Note Published 23-Aug-99. . .  [Microchip]

 

 

Termination supply tracks one-half core voltage -  04/27/00 EDN Design Idea   Modern µPs typically require core voltages of 2 to 3V. They also require "termination" voltages that, for best performance, should equal half the core voltage. The problem is, core voltages vary among CPUs, and some systems even . . .  [by Chester Simpson, National Semiconductor, Santa Clara, CA]

 

The HC11 Controls the Stepper -  . . .  [Ludwig Orgler-Fachingenieur Elektrotechnik]

 

The Science of Timekeeping -  Application Note. . .  [Aligent]

Three-Minute Closet Light -  I have a coat closet by my front door. The thing is very dark at night and really needs some kind of illumination inside. I could hire an electrician to install a light in the closet ceiling and then wire it to a toggle switch outside the door but that would cost me quite a bit of money . . . [Circuit by Dave Johnson P.E.,  12/25/11]

 

Timer for Darkroom Camera Shutter -  This circuit was designed to control a film exposure shutter for a darkroom. It has 8 time steps ranging from 0. 35 seconds to 4 seconds. It is activated by a foot switch and draws power from an external 12-volt DC supply . . . [Hobby Circuit designed by David Johnson P.E.,  06/11/00]

 

 

Transcendent Frequency Counter -  This is a top quality project designed to obtain maximum performance. The hardware and software has been pushed to reach the frontier of technology. The transcendent is not only a frequency counter, it is a corner stone in your successfully constructions. . . .  [can't find owner's name on website]

 

Two nixie display clock -  My clock building habit is apparently as bad as ever. This time, it was inspired by a stash of Burroughs B5092s, so I needed to vertically align it. Also, since I wanted to make it as small as possible, I wanted to keep nearly everything surface mount, so I abandoned the idea of using 74141s in favor of standard BCD to decimal converters plus some external drive transistors. No need to multiplex since I'm only using two tubes, so this design is actually pretty straightforward. . . .  [© 2007 by Riad S. Wah[by]

 

Two-Transistor Low Power Oscillators -  This page has two unusual two-transistor oscillators. I set the component values for a low frequency application. Both circuits draw only about 1 micro amp of current . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/14/02]

 

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