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Digital  / Logic Circuits   Page 11
Digital or Logic Circuits:  #'s    A     B     C     D     E - F     G - H
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Last Updated on:
Friday, March 23, 2012 04:30 PM

Circuits Designed by Dave Johnson, P.E. :
  • Poor Man’s Digital Counter Using Pedometer
    There are many occasions when you may want to count something electronically.  Perhaps it is car traffic on a street or items moving down an assembly line.  It might be the number of times a machine is activated or maybe you want to count the number of people entering doorway.  Commercial counting modules do exist but if you want to use something cheaper, you can modify a pedometer to do much the same thing....

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Parallel Port Microchip PIC Micro Controller Programmer -  PIC Programmer is an essential tool if you wish to learn or build projects with Microchip PIC Micro Processors.  This programmer is built using Free Windows Software called WinPicProg and other similar software from PICALLW or Oshosoft ….....
Parallel Port PIC Programmer for PIC18F2550 -  Developed specifically for programming of PIC 18F2550 micro controllers, this parallel port, no-power, programmer is the smallest of all programmers ever built. A DB25 Male Connector, one capacitor and a resistor makes this Port Powered programmer. Programmer takes its power from Parallel Port pins 2-9. VPP for this programmer is 5V and hence "LVP" must be selected in programming software. ….(design added 11/08)
Parallel Port PIC Programmer with ICP -  This programmer is built for Free Windows Software called WinPicProg developed by Nigel Goodwin and uses a 74HC14 instead of 74LS05 used on other parallel port programmers. ….(electronic schematic added 11/08)

Passive Component Selection & Dynamic Modeling for the AD2S80 Series Resolver to Digital Converter -  AN-266 Analog Devices Application Notes  (app note added 2/06)
Passively Probing an InfiniBand System with an Agilent 16700 Series Logic Analysis System -  Passively Probing an InfiniBand with Agilent 16700 Series Logic Analysis System.  Agilent Application Note 2004-03-05  (app note added 06/06/06)
PC Board Layout Checklist: DC-DC Converters/ AB-11 -  Fairchild Application Notes / (app note added 6/06)
PC Power Applications/ AB-52 -  Fairchild Application Notes / (app note added 6/06)
PC Power Applications/ AB-53 -  Fairchild Application Notes / (app note added 6/06)
PC100 Registered SDRAM Module Design -  Pericom Semiconductor App Note # 009.....[App Note]
PC-based configurable filter uses no digital potentiometers -  23-Jan-03 Issue of EDN  Modern instrumentation requires digital control signals. These signals come from a central microprocessor or, in modern context, the popular parallel or serial PC ports. In recent times, digital potentiometers have eliminated the hassles from this interface for the analog section. Designers can replace the resistors of the analog design with digital potentiometers, thus providing the necessary..... [Design Idea by Saurav Gupta and Tejinder Singh, New Delhi, India]
PC-Based Development Programmer for the PIC16C84 -  Microchip Application Note Published 26-Aug-97  (app note added 2/06)
PCI Timing Check using the Agilent E2920 PCI Series Exerciser/Analyzer -  Agilent Application Note  (added 6/06)
Pedometer -  Pedometer has a range of 9.950 meters with2-digits. Slip it in pants pocket for walking and jogging (added 02/05)
Pericom Fct Logic for Hot-Plug Applications -  Pericom Semiconductor Application Note # 003.....[App Note]
Phase Modulated PWM Topology with the ML4818/ AN-42026 -  Fairchild Application Notes / (app note added 6/06)
PIC 5x7 Display -  (schematic / circuit added 10/02)
PIC ADC a Free PIC Based Intelligent A/D Converter -  (design circuit added 8/02)
PIC Based Motor Controller -  (circuit / schematic added 2/03)


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Digital or Logic Circuits:  #'s    A     B     C     D     E - F     G - H
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