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Timers and Counters Circuits, Page 1b
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Last Updated on: Friday, March 12, 2010 12:07 PM

Circuits Designed by Dave Johnson, P.E. :
  • 555 Timer Forms Simple PWM Motor Controller
    Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor. (added 7/06)

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

A Precision Wideband Current Probe for LCD Backlight Measurement:  DN101 -  Design Notes (Linear Technology) (app note added 1/06)

A simple Remote control Tester:  (electronic circuit added 10/05)

A Tamper-Resistant Watt-Hour Energy Meter Based on the AD7751:  AN-574 - Analog Devices Application Notes  (app note added 6/06)  With a Current Transformer and a Low Resistant Shunt

A Tamper-Resistant Watt-Hour Energy Meter:  AN-563 - Analog Devices Application Notes  (app note added 6/06)  Based on the ADE7751 and Two Current Sensors

AB-24: Bench Testing LM3900 and LM359 Input Parameters:  National Semiconductor - Application Note   (app note added 2/06)

AC Current Monitor:  Senses high current-flow into power cables.  No wire-cutting, three versions available.  (added 3/05)

AC Line Current Detector:  (electronic (schematic / circuit added 4/02)

AC Voltmeters and ammeters:  Electronic circuit design (added 02/05)

Acceleration Monitor using ADXL202 and AVR:  (circuit / schematic design added 6/06)

Accurate Digital LC Meter:  Based on PIC16F84A microcontroller, 16x1 LCD and LM311 IC (circuit added 8/06)

Accurately measure resistance with less than perfect components:  11/11/04 EDN Design Ideas  / (added 5/05)  For transducers, such as strain gauges or thermistors, you must accurately and inexpensively measure resistance using circuitry built with imperfect components and in which gain and offset errors can significantly limit the accuracy of ohmic measurements. The right circuit topology makes it possible to eliminate most error terms while measuring ohms, leaving the accuracy to be determined by jus...

AC-power monitor uses remote sensing:  04/26/01 EDN-Design Ideas  / (added 6/06)   

AD7751 Reference Board Design in Gerber Format:  AD7751 - Analog Devices Application Notes  (app note added 6/06)

ADC enables temperature compensated Weigh scale measurements:  07/05/01 EDN Design Ideas  /  (added 1/05)  You can provide temperature compensation in weigh-scale applications by simultaneously measuring both the temperature of the bridge and the primary output of the bridge transducer. Traditionally, an integrated multiplexer connects multiple input variables to a single sigma-delta ADC. Each time the multiplexer switches the input, the ADC must flush the digital filter of all data pertaining to t......

Adc's Reference Improves Rtd Measurements:  10/27/94 EDN-Design Ideas / (added 6/06) Temperature measurements using RTDs (resistance-temperature detectors) generally employ bridge circuits with stable power supplies for signal conditioning. Unfortunately, this scheme generally produces nonlinear outputs. A linear bridge configuration that uses two identical current sources depends on the accuracy of matching the sources....  

ADE7755 Reference Board Design:  ADE7755 - Analog Devices Application Notes  (app note added 6/06)  In Gerber Format

ADE7758 Phase Dropout Detection for VAR Calculation:  AN-750 - Analog Devices Application Notes  (app note added 6/06)

Adjustment Free Inclinometer operates on 27V:  04/24/97 EDN-Design Ideas  / (added 3/03)   

Advanced VHF Power Meter:  (circuit / schematic design added 10/06)


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