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Timers and Counters Circuits,
Page 1b Timers & Counters: Next #-APrevious #-AB-EF-LM-S T-Z 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:
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...
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....
