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Comparator Circuits

Comparators:  #B        C       D - K       L - S       T - Z

 

Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E.

Circuit Indicates Battery Charge Current This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly.  They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2011

Cooling Fan Thermostat (12v) This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2011

Current Indicator for Battery Chargers This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly.  They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current. . . Circuit by David A. Johnson P.E.-January, 2011


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

Calculate Comparator Trip Points 06/10/99 EDN-Design Ideas Using Millman's Theorem to calculate the resistor ratio reduces the time it takes to calculate the trip points on a comparator with hysteresis.  This method eliminates lengthy computations and substitutions.  Using this resistor r__ Circuit Design by Virgil Lawrence, Micro Linear, San Jose, CA

Circuit discriminates & recovers noisy pulses EDN-Design Ideas 09/29/2014     Noisy pulse trains with widely-varying amplitude are recovered with this DI circuit.  Think transducers…__ Circuit Design by Vladimir Rentyuk

Circuit Indicates Battery Charge Current This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly.  They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2011

Clock Tunable, Filter Based Sine Wave Generator A feedback loop enclosed resonator can be made to oscillate.  This circuit’s sine wave generator takes advantage of this and eliminates the need for an amplitude control loop.  This circuit, a mildly modified form of the Regan resonant bandpass loop, is clock tunable and produces sine and cosine outputs. __ Linear Technology/Analog Devices App Note, Mar 26th 2010

Comparator adds current limit to V2 controller 05/21/98 EDN-Design Ideas (File has several  circuits, scroll down) Many step-down controllers satisfy the need for generating low voltages for µPs and logic.  The lower the output voltage, the greater the importance of building a system with fast transient response.  Some new controllers use the V2 control architecture, which provIdeas several speed improvements over.__ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Comparator Detects failed telecomm supplies 06/22/00 EDN-Design Ideas Detects when telecomm power supplys48V output drops below its nominal value, uses an isolated comparator to monitor two48V telecomm supplies(__ Circuit Design by Richard Markell, Linear Technology Corp, Milpitas, CAJune 22, 2000

Comparator Detects position of peaks & valleys in a waveform 05/24/07  EDN-Design Ideas Simple comparator circuit locates peaks and valleys of a waveform in time__ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Comparator Directly Controls Power-MOSFET Gate 11/03/11  EDN-Design Ideas Circuit switching point is independent of unregulated FET voltage.   It is common practice to power a MOSFET with a comparator and with an unregulated voltage and to power the comparator driving it from a regulated one (Figure 1).  Many loads are insensitive to driving voltage, so it would be a waste of money and power to use a regulated supply to drive the FET.  It is also common practice to add resistors R1 and R2 to the comparator to put hysteresis in the operation, making the circuit less susceptible to noise, especially with slowly changing signals.__ Circuit Design by Peter Demchenko, Vilnius, Lithuania

Comparator Exhibits Temporary Hysteresis 10/14/00 EDN-Design Ideas Noise and interference can be significant problems when you transform a signal from a sine wave to a square wave.  When the sine wave crosses the reference level, a comparator can exhibit uncertainty, or jitter.  A common method to eliminate comparator uncertainty is to introduce positive feedback by using a resistor divider at the comparator's output.  The drawback of this method is that the resulting hysteresis produces an offset that's a function of the state of the comparator.__ Circuit Design by Victor Axenenko, CSRI, St Petersburg, Russia

Comparator has Independent Trip Voltages 07/22/99 EDN-Design Ideas For an inverting amplifier with hysteresis, resistors R A , R B , and R F determine the crossover voltages (Figure 1).  Unfortunately, using three resistors to set the upper and lower trip voltages creates a dependence between the two trip voltages: It's impossible to set one voltage without affecting the other.__ Circuit Design by Gregory Billiard

Comparator has programmable limits EDN-Design Ideas July 8, 1998    This circuit combines a dual buffered D/A converter and dual four-input comparator to configure a comparator circuit with a digitally programmable window center and width.__ Circuit Design by Michele Frantisek, Brno, Czech RepublicJuly 8, 1998

Comparator Improves Regulator's Efficiency 04/28/94 EDN-Design Ideas The UC384X family of current-mode PWM regulators requires a current shunt or some other component to develop a voltage proportional to the output current.  This shunt must develop a 1V signal at full load.  For off-line supplies, the 1V requirement is not hard to meet because of the high voltage on the supply's dc bus.  However, if you want__ Circuit Design by Cristophe Basso, European Synchrotron Radiation Facility, Grenoble, France

Comparator provides stable hysteresis 03/18/99 EDN-Design Ideas Unless a voltage-comparator circuitis sampling an extremely clean signal, the comparator always requires some hysteresis.  Traditional comparator circuits obtain the required hysteresis by using positive feedback derived from the ratio of two resistors.  The voltage at the noninverting input is the superposition of a fraction of the input and output voltages, each divided by its respective resistor ratio.  With an inverting comparator, the noninverting input usually connects to a voltage reference with reasonably low impedance, and you can choose the hysteresis-setting resistors without concern for loading.__ Circuit Design by Fernando Garcia, Lucent Technologies, Brownsville, TX

Comparator uses signal-dependent hysteresis EDN-Design Ideas March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]  Sometimes, you need to distinguish between two voltages, using some hysteresis in the decision. When the levels of the compared signals vary over a wide range (for example, a few orders of magnitude), the hysteresis width should vary similarly to ensure a constant ratio between hysteresis width and signal level__ Circuit Design by P Krehlik and L Sliwczynski, University of Mining and Metallurgy, Krakow, Poland

Comparators form 3 to 5V or 5 to 3V translator/transceive 09/02/96 EDN-Design Ideas In many recent systems, you often need to interface 3V signals with higher voltages within the system.  In some cases, it's necessary to interconnect 3 and 5V open-collector transceivers.   Figure 1 shows one example, in which multiple multidrop communications devices interconnect.  In systems where no control lines are available for interfacing, the__ Circuit Design by Robert Hanrahan,  National Semiconductor, Woodcliff Lake, NJ

Cooling Fan Thermostat (12v) This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level.  Both the high and low temperatures are both adjustable . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2011

Current Indicator for Battery Chargers This circuit was inspired by a company needing a DC current indicator light which was small enough to be molded into a medium size 28v rechargeable battery assembly.  They specified that they wanted the circuit to turn on the LED indicator light with 500ma or more of battery charge current. . . Circuit by David A. Johnson P.E.-January, 2011


Comparators:  #B        C       D - K       L - S       T - Z

 


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