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Comparator Circuits   Page 1
Comparators:  #-A     B-C      D     E-R      S-Z
Last Updated on: Monday, October 03, 2011 06:07 PM



Circuits Designed by Dave Johnson, P.E. :
  • ACCEPTABLE VOLTAGE INDICTOR
    I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed.  The circuit can also be used to adjust a particular voltage be within specific high or low limits.  The three LEDs will indicate if the voltage is high, low or OK.  When connected to other converters, such as a frequency to voltage converter, a current to voltage converter or a power to voltage meter, it could provide a quick indication of a proper level.

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

Absolute-value circuit delivers high bandwidth -  15-May-03 Issue of EDN  Most absolute-value circuits have limited bandwidth and high component count, and they require several matched resistors. The circuit in Figure 1 uses three fewer components.... [Design Idea by By Ron Mancini, Texas Instruments, Bushnell, FL]
Absolute-value comparator touts accuracy, size -  7-Mar-02 Issue of EDN  A typical window comparator uses two comparators and a single op amp to determine whether a voltage is inside or outside a boundary region..... [Design Idea by Teno Cipri, Engineering Expressions Consulting, Sunnyvale, CA]
Acceptable Voltage Indictor -  I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed.…. [Designed by David A. Johnson]
Add hysteresis to a voltage comparator -  4-Mar-10 Issue of EDN  Positive feedback is a typical technique for distributing hysteresis around a comparator, provided that you have a resistive path between the comparator's output and the noninverting input. Positive feedback forms two threshold voltages that have (or assume] fixed values. In addition, they depend on the saturation values of the comparator's output stage.... [Design Idea by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy]
An IC Voltage Comparator for High Impedance Circuitry -  National Semiconductor Application Note  (app note added 2/06)
AN-25: Applying the OP06 Op Amp as a High Precision Comparator -  AN-25 Analog Devices Application Notes  (app note added 2/06)
AN-345: Grounding for Low-and-High-Frequency Circuits -  AN-345 Analog Devices Application Notes  (app note added 2/06) Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance....
AN-348: Avoiding Passive-Component Pitfalls -  AN-348 Analog Devices Application Notes  (app note added 2/06) The Wrong Passive Component Can Derail Even  Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For.
AN-349: Keys to Longer Life for CMOS -  AN-349 Analog Devices Application Notes  (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
AN-352: High Speed Comparators Provide Many Useful Circuit Functions When Used Correctly -  AN-352 Analog Devices Application Notes  (app note added 2/06)
AN-41: Precision IC Comparator Runs from +5V Logic Supply -  National Semiconductor Application Note  (app note added 2/06)
AN700: Make a Delta-Sigma Converter using a MicroController's Analog Comparator Module -  Microchip Application Note Published 20-Jan-99  (app note added 2/06)
AN-769: Generating Multiple Clock Outputs from the AD9540 -  AN-769 Analog Devices Application Notes  (app note added 2/06)
AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices Application Notes  (app note added 2/06)
AN-87: Comparing the High Speed Comparators -  National Semiconductor Application Note  (app note added 2/06)
Analog Comparison, Digital Result -  Comparators are very useful for comparing two analog voltages and providing a digital result. In this case, if the light source is dim, a red LED is enabled. If the light source is bright, a green LED is enabled. However, once comparators are understood, they can be useful for driving small robots or helping a microcontroller.
Applications of the LM392 Comparator Opamp Ic -  National Semiconductor Application Note 04-Nov-1995 (app note added 4/02)
Applying the OP06 Op Amp as a High Precision Comparator -  AN-25 Analog Devices Application Notes  (app note added 2/06)
Avoiding Passive-Component Pitfalls -  AN-348 Analog Devices Application Notes  (app note added 2/06) The Wrong Passive Component Can Derail Even  Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For.

Comparators:  #-A     B-C      D     E-R      S-Z
 

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