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Comparator Circuits
Comparators:  #-A     B-C      D-E     F-L      M-R    S-Z
Last Updated on: Wednesday, June 02, 2021 05:07 AM

Circuits Designed by Dave Johnson, P.E. :
  • Thermostat for 12v Cooling Fan -  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 David A. Johnson P.E.,  02/06/11]
     

  • Version 4 of a DC Current Indicator -  The circuit below uses some common components to turn on an LED whenever DC current above a certain level is detected. The circuit uses a very popular LM393 dual voltage comparator from National Semiconductor and a common 1N4148 signal diode. The diode . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/16/05]


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

 

Schottky Diodes Improve Comparator’s Transient Response -  01/21/10  EDN Design Idea   Two Schottky barrier diodes clamp error voltages, cut output glitches. . .  [by Marián Stofka, Slovak University of Technology, Bratislava, Slovakia]

 

Synchronized Window Comparator Eliminates Error -  05/11/95 EDN Design Idea   Precision A/D converters need a window comparator. The window comparator in Fig 1a is synchronized to the clock signal. This synchronization eliminates errors that could arise when the input signal crosses the high or low thresh. . .  [by Sergey Velichko, Consultant, Bosie, ID]

Thermostat for 12v Cooling Fan -  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 David A. Johnson P.E.,  02/06/11]

 

Two buttons provide safe start -  07/06/00 EDN Design Idea   The circuit in Figure 1 provides a safety interlock that checks the actuation of two pushbuttons before enabling a relay. When you push both buttons, the circuit actuates the relay. At that point, you can release one of the switc. . .  [by Vincent Himpe, Alcatel Microelectronics, Desselgem, BelgiumVincent Himpe, Alcatel Microelectronics, Desselgem, Belgium]

 

Version 4 of a DC Current Indicator -  The circuit below uses some common components to turn on an LED whenever DC current above a certain level is detected. The circuit uses a very popular LM393 dual voltage comparator from National Semiconductor and a common 1N4148 signal diode. The diode . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/16/05]

 

Voltage Comaparator and Q Multiplier make a stable Sine Wave Oscillator (in PDF format) -  It is a known fact that sinusoidal oscillators must rely on the action of some amplitudelimiting mechanism in order to achieve good frequency and amplitude stabilities. Likewise, accurate loop-gain control and high-Q tuned circuits are required for the attainment of low-distortion output levels. . . .  [Designed by Ramon Vargas]

 

Voltage Comparator -  This experiment only requires a single operational amplifier. The model 1458 and 353 are both "dual" op-amp units, with two complete amplifier circuits housed in the same 8-pin DIP package. I recommend that. . .  [created by Tony R. Kuphaldt]

 

Voltage Comparator Circuits (LM339 / LM393)  -  This page will provide some basic information about voltage comparator integrated circuits and and to act as reference material for other circuits. These circuits are based on the LM339 Quad Voltage Comparator chip. . . .  [from Rob Paisley's Model Train web site]

 

Voltage Comparator Forms Pulse Demodulator -  11/19/98 EDN Design Idea  (File has serval designs)  To process low-level ultrasound or radio-range pulses, you need a signal-conditioning amplifier followed by a pulse demodulator to translate the signals to dc pulses. Traditionally, you would use a diode-demodulator configuration (for example, the circuit in Figure 1a) with one stage of a single-supply op amp. The circuit in Figure 1b does the same job but uses a voltage comparator instead of a diode demodulator. The key to the method is choosing a threshold voltage (VTH) on the negative comparator input that is slightly higher than the dc level of the amplifier output, which is equal to or close to VCC/2. The R4-to-R6 resistive divider determines the difference between the op-amp bias and the threshold voltage. . . .  [by Abel Raynus, Armatron International, Melrose, MA]  

 

Voltage Comparator Switch -  This circuit will provide an indication whenever the input voltage differs from two defined limits, V1 and V2. The supply voltage, Vcc must be higher than the highest input voltage by at least 2 volts. One application here is to monitor a 12V car battery. . .  [Andy Collison's website]

 

Voltage Comparator with Complementary Outputs -  Circuit Ideas for Designers App Note. . .  [Advanced Linear Devices, Inc]

 

Wide Band Zero Cross Detector -  This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150 . . . [Circuit by David A. Johnson P.E.,  02/18/06]

 

Zero-Cross Detector-Wide Band -  This circuit was designed to convert a low amplitude 40KHz signal into a clean square wave signal. It will work with inputs as small as 5mv peak-to-peak or as large as 3 volts peak to peak. The input frequency can range from a few kilohertz to about 150 . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/18/06]

 

Zero-Crossing Detector -  Circuit Ideas for Designers App Note. . .  [Advanced Linear Devices, Inc]


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


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