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Discriminator Circuits, Page 3
Discriminators:  #-B     C-H     I-Q     R-Z

Last Updated on:
Thursday, December 07, 2017 02:04 PM


Circuits Designed by Dave Johnson, P.E. :

 

Indicate DC Current Flow -  The circuit below is a simple way to indicate when DC current is flowing through a wire. The circuit is designed so it will turn on a LED indicator light, whenever the voltage drop across a shunt resistor exceeds about 0. 1 volts. The value of the resist . . . [Hobby Circuit designed by David A. Johnson P.E.,  10/16/05]

 

Indicates Battery Charge Current -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/23/06]

 

Indicator for Acceptable Voltage -  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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/09/02] 

Precision AC Peak Detector -  This unique circuit uses a very inexpensive voltage comparator to form a peak detector. The DC voltage produced tracks the positive peak of the input signal. It works from about ten millivolts to about 10 volts peak to peak. The maximum frequency is about . . . [Circuit by Dave Johnson P.E.,  02/11/02]

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

Indicate DC Current Flow -  The circuit below is a simple way to indicate when DC current is flowing through a wire. The circuit is designed so it will turn on a LED indicator light, whenever the voltage drop across a shunt resistor exceeds about 0. 1 volts. The value of the resist . . . [Hobby Circuit designed by David A. Johnson P.E.,  10/16/05]

 

Indicates Battery Charge Current -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/23/06]

 

Indicator for Acceptable Voltage -  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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  02/09/02]

LB-12: Linear Brief 12 an IC Voltage Comparator for High Impedance Circuitry -  Application Note. . .  [National Semiconductor]

 

LB-32: Linear Brief 32 MicroVolt Comparator -  Application Note. . .  [National Semiconductor]

 

LB-39: Linear Brief 39 Circuit Techniques for Avoiding Oscillations in Comparator Applications -  Application Note. . .  [National Semiconductor]

Got Designs?
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if you want me to link to and/or post your original design Thanks.

LB-6: Fast Voltage Comparators with Low Input Current -  Application Note. . .  [National Semiconductor]

 

Light Sensor With Hysteresis -  It is quite a simple circuit but rather more effective than the one using the 741. It uses a simple comparator LM311 as the master piece. This comparator is powered from a +12V DC supply and does not require negative supply to work efficiently. The feedback given to the comparator provides some hysteresis and the potentiometer allows to adjust the sensitivity of the detector for darkness. I am quite sure you could inverse R1 and R2 positions to inverse the action of the detector but I haven't tried it!. . . .  [by Frank Rivard]

 

LM139/LM239/LM339 a Quad of Independently Functioning Comparators -  Application Note 24-Feb-1999. . .  [National Semiconductor]

 

Low Power Comparator with <10uV Hysteresis -  The opamp is used as a precision comparator that drives an NPN transistor to form a logic-level output. Controlled positive feedback into a trim pin makes precision microvolt hysteresis control practical. . . .  [Linear Technology App Note - , Jun 21st 2011]

 

Low Voltage Alarm -  NE555 Low Voltage Battery Disconnect Circuit. . .  [Design by Aaron Cake]

 

Microvolt Compararator with TTL Output -  Amplifiers can easily be used as comparators although somewhat slower than dedicated circuits. Very accurate comparison threshold is provided by the low offset of the Amplifier. Feedback to one of the offset adjust pins adds hysteresis to prevent oscillations when the inputs are close to each other. . . .  [Linear Technology App Note - , Jun 21, 2011]

 

MicroVolt Comparator -  App Note - first published 28-Jun-1996 . . .  [National Semiconductor]

 

Microvolt Comparator with Hysteresis -  Very low offset, 20uV typical, can produce extremely accurate comparator functions. Small input voltages can produce oscillations without hysteresis. Here hysteresis is added to a Vos trim pin to as to not degrade the input precision. . . .  [Linear Technology App Note - , Jun 21, 2011]

 

Missing Pulse Detector Basic -  This circuit is a one-shot that is continually retriggered by incoming pulses. . . .  [Tony van Roon's circuit]

 

Missing-codes tester checks 16-bit ADC in 7 sec -  06/10/99 EDN Design Idea   As the resolution of ADCs increases from 12 to 16 bits and higher, the difficulty in testing the"nomissing-codes"specification grows proportionately. To fully guarantee no missing codes for a 16-bit ADC requires testing all 2 16-. . .  [by Mark A Shill, Burr-Brown Corp, Tucson, AZ]

 

One-Shot Provides Frequency Discrimination -  05/01/03  EDN Design Idea   You use a frequency discriminator to compare one signal frequency with another one. A functional feature, retriggering, of a monostable, one-shot 74xx123 multivibrator can yield frequency discrimination. Figure 1 shows a frequency discriminator that determines the relation of input-pulse frequency to a reference frequency. . .  [by Victor Aksenenka, CSRI Elektropribor, St Petersburg, Russia]

 

Pilot Light Flame Detector with Low-Battery Lockout using a Type R Thermocouple -  The LTC1541 combine a micropower Amplifier, comparator and bandgap reference in an 8-pin package. The part operates from a single 2. 5V to 12. 6V or dual ±1. 25V to ±6. 3V supply with a typical supply current of 5µA. Both the op Amp and comparator feature a common mode input voltage range that extends from the negative supply . . .  [Linear Technology App Note - , Apr 8th 2010]

 

Precision AC Peak Detector -  This unique circuit uses a very inexpensive voltage comparator to form a peak detector. The DC voltage produced tracks the positive peak of the input signal. It works from about ten millivolts to about 10 volts peak to peak. The maximum frequency is about . . . [Circuit by Dave Johnson P.E.,  02/11/02]

 

Precision IC Comparator Runs from Plus 5 Volt Logic Supply -  Application Note 04-Nov-1995. . .  [National Semiconductor]

 

Pulse Generator Has 0ns to 10ns Width, 520ps Transitions -  It is sometimes desirable to produce extremely short width pulses in response to an input trigger. Such a predictable, programmable short time interval generator has broad use in fast pulse circuitry, particularly in sampling applications. This circuit, built around a quad high speed comparator and a fast gate, has a settable . . .  [Linear Technology App Note - , Mar 25th 2010]


Discriminators:  #-B     C-H     I-Q     R-Z


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