Questions tagged [hysteresis]
The hysteresis tag has no usage guidance.
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Schmitt triggers hysteresis symbols
So we're studying Schmitt triggers at university and we got these representations. Searched them on google for more info and got other representations. Now I'm confused. Can anyone help me with some ...
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0answers
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What is a suitable hysteresis value and averaging period for a residential thermostat?
I've built a microcontroller based thermostat that I am using to control my home HVAC system. The actual programming and physical assembly has been straightforward. I'm using DS18B20 sensors, so I ...
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Solar power pump - Design critique and help
Okay so, I have a design that 'works' on the breadboard. But I feel like it could use some improvement. Here is my current design:
simulate this circuit – Schematic created using CircuitLab
...
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2answers
69 views
Hysterisis - How do you choose a good value for R3?
simulate this circuit – Schematic created using CircuitLab
Above is the basic schematic for a comparator with hysteresis. Determining the values of R1 and R2 is fairly straight forward. They ...
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2answers
139 views
What is the common name for this seal-in relay?
I'm trying to build a hysteresis water pump system with 2 water level switches. Please see the diagram and explanation of this setup I've taken off the web:
The first switch (L) is set at the minimum ...
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1answer
53 views
Questions regarding eliminating hysteresis in ac dimmer
In the following circuit it says:
“This hysteresis effect can be eliminated however, using the circuit from a detailed application note from Littelfuse shown in Fig. 6.4.4. Here the capacitor C1 is ...
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2answers
100 views
Calculating resistor values for a Schmitt Trigger and LDR circuit
I am trying to make a light sensing circuit which has hysteresis.
I want an op-amp (LM358) to output logic 1 (12v) when the light level rises above 250 lux, and output logic 0 (0v) when the light ...
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1answer
60 views
Magnetic material demagnetization through Curie temperature
It is known that some materials lose their permanent magnetic properties when they are heated above certain temperature known as Curie temperature or Curie point. As those materials are cooled down to ...
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5answers
165 views
Schmitt Trigger hysteresis
I am studying comparators and Schmitt triggers. And I did not find anywhere how to choose the value of hysteresis. I understand its purpose and I know how to calculate it. But what value is needed for ...
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4answers
155 views
How can I modify this circuit for some hysteresis and better design?
I need to make a circuit even when the push button pushed and released very fast, the final output will stay ON at 12V for roughly a second. %10 accuracy for the timing is fine. An LED will indicate ...
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1answer
42 views
-Ve feedback comparator and its threshold values?
I was trying to analyse and understand the following circuit.
My intention was to calculate the hysteresis of the comparator.
Circuit working: For both compartor input, there will be voltage inputs ...
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24 views
Picking Supervisors for a battery with correct Hysteresis
I am trying to find a Supervisors ic that will detect low voltage(5V) on 6v lead acid battery so I can disconnect the battery from the circuit using MOSFET or load driver.
how do you calculate ...
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4answers
522 views
Magnetic field strength and flux density from hysteresis curve
I am trying to measure the magnetic hysteresis curve of a toroidal nanocrystalline ferromagnetic transformer core made of Nanoperm (datasheet linked) using the following circuit. Each of the windings ...
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96 views
Analytically obtaining the hysteresis of an opamp Schmitt trigger with RC network in its inverting input
This is a follow-up from here. I have got the following Schmitt trigger circuit implemented already on a breadboard. As seen, the input signal at the non-inverting and inverting terminals of the op ...
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1answer
190 views
Comparing two variable voltages with hysteresis
All of the designs I have seen for adding hysteresis to a comparator (Schmitt triggers) assume that one of the two inputs to the comparator is set at a fixed reference voltage (typically with a ...
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1answer
42 views
Op-amp driving mosfet changes hystheresis thresholds?
I have a non inverting push-pull output op-amp with additional hysteresis (Maxim MAX9015) that should drive an N-Mosfet.
I calculated the resistor values for the op-amp(R5, R6, R7) for an older ...
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2answers
278 views
Feedback capacitor in comparator circuit with an OP-AMP
Greetings,
This is a scheme of a comparator with dynamic hysteresis.
Green line is the output
Red line is the input
Blue line is the positive feedback.
I want to ask for the explanation why C1 does ...
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2answers
617 views
Calculating Slew Rate from a time-constant
I have to choose an OP-AMP mainly based on slew rate. I am using the op-amp as a differential comparator with dynamic (time) hysteresis with a time-constant 3*tau=500µs.
My upper threshold of the ...
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1answer
214 views
How to add voltage thresholds with hysteresis to the input of a voltage regulator?
Device to be used in: solar-powered microcontroller with some peripherals attached.
Meant to operate whenever sufficient power is supplied (light is bright enough for a while). No battery, weather ...
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1answer
620 views
How to design a comparator using op-amp?
Intention is to design a comparator with following specification:
Input: 0V to 1.65V, Output: Low
Input: 2.1V to 5V, Output: High
This is the TI design doc I have refereed for the design.
Please ...
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1answer
123 views
Comparator hystereris
Can someone help me to understand a little better how the hysteresis work in this circuit? I can understand the explanation below why VTRP- = vgs2-vgs1 = ....
Also, I didn't find the meaning of the ...
2
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1answer
79 views
Comparator circuit undesirable fluctuations
I have designed a comparator with hysteresis and rail to rail operation and my output depicted in figure1.The inputs of the comparator is a sine wave signal and a triangular waveform as shown below....
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2answers
861 views
Why does hysteretic current-mode control have variable switching frequency?
This figure below is from Raymond B. Ridley Dissertation "A New Small-Signal Model for Current-Mode Control".
Here is an except from the document:
The general implementation of hysteretic current-...
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2answers
58 views
Can I make a peak voltage indicator with a small number of components?
I have a switchmode power supply that rectifies the main voltage with a full bridge rectifier and smoothes it with electrolytic capacitors. Assuming a 115 volt AC power supply, this gives a peak ...
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1answer
363 views
How can I calculate the hysteresis of Reed sensor?
As question says, I want to calculate the hysteresis of Reed sensor and I don't know how. As I seen in Reed sensor's documentation, hysteresis may be x/y, or the difference between x and y, and I'm ...
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1answer
123 views
Is this AN on comparator with hysteresis wrong?
Reading this datasheet of the LM94022, chapter 8.3, where is shown the following example:
I don't know how they get the formulas. I more agree to achieve something like this:
taken from this answer.
...
2
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1answer
344 views
How to calculate hysteresis when the OPAMP supply voltage is changing
I have designed a GSM/GPS based tracker which is installed at my bike. But it is draining battery too quickly.
So, I want to add a cutoff circuit when the bike is not running(battery not charging) ...
0
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1answer
78 views
Transformer Hysterisis
I have the following circuit to plot X-Y plot in an Oscilloscope to get Hysteresis curve.
R2 and C2 are kept so that the cutoff frequency of low pass filter formed is less than 2Hz.
...
0
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3answers
669 views
Open-collector comparator with hysteresis and LED indicator at output
I am trying to choose the correct resistor values to make Vout go high when Vbatt falls below 18V and go low when Vbatt rises above 20V. I've built the actual circuit and my measured values are 18.0V ...
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1answer
113 views
What causes the uncertainty in the threshold voltage of a CMOS switch?
CMOS switches such as the DG419 have a threshold voltage - i.e. the voltage at which the output state is flipped - which is dependent upon the logic level and the positive supply rail. However, the ...
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2answers
436 views
Glitch vs runt pulse due to hysteresis
This is a conceptual question. What I understand is that runt pulse is like a glitch but its amplitude is less than the main pulse's amplitude.
If Im not wrong on this definition, below illustartes ...
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5answers
1k views
Stable output from a potentiometer [closed]
A recurring problem with analogue potentiometers is to get a stable output that only changes when the pot is actually moved (i.e. it doesn't output a lot of extremely similar values due to noise or ...
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2answers
986 views
Adding hysteresis to a window comparator
I have designed a window comparator and am finding it seemingly impossible to add hysteresis. Below is the basic circuit before attempting to add hysteresis.
Now I add a feedback resistor to the ...
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2answers
3k views
Hysteresis in CMOS Schmitt Trigger
!
How does this circuit work? why do you get different threshold voltages for increasing and decreasing Vin?
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1answer
419 views
A question on adding noise and low-pass filer in Ltspice
I’m planning to implement the following Schmitt-trigger circuit:
(left-click to enlarge)
I made some updates with the great suggestions of jonk in my previous question:Some questions on optimizing a ...
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4answers
3k views
Schmitt Trigger Comparator 0 - 5V
I have designed a schmitt trigger circuit using an op-amp where the output switches from 0 - 5V based off an input hysteresis from 2.2 to 2.8V.
My circuit correctly switches at the correct voltages ...
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0answers
479 views
Debouncing and hysteresis questions about a Schmitt trigger circuit
Above is a switching sensor which outputs ON OFF pulses by the 33k pull-down resistor. V2 and R_SW models the switching.
The sensor output is needed to be measured between 1Hz upto 150Hz.
I'm planning ...
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1answer
132 views
USB-UART FTDI chip VIH
I am working with an FTDI "FT232R" IC [USB to UART conversion], and struggling to understand what the VIH spec of the IC is. I can only find reference to an 'Input switching threshold (VIN)' spec in ...
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2answers
463 views
Can a MOSFET be on if there is no current flowing through it?
I am reading about hysteresis comparator here and wondering if a MOSFET can be on if \$V_{gs}\$ is larger than threshold voltage but there is no current flow through it (\$V_{ds}\$ is zero),
As you ...
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1answer
2k views
Hysteresis calculation for “open-collector output comparator” with a pull-up resistor
Standard comparators such as LM2903 and LM311 have open collector outputs.
I see many times the output of these comparators are tied to Vcc by a pull-up resistor (e.g. in a Schmitt trigger case).
...
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3answers
702 views
Hysteresis in a MOSFET's I-V
I've skimmed through several sparse articles online about hysteresis in a MOSFET's I-V characteristics. What I found was sparse, but some articles attribute uneven-ness in the gate structure, causing ...
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2answers
187 views
battery overdischage oscillation protection
I previously asked asked an advice on power control of battery operated system.
The problem was to cutoff the battery when low to avoid overdisharge.
I have built the device according to Olin Lathrop'...
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3answers
3k views
Can anyone explain why a B-H curve with Hysteresis doesn't result in a highly non-linear input-output transfer function for a transformer?
See the attached picture of a typical hysteresis loop, it is clearly highly non-linear even if you keep the signal small enough to stay out of the saturation region (beyond points b,e). So my question ...
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1answer
153 views
What does E/A mean?
I'm trying to understand how does UCC28703 PWM-controller work.
But I don't understand what do the following pictures mean:
and
.
I know they are comparators, but I don't know what does E/A mean ...
2
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1answer
799 views
Intuitive explanation for this hysteresis circuit?
simulate this circuit – Schematic created using CircuitLab
I am trying to get an intuitive understanding of this small circuit.
I have both breadboarded it to look at behavior on a scope and ...
0
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1answer
190 views
ICL 7673 circuit Hysteresis Resistor values
I'm using the ICL 7673 circuit from datasheet "without external PNP transistors".
Please help with deciding Rf and Rs resistor values for 0.5V hysteresis.
Any help is much appreciated.
Please see ...
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2answers
615 views
How to derive the node voltage for this comparator with hysteresis?
I have the following circuit. U26 is a simple unity buffer and U15 is just a dual comparator.
I want the top comparator to compare the battery voltage (VBAT/2) on the inverting input with 2.0V ...
2
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3answers
989 views
What is the drawback of a high-value resistor for positive comparator feedback / hysteresis?
I'm building a simple circuit which has an LM211 comparator at its heart. The positive input is connected to a 10k-10k resistor divider across the supplies, stabilized by a 1uF capacitor. Hysteresis ...
0
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1answer
2k views
Adding hysteresis to MOSFET used as a switch
I have a low-voltage detection circuit which I use to trigger one of two LEDs (green, and red) that is powered off of a +9V battery cell. As the battery discharges, its output voltage decreases, until ...
2
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4answers
974 views
Is there a clever way to prevent a window comparator from oscillating?
Here is my schematic
It's basically a crude battery level detector (I am very aware that this isn't the best way to guage battery life, I'm not here for that) it's not crucial that it is super ...
