Questions tagged [hysteresis]

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RS485 Input Hysteresis

What is the meaning of Input Hysteresis in the context of a RS485 transceiver? Thanks
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1answer
45 views

Comparator have hysteresis with pull-up resistor?

I didn't add any hysteresis to below circuit but there's ~500 mV delay between output going high and low, output goes high at 7.5 V but goes low at 7 V: simulate this circuit – Schematic ...
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1answer
21 views

resistor selection for TPS3700DDCR undervoltage circuit

I am designing an undervoltage circuit for a lipo battery project. I found this tutorial here which lead me to the TPS3700. I am wanting the undervoltage condition to be 3 volts. The part that I am ...
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0answers
33 views

Does a pinch imply the presence of memcomponents?

There is a famous article by Chua "If it's pinched it's a memristor", where he defines a memristor as having a "[...] pinched hysteresis loop in the voltage–current plane when driven by ...
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0answers
147 views

Magnetic hysteresis BH curve to compare “Fe-Ni” “Fe-Si”

I am compiling some training material and would like to include a graph to indicate the different characteristics of silicon steel "Fe-Si" and mumetal "Fe-Ni". The best curve I could find in SI units ...
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2answers
88 views

Schmitt Trigger design

Vcc=5V, Vin= a noisy input voltag I'm designing a non-inverting schmitt trigger using voltage divider. As shown from the image, I designed it on LTSpice and I got the desired results but from the ...
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0answers
88 views

What's wrong with my comparator

I'm trying to set up a comparator that goes high when the input is above 0V and goes low when the input is below -5V. I've used the datasheet equations to calculate the resistors for a non-inverting ...
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2answers
64 views

Noisy output from opamp comparator

I built the following circuit to filter noisy pulses from a inductive tachometer pickup. The first opamp (U4D) acts as a peak detector. The second opamp (U4C) is a comparator which uses the output ...
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1answer
37 views

Comparator with Internal Hysteresis

I need clarification regarding comparators with internal Hysteresis. I have a comparator with internal Hysteresis “X” mv and I am using external feedback resistors to create a hysteresis of “Y” mv. ...
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1answer
32 views

What is the cause of the error/unexpected outcome in water temperature control heating system circuit?

Here is the circuit with components I built as shown over here. The title of the circuit is water temperature controlled system. The function of this system is to control the heating while sensing the ...
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2answers
45 views

Calculating core length and question regarding B-H curve

I understand the problem and all (or so I thought), but my answer was way off. Looking at the solution, I realized that I calculated the core length wrong. I don't understand how though. Shouldn't \$...
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1answer
35 views

Interpretation of the graph of excitation current for magnetic circuit

(From Electric Machinery, Fitzgerald) Why does the current waveform here have such a sharp peak like that?
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1answer
51 views

Op Amp Output Voltage with Hysteresis

so I have to design a circuit which lights up 2 LEDs depending on the output voltage of the Non-Inverting Amplifier. I haven't connected the LEDs in the circuit below because it's not part of the ...
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3answers
727 views

Output of LM393 won't swing LOW unless it is pulled up with a LED

I built the following circuit using an LM393 as part of a noise gate for audio applications. It's a voltage comparator with hysteresis. I originally connected a 10 kΩ pull-up resistor and then ...
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3answers
211 views

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
68 views

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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54 views

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
94 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
911 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
172 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
796 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
90 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
406 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
222 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
58 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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0answers
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
816 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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0answers
165 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
361 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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3answers
971 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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1answer
48 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
431 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
826 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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2answers
4k 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
296 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
768 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
231 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 ...
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1answer
93 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
1k 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
63 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
457 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
209 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. ...
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1answer
379 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) ...
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1answer
101 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. ...
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3answers
863 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
131 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
543 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
2k 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
1k 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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1answer
598 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 ...