Questions tagged [hysteresis]

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1answer
199 views

Is magnetic hysteresis present even with a DC bias?

Consider the following circuit: With Vin(t) = A sin(ωt) for some given frequency ω. The relationship between Vin and Vout is certainly non-linear, because of the effect of hysteresis in L's magnetic ...
4
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2answers
113 views

I am facing a problem while designing a Schmitt trigger circuit

I am applying a Schmitt-trigger to the waveform given in the figure below. . This is a 3.5 volt signal and I want to perform thresholding so I use 1.58 volts as upper threshold and 1.17 volts as lower ...
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0answers
42 views

Schmitt trigger based NAND gate

If someone can help me to understand how to calculate the hysteresis of the Schmitt trigger-based NAND gate? Which MOSFET's dimension decides the Vth_H and Vth_L? Thanks.
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1answer
44 views

Weird hysteresis behavior

I am an EE student and recently we worked with Schmitt triggers, positive feedback loops, and hysteresis. I was curious and hooked up an mcp601 without a feedback loop as such: In the above schematic ...
2
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2answers
66 views

Hysteresis on LTspice with thermistor

I'm trying to simulate an hysteresis on LTspice. The goal is just to see how evolve the output voltage in function of the value of the thermistor. For this, I have done a simulation with several steps....
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1answer
64 views

Op-Amp dynamic hysteresis

What is dynamic hysteresis in Op-Amp? I read section 4.3 of the this App Note and was not clear. Can someone explain me why this is happening?
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5answers
862 views

Can we declare Schmitt triggers to have memory? Can we call their output levels states? [closed]

Are Schmitt triggers able to be declared as having memory? Can we call their output levels states?
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0answers
47 views

Comparator output problem

I have this comparator circuit using an op-amp. This is my actual op-amp used in the circuit. I have used TL072 as I didn't have the simulation model. This circuit is used to trigger the output when ...
0
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2answers
62 views

How is the effective parallel resistance of this resistor network determined?

I have this circuit: The effective resistance at the reference node of D4801 is given as Rb = R4802||(R4805+(R4807||(R4806+R4808+44KOhm))) = 9.129KOhm I am not able to understand how this formula is ...
0
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1answer
27 views

MAX882 battery protection

I am thinking of using the MAX882 IC to protect my battery from overdischarging. What I could not understand from the datasheet I provided is that, if I use the STBY pin to set a threshold for my ...
2
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1answer
128 views

Comparator hysteresis input signal filter

I need to heavily low pass filter an input to a hysteresis comparator, but due to the fact that R1 is one of the components setting the hysteresis, I can't add additional RC-circuits in series with it....
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2answers
41 views

How to define the hysteresis of the buck-boost operation mode?

In the buck-boost (transition) operation mode of a four switch cascaded buck boost converter, there is supposed to be a hysteresis to prevent bouncing. How do we define the hysteresis in this case as ...
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2answers
93 views

RS485 Input Hysteresis

What is the meaning of Input Hysteresis in the context of a RS485 transceiver? Thanks
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1answer
85 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 ...
1
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1answer
31 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 ...
2
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0answers
36 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
162 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 ...
0
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2answers
225 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 ...
2
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0answers
136 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 ...
0
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2answers
75 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 ...
0
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1answer
41 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. ...
0
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1answer
35 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 ...
0
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2answers
47 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
46 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
59 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 ...
2
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3answers
847 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 ...
0
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3answers
322 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 ...
2
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0answers
101 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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0answers
65 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 ...
0
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2answers
108 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 ...
3
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2answers
2k 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 ...
3
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1answer
299 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
2k 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 ...
0
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1answer
118 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 ...
1
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5answers
525 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 ...
0
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4answers
248 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 ...
0
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1answer
63 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
26 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 ...
3
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4answers
1k 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 ...
0
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0answers
221 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 ...
1
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1answer
491 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 ...
0
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1answer
54 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 ...
1
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2answers
569 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 ...
6
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2answers
1k 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=500\mu\text{s}\$. My upper ...
0
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1answer
327 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 ...
0
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1answer
849 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
289 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
98 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....
2
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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
65 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 ...