Questions tagged [hysteresis]
The hysteresis tag has no usage guidance.
78
questions
0
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2answers
58 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
votes
1answer
26 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
votes
1answer
48 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....
0
votes
2answers
27 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 ...
0
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2answers
54 views
RS485 Input Hysteresis
What is the meaning of Input Hysteresis in the context of a RS485 transceiver?
Thanks
0
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1answer
51 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
vote
1answer
25 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
votes
0answers
35 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 voltageācurrent plane when driven by ...
1
vote
0answers
154 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
130 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
votes
0answers
97 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
votes
2answers
69 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
38 views
Comparator with Internal Hysteresis
I need clarification regarding comparators with internal Hysteresis.
I have a comparator with internal Hysteresis āXā mv and I am using external feedback resistors to create a hysteresis of āYā mv.
...
0
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1answer
33 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
votes
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 \$...
0
votes
1answer
39 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?
1
vote
1answer
54 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
votes
3answers
766 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 kĪ© pull-up resistor and then ...
0
votes
3answers
234 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
votes
0answers
82 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 ...
0
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0answers
58 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
votes
2answers
99 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
votes
2answers
1k 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
votes
1answer
224 views
Questions regarding eliminating hysteresis in ac dimmer
In the following circuit it says:
āThis 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 ...
0
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2answers
1k 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
votes
1answer
95 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
vote
5answers
445 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
votes
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 ...
0
votes
1answer
62 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 ...
0
votes
0answers
25 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
votes
4answers
875 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
votes
0answers
185 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
vote
1answer
406 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
votes
1answer
50 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
vote
2answers
474 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
votes
2answers
868 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=500Āµs.
My upper threshold of the ...
0
votes
1answer
306 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
votes
1answer
797 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 ...
-1
votes
1answer
260 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
votes
1answer
94 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
votes
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-...
0
votes
2answers
64 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 ...
0
votes
1answer
483 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 ...
0
votes
1answer
218 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
votes
1answer
385 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
votes
1answer
103 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
votes
3answers
923 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 ...
1
vote
1answer
143 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 ...
0
votes
2answers
595 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 ...
1
vote
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 ...
