1. K

    Current Limiting with Schmitt Trigger Circuit Design

    i want to design a circuit that limits the current range to provide protection against high current. I want to use a Schmitt trigger in this design. How can I do this? For example, I want to provide protection between 2 amperes and 15 amperes. When the current falls below 2 A, the circuit should...
  2. nans


    I was going through the comparator topic and realised that it merely compares the input and the reference voltage. Is it necessary to use resistors along with the inputs in such a circuit? I cannot find any effect of these resistors on the circuit or the output yet it seems to be an elementary...
  3. tienk

    Why am i getting a 5 pin comparator when downloading an 8 pin?

    beginner here, i imported a spice file into ltspice but in the datasheet it says its 8 pins but in ltspice its 5 pin, did i do something wrong or am i missing something
  4. B

    Two inputs of a comparator affect each other (crosstalk? )

    I tested a comparator MAX40025 using the universal board and discrete components. The blue curve is one input which is a short pulse, the pulse width is less than 50ns. The green curve is another input which I set to be a constant voltage(the threshold). This constant voltage came from a...
  5. C

    Unusual behaviour of comparator in LTspice simulation.

    I'm trying to build a simple PWM modulator to convert the analog Audio signal into an PWM waveform, the triangle wave generator works fine and i have used an AC sine wave as an audio input, with an DC offset to match with the Triangle wave reference, but couldn't get the comparator circuit into...
  6. B

    How should I input the comparator?

    Hello, I would like to use comparator MAX40025A from Analog Devices. In the datasheet, it mentions that the input common range is from 1.5V to VDD + 0.1V which I don't understand the meaning. Does it mean both the input should be in this range, or the average of two inputs should be in this...
  7. L

    Square wave oscillator based on comparator AD8611

    Hi, I need to create a square wave oscillator with variable frequency upto 200 MHz and (optionally) variable duty cycle. I've got several components for this: a comparator AD8611, an operational amplifiers AD8009 and AD8055. I tried mutiple circuits, but it didn't help. Could someone please...
  8. M

    Latch Comparator - 0.264V above 1.65V or below 1.65V

    I want to use a current sensor IC (like the AC712), but a Chinese one CC6903-10A because it works with 3.3V. There is a circuit in the ACS712 datasheet (page 12) which also appears in the CC6903 datasheet (page 5, middle/bottom right) that is meant to latch when a high current occurs. Now, Vout...
  9. I

    Differential amplifier comparator troubleshooting

    I have build a differential amplifier comparator and it works fine except that instead of switching voltage between zero and 5v, it toggles it between 3.5v and 5v. So, I would like to know if there's a way to make it switch between 0-5v. The schematic is as follows
  10. H

    Noninverting Configuration With Hysteresis-Clarifications required

    Dear Team, I need some clarifications for a non-inverting comparator design. I am using TLV7031 from TI.The circuit configuration is given as shown. In the datasheet it is given as " When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise to VIN1 ". This...
  11. M

    advice on a current measurment circuit

    Here's a circuit i've designed for measuring approximate current flowing through a mosfet. I have a uC that has no ADC, it only has a comparator and an internal bandgap reference voltage. So i can't just connect the drain to an ADC input and divide the voltage by Rmosfet. The line marked "PWM"...
  12. H

    Window Comparator_Pull_Up Resistor_Comparator with Push Pull Output

    Dear Team, Do we need to use pull up resistor when designing a Window comparator using a comparator IC with push pull output(like TLV1805 ). Regards HARI
  13. Sudip Mandal 2

    problem in low battery detector circuit

    I have designed a low battery detector circuit using low power comparator MCP6541 for a 4.2V Li-ion battery. This circuit checks whether the battery voltage if the battery voltage is lower than 3.5V then it will glow LED. Check the circuit below. The circuit is working properly but the...
  14. A

    Driving a mosfet with Comparator

    Hello all, i am trying to get a comparator working with Hysteresis. A 500mV is the target between Vlth 2v and Vhth 2v5. Can somebody please help me with the Hysteresis part with an explanation for the attached LTSpice simulation.
  15. unistudent

    comparator circuit help

    How to make a full bit (2bit) comparator circuit using ONLY nand gates. I was able to do a 1bit comparator using only NAND gates, but how about for 2 bit, 4 bit? Wouldnt it be really large. I'm not sure if my class expects us to draw this out. we can't even use xor gates or inverters. i have...