Questions tagged [comparator]
A comparator compares two voltages or currents and switches an output to indicate which is larger.
978 questions
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Zero-Cross Detector with LM393 + 9 VAC Wall Adapter
I’m building a zero-cross detector using an LM393 OpAmp (as that is readily available with me). My AC source is a wall adapter (plug-in transformer: 120 VAC → 9 VAC). The output block has three ...
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Photodiode + TIA + Op-Amp + Comparator circuit - Needs critique, and design help
I'm a novice at schematic design, and have spent a lot of time and effort redesigning and re-redesigning a schematic for a project I am trying to accomplish. I wanted to deflect a 620nm laser off of ...
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Comparator control circuit
I’m new to EE, I’m a machinery mechanic.
I want to design a hydraulic oil radiator fan circuit by using a built-in temperature sensor. The sensor have 3-wire 24 V GND and signal wire. The signal wire ...
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2N7000 does not work as expected with LM311P
I run a simple circuit using breadboard, LM311P, 2N7000 MOSFET and LED. The work is done in two steps:
the circuit without MOSFET, LED is directly controlled by LM311P:
This setup is fine and works ...
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Strange Output from Simulation for Comparator-Driven NPN Transistor Circuit
I am simulating a leak sensor I have designed using a comparator and an NPN transistor. Basically, when V- < Vref - the BJT will become saturated and conduct current - causing the LED to turn on (...
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Will the TLV7031 low-voltage comparator work with this input voltage?
Since I have not worked with low power currents in the uA range before, I would like to ask you before starting the design. I have simulated the circuit below and have a few questions about it.
When ...
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Inverting and non-inverting comparator hysteresis
I am designing a circuit that routes two signals through two comparators based on the battery voltage.
Comparator 1 (relay control): The first signal drives a MOSFET that sinks a relay coil to ground ...
3
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2
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Errors when building a single-supply Schmitt Trigger?
I was attempting to build a particular Schmitt Trigger in order to learn more about it. It's from the "Design with Operational Amplifiers and Analog Integrated Circuits" by Sergio Franco. On ...
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Why does given cicuit works as an oscillator and finding the oscillation frequency
The circuit:
simulate this circuit – Schematic created using CircuitLab
My work:
when \$\phi_1\$ = 1 and let intially Vout= VDD, the capacitor C1 will charge to \$C_1V_{DD}\$
When \$\phi_2\$ = 1,...
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How to make two components trigger together?
I have a feedback circuit for a device I am designing. The goal is to sense temperature changes with thermistors and then if certain conditions are met I want to use an analog switch to disconnect a ...
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Detecting blown fuse in LV AC circuit
I have the input stage to a power supply configured thusly:
Further regulation of the 12V rails is downstream of this figure and is outside the scope of this question.
I would ideally like to have a ...
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Delay of the LT1719 comparator
I have the following schematic of my real circuit. As the datasheet demands, I added 10 nF capacitors close to the supply voltage pins on the PCB.
I noticed a delay in the output signal before the ...
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LM 393 module connection wiring diagram not matching photo of module [closed]
Im waiting for delivery of a LM 393 module, trying to figure out the wiring diagram. I wish to connect a membrane switch to activate a 12v output signal. I have achieved this with a LM 393 module with ...
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What is the purpose of pulling up the output of a comparator to VCC? [duplicate]
Newbie here. I don't understand the purpose of resistor R3 here after the output of the square wave oscillator. Can someone explain? Thanks!
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Comparator crisp output
I have circuit where I am trying to enable a buck converter only when the input power is above 11.5V. And it should turn OFF when its below that voltage. I have a two voltage dividers. One with a ...
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