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# Non Inverting Comparator

24 Threads found on edaboard.com: Non Inverting Comparator

## turn on/off a heat lamp automatic

Use a thermistor (PTC) as temperature sensor and an opamp as comparator (with a potentiometer on the non-inverting input as reference voltage). Once temperature exceeds a value set with the potentiometer, the opamp's output will go low and can switch off a relay that is connected to your lamp. Simple circuit, \$2 worth of components.

## Generating pulses from a Triangle waveform

Depending on timing and accuracy constraints, one simple way to do this is using a peak detector-basically a resistor/diode/cap. The basic operation is as follows: using a voltage comparator, the non-inverting input gets the signal through an RC with a diode across the R, and the inverting input gets an attenuated version (...)

## Op-amp comparator MCP 6004 not working properly.

Hi, I am trying to use op-amp MCP 6004 as a comparator. I am having 0.6V on the non-inverting input. The inverting input is connected to ground by a 5K resistor. So ideally I should see the output go to positive rail because the non-inverting input is greater than the (...)

## Op-Amp Positive Supply drops down..........

Dear All, Pls help me out,Whenever i am connecting Sinewave(5Vp-p\50Hz) generated using XR2206 to TL074 non-inverting Terminal used as an difference op-amp,the voltage of sinewave gets reduced to 1.68Vp-p & simultaneously Op-Amp +15 V drops to 4.68V. I have connected +15 V & -15 V to the Op-amp :smile: Is 680E connected for current limit a

The premise that V(inverting)=V(non-inverting) doesn't apply here. The positive feedback messes that all up. Look at it this way: The output is at VCC. Then the voltage at the non-inverting input is VCC(r1/(r1+rfb); call this V(ni). This means that the voltage at the inverting input (...)

## Non-inverting amp with auto power on/off

Hi. I'm trying to create a non-inverting amp that turns itself on and off whether there's an input signal present or not. The idea is to have a low-power comparator with the input signal connected to the non-inverting input, when the input goes above a sertain threshold, it outputs HIGH thus turning on a (...)

## Increasing 0.15v to >1v?

Use OpAmp rail to rail such as OPA340 to amplify the input - use non inverting schematic with amplification. You need ~20x amplification to get 0.14V to 2.8V

## need help with input buffer/protection circuit

this could be quite simple Here is what you need to do: > Make an OpAmp comparator which has a reference of 3V on the inverting I/P and VCC of 3.3V and Output of comparator connected to the Microcontroller I/P > Give your I/P voltage to the non-inverting Terminal of an OPAMP comparator (...)

## LM339 Spice Model .

As from the ti web site: * LM339 VOLTAGE comparator "MACROMODEL" SUBCIRCUIT * CREATED USING PARTS VERSION 4.03 ON 03/07/90 AT 14:17 * REV (N/A) * CONNECTIONS: non-inverting INPUT * | inverting INPUT * | | POSITIVE POWER SUPPLY * | | | NEGATIVE POWER SUPPLY * (...)

## Need help with Comparator problem

Hi, does anyone know if it is possible to put LM339 comparator into an non-inverting/inverting configuration ( having feedback loop)? I was wondering in what situation I could use a comparator as an opamp and when I couldn't. and under what circumstances an opamp can be used as a (...)

## Question on function of Op Amp

Opamp on the left is an comparator that it(ab)used to control the power true the led. The opamp on the right is a non inverting Amplifier that amplifies 11x

## Texas Instruments TLC372 PSpice Model

Has someone of you already used the TI model provided for PSpice? I downloaded it and tried to simulate the comparator by having a voltage at the non-inverting input larger than the one at the inverting input but the output is always near 0V. Here the model:

## Solinide Feed back - no voltage drop when solenoid is off

Hay I need feed back from the solenoids (24V, 300mA) whether they are switched ON/OFF, I am switching the solenoids using micro controller & IRF510 I kept a resister 1 ohm across the Source to ground and giving the voltage drop to the comparator (non inverting terminal of the LM324) and comparing with ground Point (...)

## About op amp bias current

Hello experts, I am working on a prototype board. I use LM7301 in comparator configuration. See the attached file. When current source I1 is switched off, I expected the V1 on non-inverting input voltage is not above 0.1V which I can accept. But the reality is V1 is about 3.5V!!! After all, the bias current spec in worst case is 500nA. I (...)

## Comparator interrupt problem, pic16f877a

hi, everybody... If anybody using comparator with interrupt please help me out, i am working with PIC 16f877A, using internal voltage comparator module with Interrupt. The inverting pin is connected to 0 to 5 volt adjustable external ref voltage. adjusted for 2 volts. non-inverting pin is connected to (...)

## voltage comparator with interrupt fails, PIC MCU

I am working with PIC 16f877A, using internal voltage comparator module with Interrupt. The inverting pin is connected to 0 to 5 volt adjustable external ref voltage. adjusted for 2 volts. at non-inverting pin is connected to pure sine wave voltage source (0 to 5 volt). I want interrupt should occur when sine wave (...)

## need explanation about amplifier and filter

The analog circuit around LM358 has 2 stages: - a non-inverting amplifier, with A=((R13 + R12)/R1 +1), that uses the first opamp of LM358 (INA+, INA-, OUTA); - a comparator with the second opamp (INB+, INB-, OUTB). At OUTA the voltage is variable, so D7 will give a variable light in the heartbeat rythm. The comparator (...)

## How to get a constant turn over theshold voltage of inverter

Implement your inverter with a differential pair whose non-inverting input is tied to a reference of about 1.1 (your threshold) and the input signal sweeps the inverting input.

## spwm and comparator problem usind pspice.

hello. i'm trying to simulate ,on pspice, the control circuit of 6 MOSFETs in a dc /ac inverter. i want to use spwm for the switching, so i put a comparator(lm339/lm393). a triangular waveform goes to the inverting input, and a sin wave goes to the non-inverting input of the op-amp. the op-amp gets supplied with +10V in the (...)

## Zero crossing detector

How about using an LM311 voltage comparator? Power it from ?12V or ?15V. Use a pullup resistor on the output to +5V (or whatever your logic 1 voltage is). Connect the inverting (-) input to ground and your input voltage to the non-inverting (+) input.