op amp

I have an analog Since wave signal that is centered at +2.5VDC and maxes out between 0-+5V. I need to adapt it to the analog read input pin of a 3.3VDC (around 10K-16K internal resistance) microcontroller (nRF52840). I built a voltage divider that moved the +2.5V center to +1.65VDC center...

How can I provide a DC bias to my low pass op-amp filter? I would like the input signal to be centred around 1.65V. My first idea was to use a 3.3V supply, use a voltage divider and then tap off from the centre of the divider and then connect it to the node where C1 enters the non inverting...

I have two TL072 chips, that seem to run warmer than I thought they would. I'm trying to figure out if my results are typical. In both chips, supply is +/- 15V. Each has two 0.1µF MLCCs, configured from + to GND, and - to GND, right next to the power pins. The power source rails have a couple...

Hi guys, I need an insight, please help me. I'm building a non-inverting amplifier, where the goal is to amplify a 32 MHz low-passed-input signal. 1kΩ fixed resistor, and a variable resistor with max of 10kΩ. The original signal is a 100 ps pulse at 500 kHz, connected to a photodiode...

Hi everyone, I'm very new to electronics world and would like to build a basic non-inverting amplifier using the LM7171 BIN op-amp. My goal is to amplify a 1V DC input, and I'm using a simple feedback configuration: a fixed 1kΩ resistor from input to ground, and a 10kΩ potentiometer from...

I'm designing an analog output that takes a 0-5volt from a DAC and uses an op amp to step it up to 0-10volt, then turns it into a 0-20ma signal with a XTR111 and can use a switch to output 0-10v or 0-20ma. I want to make sure everything looks good before I start my first prototype.

Hello, i'm a student and i need a bit help to understand a circuit (attachment). Attached is the schematic of the DO2 meter from DFRobot (https://wiki.dfrobot.com/Gravity__Analog_Dissolved_Oxygen_Sensor_SKU_SEN0237#More). The circuit gets attached to galvanic DO probe, which should output a...

Hi guys, I bought a 2k ohm 10 turn potentiometer, I’m trying to use it with arduino analog pin. The problem is that when the pot gets to a certain value the arduino turns off (I think it might be the over current protection). I have allso tryed to use a op amp as a buffer before the analog pin...

Hello guys, I bought an op amp from mouser, the LMP7721 (data sheet below). I have been testing it, I soldered it to a break out board. after connecting 3.3v supply from an arduino uno to v+ and v- and connecting in- to vout I measured between ground and in+ 1.2 to 1.8 V. if I disconnect vout...

Hi everybody, I'm taking a beginners DC circuitry course and I'm trying to learn on my own time about analog circuitry, something which has fascinated me for a while now. One of the things I'm trying to start with is, as the title states, a voltage follower, since this is (supposed to be) a...

Hello everyone, I'm currently having some trouble over a lab practice in which I was required to build an op-amp based function generator. The primary requirement is to generate square and triangle waves (varying their frequencies through potentiometers) using LM-741 IC's. Initially, our...

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...

Dear all, This is a repost since the original post (https://forum.allaboutcircuits.com/threads/that1512-alternative-for-diy-microphone-project.188951/#post-1760251) was in the wrong section This is the project I am trying to recreate I'm looking for a way to make the preamp created in this...

Hello, what would happen if, in my operational amplifier, some transistors are not in saturation at a certain input voltage? I find it quite hard, nearly impossible, to maintain tall the transistors in the saturation region for every input voltage, some of my transistors leave the saturation...

Hello, I have designed a two stage op amp with a phase margin of 63° ( with a compensation capacitance) which is sufficient to ensure good stability of the circuit. However, I still have a huge overshoot problem when I use it as a follower. How is it possible if my circuit is stable and how can...

Hello, I have to design a single op amp circuit that has only +15v, -15v and GND as input and outputs a symmetrical PWM signal (+V and -V) with adjustable frequency and duty cycle. I have something that works partly but not completely, I can adjust the duty cycle from ±60% to ±100% but af that...

Hi all! I am new in op amp, and currently studying the basics of it.. So I designed this LM741 circuit with a single supply, I made the input at the V+ to be 1.5v supplied by a voltage divider, and a gain of 3 with feedback resistor being 20k and R1 being 10k. My problem is, according to the...

Hi everyone, I was designing a filter and my team wanted to ensure the total noise to be as low as possible and hence searched for low noise op-amps. I'm actually having a problem with the term Input Voltage Noise Density, like for AD8605, the datasheet mentions Input Voltage...

I am currently trying to design a bandpass filter in a simulator for a university assignment to the following criteria: Frequencies below 1KHz and above 250KHz should be attenuated. Note that you will need to calculate the cut off frequencies given the pass band (1KHz to 250KHz) should not be...

I have an AC input of 0-5V that i need to go from -2.5 to 2.5V. this will then go through an op amp and then trough a push pull amplifier configuration. I just cant seem to find a value for the capacitor that will work, so if someone could explain where im going wrong that would be greatly...