op amp question

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...

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...

Need some help here. The circuit is for op amp VOS test measurement. The formula given is VOS = Vout/ ACL = Vout/10200. I do not understand how to get the 10200 ACL. Also do not understand how to calculate the feedback resistor for this circuit. I have gone through most of the servo loop...

Hello everyone, I'm building a variable costant current load to test batteries capacity but I don't know what components to use for high voltages like 50v. I'm using the below circuit to create a constant current load and it works fine, but when i tried to attach my ebike battery (42v) the op...

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, I created a low-ohm meter circuit similar to the one described here : https://www.allaboutcircuits.com/projects/build-your-own-low-resistance-meter/ for measuring the contact resistance on a Relay. However the relay's i'm checking have upto 16 contacts, so I created multiples of the...

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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, 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...

Im stuck on my electric curcuit homework could u guys help me

I was trying to derive a model for Opamp Hartley oscillator. I used a R at mouth of opam to increase the output impedance. So i tried including it in calculation. As the opamp is modeled as output voltage of Avi so using a R in series with it with help me to reconfigure the circuit changing the...

Hi I'm currently stuck on current question. Consider the following OP amp circuit in . Obtain the gain vo/vi of the amplifier. What I can see is I can find the voltage on positive and negative pin of top OP amp, which is 30/50*vi (because positive pin of top OP amp is in parallel with 30...