opamp

Vo = -R13 / R14 x Vx + (R16 / R15 + R16 x R14 + R13 / R14) x Vy Vo = 4 + 4,5 = 8,5V hello everyone In this case, in order to find Vo, the equivalent of Vo comes in this way. But I understood everything until the -R13/R14 x Vx part. But I couldn't understand how to do the inside of the next...

Hi, For a school project I had to design a opamp for audio amplification. I now would like to do an ac analysis on just the intermediate stage to see the gain and input impedance yet i am not sure how to simulate this. I remeber a TA talking about adding a feedback resistor that is 0.1 AC 1T...

Hi. Im currently designing a three leg shunt circuit. Im reading every shunt voltages using INA180A1 and output of the current sense amplifiers connected to the mcu. Mcu has internal overcurrent and short protection but system is very critical that shouldnt leave MCU alone for this purpose. So...

Hi, I would like to make this INA works in the best range of output voltages for input differentail voltages from 40mV to 80mV. According to datascheet I should have 100 V/V gain. It isn't true even with Vref = GND (I get G=65). I thought I have to put +3V on Vref to decrease 8V to 5V on output...

Hello, I used Behzad Razavi's book to design a fully differential telescopic op-amp [screenshot attached]. Then I follow the same steps to design my proposed opamp, but I am not getting the desired result. Can someone point out where I'm doing mistakes? For your reference, I have attached hand...

I have a few questions regarding the circuit above. 1. Why do we want a voltage follower in this case? Could we drop it? 2. Why is there a 100ohm to ground? (bottom left) Why exactly 100ohm? Does the value of this resistor matter? 3. What is the use of the variable resistor? Couldn't we just...

Hi, I'm new at this forum and to LTspice. I need to know how to build either a new model or a sub-circuit for the LM358 device. Once I have the file LTspice manual tells me how to include it into the simulation. Thanks in advance for any input on this question.

Hi, my friend and I had tried combining lavalier mic and funnel as DIY stethoscope connecting to phone for telemedicine. During a video call, the heartbeat can be clearly heard from the headset but not the lung sound. I think if the signal from lavalier mic can be amplified it would lead to...

Hi everyone! I'm Buse. I'm trying to control a motor speed for a personal project. You can find the schematic of the circuit I found on a book. This circuit works with only the PID parts constructed. My problem starts when I add the other parts. For example, U1 opamp (top left) is supposed to...

Hello everyone, I am designing LPF based differential demodulator(LPF_DDM) to retrieve differentially modulated signals, which are on-chip capacitive isolated [shown]. LPF_DDM includes a differential amplifier, LPF, and Schmitt trigger. I designed a two-stage opamp [specification below], as a...

Hello I'm trying to implement the function Flux = 55m * tanh (5 * x), but I'm just getting errors. Does anyone know any way to solve this?

Hi Guys I am working on a private project where I need to detect a blue light flashing up. But the OpAmp I am using is always on HIGH regardless of the brightness of the blue light. I have also tried various OpAmp circuits but they all resulted in the same. I've tried feedback resistors of up...

I'm trying to sim the input circuit of an audio EQ, but I'm getting only DC at the output. This is what I'm trying to simulate: It's the input section of this schematic: Here's what I've created, the .ASC is attached: I'm using an LT1057 model as it is described as a drop-in...

Hello I am currently build GreatScott's diy microphone and he uses an NJM5532 op amp but those are not readily available here in Australia. I have looked into buying them online however, shipping cost around $20 and that's very expensive compared to the price of the op amp. Does anyone know a...

I should amplify a low impedance signal with the peak of maximum 1.4V. The tricky part is that the signal itself is not important but the tail of the signal is important which might show some decay (falling edge could reach to zero sooner or later than normal) and these signal decay variations...

I currently made a module to my project which isn't quite functioning correctly. It's 4 distinct parts on one board. The radio I/O, the two independent sound amplifiers out of the LM386's and the RFID card reader. This is the circuit: The actual inverter IC I used is 74HCT04 because it...

Hello sir, This post might be a silly one, but my stupid brain does not find it well. I am looking for a signal generator circuit to fed different frequencies in other circuit. I have found one, take a look But, the person who posted this did wrong on inverting and non inverting sign...

I want to drive piezoelectric transducer with resonant frequency 110khz and input voltage 70 volts ac with arduino. I generated a square wave of same frequency with arduino than converted it into ac voltage using RC filter than for the step up I used transformer small getting amplitude of 67...

I have a function generator (Escort EFG 2210) as a source to a UV-LED (LED255J ). The FG delivers about 7.5 Vrms and 30 mA pulse signal. The LED requires closer to 100 mA for optimal emission. The voltage is good enough. I have tried various amplifier circuits, but end up with less current than...