op-amp's questions - English 1answer

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I want to make a power meter which I can plug in a electrical socket in my house. I tried around with falstad to measure the current over a shunt and came up with this solution. But the problem is ...

I am using a heart rate sensor whose schematic is provided here. The circuit uses an operational amplifier (towards the right of the figure) which among other things, does a filtering operation. I ...

I am designing an overcurrent protection circuit. I am sensing current with a LEM sensor across a sensing resistor of 16.5 ohm. The voltage drop for maximum current is 2 V. In the next stage I am ...

I'm using an op amp to read a photodiode as pictured here: This is used to detect a 5mw laser diode from a few feet away. The problem is that the circuit appears to accumulate the charge (not sure ...

I am confused about the circuit of an instrumentation amplifier. In class we solved the following example: simulate this circuit – Schematic created using CircuitLab No big deal; with negative ...

In order to double output voltage swing I was going to use two OPA548 in difference configuration, connected to opposite inputs like this: I had one big concern about this circuit - that ground-...

I've been asked to estimate the half-power cut off frequency of the filter and sketch the frequency and phase response. I think the 63% mark is around 1.9 usecs and I need to use the equation f=1/...

An active filter circuit is given in this problem. I want to find the transfer function, but I don't know how to calculate the transfer function of this opamp? can anyone explain it with the exact ...

Recently, I read one paper on Libbrecht-Hall-Style circuit. As shown in the following picture. (arxiv, AIP journal) I found that the circuit uses one LM399 as a voltage reference fed to the non-...

Can anyone help me with this assignment, the professor didn't cover any of this OpAmp circuit in class and expected us to do this :(

How to derive equation of this circuit and how to prove that the gain of this circuit is 8? Thank you.

I have been wondering this for a while. When we look at the electrical characteristics of a device such as an opamp there is a gain versus frequency plot. I have couple of questions regarding ...

As mentioned in opamp datasheets, like this one. I would think stability is a problem at higher gains, due to oscillation. What are the problems with unity-gain?

Recently I have been working with the Analog Devices AD797 op-amp in LTspice, and have been getting poor performance from the amplifier when using a low-amplitude signal. This is my circuit in LTspice:...

I am trying to match an op amp (OP27) to its data sheet while doing some stability analysis tasks in LTSpice. I am following the video provided here (http://www.linear.com/solutions/4449). However, ...

I cannot get the transfer function as I'm not able to get Vout/Vin with reference voltage different from zero. Ia there a way to obtain the t.f? PD: Im sorry about the rotated images.

I have a square signal of 2 ns pulse width (or 2 ns ON time and 6 ns OFF time), 0-1 V amplitude, I wanted to make the signal have sharp rising and falling edges. I tried using the comparators (if ...

I am building a preamp for a sinusoidal current source. I have a two stage amplification process, with a bandpass RC filter in the middle. The second stage amplification is has two outputs from an ...

Im interested on getting long analog integration times, the continuous-time integrator drifts due to DC offset errors such as voltage offset, bias current and offset current, limiting its useful ...

Is it possible to build an OpAmp without using an integrated circuit or a transistor or a vacuum tube? I wanted to see how it would look on a larger scale before miniaturization on a chip. I was ...

I traced this circuit from Induction Motor soft starter. My question is 1) What is the function of Q5 & Q6? 2) How the integrator opamp pin 5,6,7 works, which transistor is used to reset the cap? ...

Since a lock-in amplifier is effectively a high-precision AM demodulator, what are the most critical characteristics for amplifiers in the high-frequency signal chain? Take a 50kHz lock-in circuit for ...

I've constructed a basic dual op-amp LFO as in the below circuit simulate this circuit – Schematic created using CircuitLab The variable resistor R5 is used to alter the rate of the LFO, I'm ...

I have been looking for some time for a good design for a ~10MHz sine wave generator, with variable frequency from about 5-20MHz. The max required peak to peak amplitude is 10V. Many suggestions on ...

Audio DC Offset

0 answers, 62 views op-amp audio dc-offset
I want to make an audio processing device using a Teensy and I want to run an analog signal into it. My background is in audio programming, so electronic circuits are new to me. I realise audio is an ...

I am trying to solve section d in the following question by substituting a current source of -Ios/2 at the '+' and +Ios/2 at the '-', as the resistor(s) found in section c would nullify the output for ...

simulate this circuit – Schematic created using CircuitLab Hi Folks, During my bachelor thesis, I am learning IGBT gate driver cricuits. I am struggling with understanding the following ...

I have been reading the following article about Class-A and Class-B amplifers. http://www.antonine-education.co.uk/Pages/Electronics_2/Amplifiers/Power_amps/further_page_12.htm#Question 1. I am not ...

I am using an LT1630 as a buffer... I know its not the greatest OPAMP for the job because it has fairly Hi input current, but It has good DC characteristic, HI current drive, and rail to rail ...

The circuit is a LPF with a buffer stage in front of it that uses a linear pot. to control gain & attenuation. The setup is such that the response of the linear pot. is similar to a log. pot.. A ...

Update: I've removed all irrelevant information and simplified the question. The OPA548 operational amplifier provides adjustable current limit that can be controlled digitally with a current-out DAC....

I've been working on a project for connecting a Yamaha YM2612 to an arduino and triggering sounds to be played from the chip. I'm having trouble on the audio part of the circuit. I've worked out a ...

I'm trying to build a analog multiplier that takes in two voltages and produces the product of them. I have tried to simulate a circuit. Simulation with this methods is part of the objectives in the ...

As the picture describes, the Vout is the division's result, but we have an error. Because my experience with MultiSim is not at a high level, why does this happen? Is this my fault ? ]1

I am designing a driver circuit to drive a hydraulic proportional valve from an IC's PWM output. (IC is ATmega 2560). The coils on the valve draw approx 3Amps at %100 duty cycle with a power supply of ...

I designed an APC circuit with two APCs on it and a step sequencer, which basically cycles through a series of potmeters with a 5V voltage to it. When I route the sequencer to one discharge pin on ...

The first op-amp is a differential, second one is a follower and third one is a second order low pass filter. I've been struggling with the low pass and the final output of the circuit and I am not ...

I am trying to convert a 4 to 20 mA signal to 0 to 5V. Till now I just used a 250 Ohm resistor to convert my signal to 1V to 5V. Now I am trying to increase the resolution by adding a OpAmp. When ...

I need to calculate the gain of the filter without explicitly calculating the transfer function, ie I have to replace the capacitors with an open circuit. The problem is that I've been trying to solve ...

I am new in designing the active filters though I designed Active low, high and bandpass and notch filter successfully (using Opamp, R and C). But these filters are not actually designed by me :-( I ...

I am trying to compensate input capacitance of the AD4610. It does not matter if it is actually over- or undershooting - there is always a spike: I do not have this problem with the OPA4141 for ...

Can an auto-zero or chopper amplifier be used in a low-pass filter to remove a high frequency carrier? I am trying to design an active low-pass filter with a 1kHz cutoff and very low DC drift, offset, ...

I'm having trouble to understand the phase compensation on the PA92 opamp. First I'll explain quickly the circuit I'm building.   1.  The circuit I'm using a 200V battery and would like ...

I've modeled the above circuit, but the breadboard version does not work. (There are no unexpected oscillations - I'm just looking at DC levels.) I'm trying to shift a 0.4V - 2.0V DC signal to 0V - ...

I am finishing up an embedded project for my vehicle and the last step is to make it automatically power off with the car. The way I detect whether the vehicle is on or not is via a battery pin, which ...

I am using a LM358D dual amplifier at the moment and my goal is to measure over-current on 2 motors. Before I'll be doing that, I made a test setup to test the equations and check the output signal of ...

I am working on a circuit which compares three voltages V(a), V(b) and V(c) by using only op-amps. To result If V(a)>V(b)>V(c) , V(output) should be 15v If V(a)>V(c)>V(b) , V(output) should be 15v ...

As we can see that input fed to this amplifier is the output of final stage of a multistage amplifier and if we apply KVL to base-emitter loop then Vbb is the DC level acquired from the previous ...

I tried to design an inamp for a K-type thermocouple. In theory the gain of this amp should be 250 (close enough to 10 mV/K), and if my understanding of instrumentation amplifiers is correct the ...

I have a question about the input buffer of the PCM4202 ADC. On page 22 of the PCM4202 datasheet, they describe an input buffer. It's pretty standard with gain and filtering. However, the ADC requires ...

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