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3.735 op-amp questions.

Non inverting Amplifier- LF351N BJT - BC337 Gain = 5.8 Opamp Supply Voltage is +12V & -12V Transistor Collector voltage is =12Vdc Opamp I/p = 1Vpp(Sin wave) Opamp O/p = 5.8Vpp Opamp O/p is ...

I've been research metal detector designs for a few days now and I can't quite wrap my head around the amplification they are using for the first stage right out of the coil. Below is an example ...

I know this topic has been discussed a lot, but there seems to be varying opinions about the solutions.. The problem is we are trying to make a current source with an op-amp driving a FET as the load....

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 ...

Good evening Community, I would like to use the MCP602 model in LTSPice, but I am having simulation errors. Please see schematic below. I have downloaded the model from Mircochip and opened it via ...

I am implementing a Schmitt trigger using the circuit shown below. This circuit consists of one LM741 op-amp, which acts as an asymmetrical Schmitt trigger with a single power supply. According to ...

I have a question regarding SR effect. Let's say that we have some simple amplifier with op-amp with the following parameters: \$G=+10 \ V/V, \ f_c=1MHz, \ SR =1V/\mu s, \ V_{supply}=\pm 15V\$ ...

When I was looking for some information how to convert unbalanced audio signal to balanced, it was hard to find info other than "use transformer" or "buy X device to do this". Then I found this ...

We're using the above circuit to drive a sinusoid with constant current into a custom sensor which is best modeled as a series capacitance & resistance (~100ohm, 1uF). The op-amp is single supply, ...

I have been practicing how to analyze op-amps with diodes as I never really learnt them and thought it would be a handy skill to finally learn. I have been attempting a question on here that I found,...

this might be a little silly question, but please advise me. I am trying to use two photodiodes (one for the absorbance measurement and one for the source of the light as a reference) and the voltage ...

First time poster: I want to learn about opamps. I am just a college graduate with no practical experience. What I know: A few basic high level applications such as Hysteresis, Voltage ...

According to subject i am using MG87FE52AE this ic to weighing scale PCB so i wanted extra display from the board. And that board have 6digit 7segment 16pin so i wanted to convert 16pin to 6 pin by ...

I have a design where I am using a LM324 to act as a buffer (unity gain impedence transformation amplifier) to feed the voltage from several high-impendence voltage dividers into my MCU's ADC pins. ...

I am trying to find the -3dB freq. denoted \$f_H\$ in the following circuit, where \$R\$ has been replaced with a capacitor \$C\$. I tried doing that in two ways which yielded different results. I'd ...

splitter design

1 answers, 37 views op-amp buffering
I want to split the signal from my electric guitar to 6 amplifiers. Does this splitter design look legit? I want to use 6 fet op amp followers to do it. R2 - R7 are 47R to prevent oscillations (they'...

simulate this circuit – Schematic created using CircuitLab I use LM741 as a comprater for solar day and night automatic switch but the output is low that is on 9v what is the problem in my ckt ...

I been scratching my head for the past couple of hours, and might be going mad. If someone can shine some light on this I would be extremely happy. This is probably root elementary to some but I am ...

There are various circuit topologies for capacitance multipliers using op-amps. I need to implement a linear integrator where it would be advantageous to reduce the size of the integrating capacitor ...

I am having troubles determining when a capacitor is being charged or being discharged, never understood the concept when a capacitor is under going that process besides the fact when a Source is ...

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 ...

I am trying to test the CMRR of opamp and so measuring offset variation across Common mode range in unity gain mode. I have gone through many articles on CMRR measurement. All those are suggesting a ...

ever since posting here I never been so lost of using op-amps before, hearing new things that I have never heard before (Vom, Vcm etc). I always thought OP AMPS is just plug it in and it will work ...

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? ...

I cannot seem to wrap my head around this. I have read about using an instrumentation amplifier, however even then I am not sure how to use this in this scenario. Could someone explain to me how to: ...

I have a question: What does the diode and the capacitor do in this circuit? What's their role? And how will \$V_{out}(t)\$ graph look like, if we know, that \$V_C(0)=-5V\ , \ SR=0.5V/\mu s\$ and \$...

I am trying build op amp for Wheastone bridge. I got amplified signal but when I try to increase the pressure in sensor nothing happens. The voltage stays the same all the time. I am learning ...

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 cannot understand how this circuit works. https://imgur.com/a/OAQSF4Y I have found a basic explanation online but is not enought to make calculations. "Using three LM317-N devices in parallel ...

I'm using this circuit to amplify a geophone's signals but I'm having trouble understanding exactly how the circuit's op-amp stages work. I'd appreciate any explanation. I'd also like to know if and, ...

I've been using the TI reference design for the microphone preamp (with adjusted values to suit my mic and power supply) the opamp im 'trying' to use is the OPA347PA mic link While the default ...

I have a question about speed at detecting peaks. Essentially, my question is that I have a precision rectifier with a capacitor equipped to the end of it to smooth the incoming full bridge ...

guys once again back with a problem to my AGC circuit, however this is the last one. The problem is the LM833N is clipping around at less than 1.92Vpp at a 4.586V Vcc, I understand this op-amp isn't ...

The circuit below is a resistance multiplier but I am having trouble deriving the effective input resistance, which should be a multiple of \$R_b\$. The answer should be something like $$R_{\text{in}}...

Book pages at https://books.google.co.in/books?id=d-7owi6uNtMC What I see is that they have taken d^2 v/dt^2 as an input at point A, integrated it to get dv/dt, integrated it again to get v=2sin3t V,...

I'm studying for an exam and as a part of a question I am given a transimpedance amplifier and need to explain/show how the current gets converted to voltage. That's fairly easy, however, the op-amp ...

I have this transfer function of a bandpass filter with 2 poles and 2 zeros: $$ H(s)= 10^{-0.8} \frac{\left( \dfrac{s}{10} +1 \right) \left( \dfrac{s}{100.000} +1 \right)} {\left( \dfrac{s}{100} +1 \...

This is the circuit of a PWM temperature sensor, I will give you some details about the circuit: The Electronic control Module which supply power (+8V) at terminal (A) The Electronic control Module ...

I'm having troubles with a 3D printer. I need to change a motor for a more powerful one. For doing so, I 'll have to add an external small circuit to amplify the current but not the voltage given by ...

Just need some help understanding what's happening in removing the DC offset from two band-pass filters. VG has a value of 4.5V. When I added in the virtual ground the circuit had an offset of 4.5V ...

I am preparing for an exam and I have a problem with the following exercise (hope my translation is good enough): We have an op-amp circuit with gain \$G=+1V/V\$ for AC signals and \$G=0V/V\$ ...

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 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 designing a circuit which takes an 3uV at 10-10kHz input that filters, applies gain and integrates the analogue signal. I'm thinking of using the circuit below for the topology using two stages ...

I'm trying to build a basic detector for x-ray or low energy gamma spectroscopy. I have a big photodiode with a CsI(Tl) scintillation crystal glued on top (Hamamatsu S8559 for x-ray detection [1]) and ...

I'm working on a spectrophotometer for a physics project. I've figured out the monochromator already, so for the detector I decided to try a photodiode circuit. This being my first experience with ...

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 ...

There are circuits for constant controlled voltage, and constant controlled current as shown below: Voltage controlled constant current source Voltage controlled constant voltage source simulate ...

I have breadboarded a simple differential amplifier: http://www.ti.com/lit/ds/symlink/lm158-n.pdf what I expect is that OUT=B-A but that only works when the voltage of B is larger than A+0.6, i:e ...

So I have started learning about Operational Amplifiers. In case of idea Op-Amps, Vd=0 as amplification is very large and Vo is limited by Vcc(the supply voltage). Here in this inverting Op-Amp ...

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