All Questions
Tagged with linear operational-amplifier
20
questions
-1
votes
3
answers
140
views
Active low pass filter is there any virtual ground point? If yes how can I derive?
I'm learning this MFB active LPF.
My questions regarding this as follows:
How to derive transfer function for this configuration?
Is there concept of virtual ground exist? If yes can you explain ...
- 303
0
votes
0
answers
243
views
Subtractor using op-amp
I need to create a subtractor on LT spice using an LT1028A to emulate the difference between 90V and 23V; resulting in 67V. I have tried using a variety of resistance pairs, but in vain. Could anyone ...
- 23
4
votes
2
answers
3k
views
How to add CC/CV feature with single LM358 for variable linear power supply?
I have a few weeks with a problem in the design of my bench power supply. First of all I have this design from this guy on YouTube https://youtu.be/_CFIovMkRyg that made a variable power supply using ...
- 51
0
votes
2
answers
164
views
distance between linear and non-linear function of op-amp system
I have a circuit which I have taken a picture of as you can see, in which i have values of
$$R1=1k\Omega,R2=10k\Omega,R3=10k\Omega.R4=10k\Omega,R5=20k\Omega$$
and sine input signal with off-set value=...
1
vote
0
answers
112
views
Linear Regulator Operation
I have a linear regulator with three pins. It's identifier is LM7805.
I've taken a look at it's datasheet and it looks unlike linear regulators I've encountered.
Is the the op amp circuit included in ...
- 121
3
votes
6
answers
1k
views
Converting 0-5 volts (linear) to +2.5 -- 0 -- +2.5 volts ("vee")
I'm trying to find a simple way to convert a 0-5 V output from a joystick hall effect sensor to +2.5 -- 0 -- +2.5 V. Here's how I want the response to look:
The output voltage will be sent to a ...
- 343
1
vote
1
answer
457
views
How are op-amp gain vs frequency response curves generated?
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 ...
- 12.2k
0
votes
1
answer
290
views
I need a circuit for a linear integrator using a capacitance multiplier
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 ...
- 157
0
votes
1
answer
692
views
opamp voltage offset balance resistor for varying input Z
I'm using a non-inverting amplifier to amplify AC signal, datasheet of my opamp say this
balancing resistor be used to reduce the offset errors, balancing resistor equals the parallel combination ...
- 290
10
votes
4
answers
6k
views
Adding a resistor to reduce crossover distortion in an LM324/LM358
I was watching a video of the legendary Bob Pease, in which he says that the regular LM324/LM358 is not a low distortion amplifier, however, if you add a 10K resistor from the output of the opamp to ...
- 2,780
0
votes
1
answer
4k
views
Why is such amplifier configuration chosen for HB100 microwave sensor?
For HB100 microwave sensor module, I don't quite understand how this amplifier works and why it's been chosen instead of something simpler, such as two inverting or non-inverting op-amps. What can see ...
- 701
75
votes
8
answers
26k
views
Reasons not to use a 741 op-amp?
Simple enough question. Why not use a 741 op-amp in a target circuit or anyone's target circuit? What are the reasons not to use it? What might be the reasons to still choose this part?
- 465k
1
vote
1
answer
178
views
Why does an diff-amp being fed by two separate op-amps with low input resistances distort the signal on the inverting input?
I'm using the following circuit. In1 and In2 come from two separate amplifiers (Max9643), both of which are fed by a square pulse but have their inverting and non-inverting terminals criss-crossed ...
- 11
0
votes
1
answer
212
views
Noises generated by OpAmp driving 50 ohm load
I am trying to drive a 50 ohm with 300mV, 15khz sine wave using an OpAmp. The chip I am using is ADA4610.
However, I found that there are noises of 15kHz(4mV Vpp) and 30kHz(3mV Vpp) at the power ...
- 1,622
1
vote
2
answers
644
views
Why does a Schmitt trigger work in saturation region?
Given this circuit
simulate this circuit – Schematic created using CircuitLab
I am trying to prove that the opamp works in saturation region as instructed in the first answer to this question :...
- 245