Questions tagged [linear]
263 questions
74
votes
8 answers
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?
Andy aka
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17
votes
4 answers
Why do we need nonlinear electronics for computing?
When I read about photonics, I always see that they can be used for linear transformations (just matrix multiplications), and that this is a limitation that makes them unsuitable for building a complete photonic microprocessor. Why are linear…
egemen404
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16
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4 answers
Can a power MOSFET for switching application be used as a linear amplifier?
Power MOSFETs nowadays are ubiquitous and fairly cheap also at retail. In most datasheet I saw power MOSFETs are rated for switching, without mentioning any kind of linear applications.
I'd like to know whether these kinds of MOSFETs can be used…
LorenzoDonati4Ukraine-OnStrike
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13
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5 answers
Why is capacitor a linear element?
Why is a capacitor a linear device?
One property for linearity is that the capacitance or some such parameter must not change with voltage or current. Is this enough to make a device linear?
A few sources say that the \$Q=CU\$ has a linear…
Bhuvanesh Narayanan
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10
votes
4 answers
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 the negative supply rail, then, distortion is…
S.s.
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9
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7 answers
How to keep a linear regulator cool without an actual heatsink?
I want to use a linear regulator for some application, it's in a SOT-223 (not SOT-89) package. How do I keep it cool, preferably without a bulky heatsink? The regulator may be dissipating 2-3W of heat. I've heard that you can use copper traces under…
Thomas O
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8
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5 answers
Why does a multimeter show VAC on VDC power supply output?
I used my simple digital multimeter to measure the real output of several small PSU's I have got at home. They all should give just direct current and show some values in VDC mode, but the multimeter also shows nonzero values when positioned in VAC…
Al Kepp
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8
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4 answers
What's the difference between linear and audio tapers, and why should I care?
I'm stocking up on a variety of potentiometers to keep on hand for my audio projects, and I'm trying to figure out what to buy.
The projects I'm working on seen to call for either linear & audio taper pots. I know the difference between linear and…
dwwilson66
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7
votes
3 answers
About SPICE: Should I use transient analysis or DC linear analysis?
My question is specifically linked to an exam problem where I had to find a function in terms of time for the current on a capacitor and a resistor. The circuit was very simple: A current time-variant current source in series with 2 subcircuits,…
Severo Raz
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7
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3 answers
Where are small-signal differential amplifiers used?
I am teaching students about the differential pair (see circuit below). I addressed many issues like the difference between differential and common mode gain, taking arbitrary vb1 and vb2 signals and expressing them with common mode + differential…
DiscoLemonade
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7
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4 answers
Why is the linearity of a sensor a desirable feature?
I mean, a sensor can have a characteristics like Y=X^2 (X = the input, Y=the output).
That is, I can easily find X if I know Y.
Why is the linearity so important?
Hélène
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6
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4 answers
Why consider Linear Time-Invariant systems?
Okay this could be a very silly question but I am asking it anyway.
Why do we consider in most cases of signal processing that the system is Time-invariant?
Is it because most signals are linear and time-invariant or is there a more compelling…
Vineet Kaushik
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6
votes
1 answer
LM317 running digital pulses. Results are Noisy
The set up of my experiment so far:
A. I use a simple LM317 linear voltage regulator to supply constant voltage of +5V to Vdd of my Laser driver circuit.
B. Also I use another LM317 linear voltage regulator to supply voltage Vlda ( Up-to 12 volts…
Rene Duchamp
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5
votes
2 answers
How to stabilize a control loop for an opamp-based linear regulator?
I'm trying to build a digitally controlled linear bench power supply. The idea is to have a DAC that will output a low voltage (in my case it's 0-2.5V) and then scale it (let's say 0-25V for simplicity). And of course, buffer it with a big…
hjf
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5
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3 answers
Stabilizing opamps - am I doing it right?
I'm designing a high current linear regulator and learning about real opamps as opposed to ideal ones described in tutorials all over the net as I go.
My initial voltage regulation design was stable enough under the resistive load, but oscillated…
miceuz
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