The linear tag has no wiki summary.
1
vote
1answer
51 views
Designing stable PMOS voltage regulator
As a follow-on to the question "Using forward voltage drop of diodes with linear regulator" I am looking into designing PMOS voltage regulators.
General Topology
A common problem with the intuitive ...
2
votes
1answer
50 views
0V Adjustable LDO Adjustable Regulator
I'm currently researching LDO adjustable regulators to make an adjustable supply that runs from 5V. I want my supply to be capable of supplying down to 0V.
I've found the LT3083, which can adjust ...
0
votes
1answer
70 views
Reduce heating in linear power supply
I have a linear regulator in a product which works from 20 to 240VAC: a two stage linear regulator. Stage 1 converts to 18V and stage 2 to 5V. Stage 1 starts heating up as the input voltage increases ...
6
votes
1answer
181 views
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 ...
0
votes
1answer
106 views
When can a characteristic curve (here an amplifier) be considered linear?
I have built a difference amplifier and I have a pretty linear characteristic with a coefficient of determination of 0,9999478 (by a linear regression). Is it enough to say it's "pretty linear" (I ...
3
votes
2answers
373 views
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 ...
4
votes
2answers
307 views
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 ...
0
votes
0answers
227 views
How do you directly determine the approx. value of internal resistance of inductor in LC circuit
According to my calculation, it will take 0.005 seconds to charge this circuit to 8 Volts through the 50 ohms resistor.
Using $$ V_c = V_s(1-e^{-t/RC}) $$
How do you determine the effective ...
0
votes
2answers
286 views
RC Circuit, finding time it takes for Voltage across capacitor to rise from 0 to 5V
For the circuit shown below what is the time it takes for Vc to rise from 0 V to 5 V in (second). Assume Vc(0+) = 0 V
The answer is $$ t = 2ln 2$$ but I am unsure why.
What I have so far:
$$ ...
2
votes
2answers
529 views
Linear Circuit Analysis: Source Transformation
* source transformation is just a combining and rearranging voltage or current sources. I don't think its a universal term.
and I'm stuck. any hint?
7
votes
3answers
313 views
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 ...
3
votes
3answers
456 views
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 ...
2
votes
1answer
95 views
TO-3 Transistor replacement needed that does not protrude through the chassis
I have a linear power supply that uses two 2N3771G. They are TO-3 style, and are exposed outside the chassis, on the heatsink.
I need to move this power supply into a new chassis, for commercial ...
1
vote
3answers
358 views
Regulating a steam-powered model generator
In this age of questing for ever-more-efficient circuit designs, I have been presented with an anachronistic design problem: I need to keep a roughly constant load on a steam-powered turbine ...
4
votes
2answers
198 views
Linearized phase domain model of a PLL - what does a ratio of input phase over output phase mean?
I am trying to design a PLL and want to test it first in Matlab.
I have seen that the phase of the input and output are linearized, but I don't understand what is defined by the input/output phase.
...
1
vote
3answers
271 views
Budget alternative to fancy linear slide
I have been checking out nice 1D linear slides such as this and this and this.
Especially the first one is really nice since it has a built in encoder and a controller with RS232 interface. However, ...
5
votes
6answers
965 views
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 ...
8
votes
3answers
705 views
Best solution to get 3.3V from 5V-20V @ 250mA
For my Super OSD project, I need a +3.3V supply at 250mA from a variable input of 5.5V to 20V. Cost is a concern, as is size. Originally, I considered an LM317 in a SOT-223 package, due to the small ...
