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141 linear-regulator questions.

I've got a component within a larger device that requires both +15 and -15V, drawing about 100mA per rail. In addition, the main power supply of the larger device is providing +/- 28V, with a common ...

What is the best and popular LDO regulator for 2.8 V output supply? Our requirement is to constantly supply a 2.8-3.0 V from a Li-ion battery (3.7 V 2500 mAh), to an Xbee device and the current ...

I'm using a 12V adapter and a 2S 7.4V Li-ion battery to power my electronics, and I would also like to power my MCU with it. To switch between the adapter and battery I'm using a BQ24133 from TI. I ...

I have searched the Internet but didn't find one, can anybody please suggest me any regulator ic that is 12 or 14 volts and can bear upto 100 amps.

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 ...

Given a step change in the input voltage of a standard op-amp based linear regulator, a finite amount of time is needed for the op-amp to sense the voltage difference at its input and do whatever it ...

I'm really sorry for the noobly formulated question, if I knew how to formulate it I'd probably find what I need by searching, this has to have been asked and dealt with many times. I've been using ...

With the circuit setup shown below, if I have available a type of Q2 transistor with a certain maximum dissipated power and need that D1 withstands a large current that would lead Q2 in trouble, it is ...

I am figuring out the schematic of an existing e-bike controller. Specifically I am trying to replace an lm317t with a custom made switch regulator that outputs the same voltage. But first I want to ...

I'm in need of a stable 12V 1.5A power which I could carry with myself. One way of doing it would be to strap, say, 12x 1.2V rechargeable batteries and use LM317. But then I read about buck ...

I'm trying to reverse engineer a broken control box for some dual intensity motorcycle LED spotlights, and I note on the circuit board there is an AX 3007-50 12V ...

Could I use two L7812 voltage regulator ICs in parallel to get 12 volt and more current that with just one?

I share the picture of the schematic of my circuit. I want to use the LM350 variable voltage regulator to reduce the 40mV p-p ripple i have in my bridge rectified DC. Though it has no effect at ...

I've been trying to find ways to drive an N-Channel MOSFET gate higher than the power rail in order to make use of the full supply available. The MOSFET needs to operate in the linear region using an ...

I would like to understand the meaning / function of the transistor on LM317 ADJ pin on the following circuit. Image source

I'm building a dual-rail power supply and need to drop about 5-10 V from the rectification output. It's for powering an amp so I need low noise and about 2A therefore I opted for linear regulators. ...

I made a circuit where I needed DC 8v supply. I was using a KA7808 to regulate the voltage. While testing the voltage regulator unit, I identified that the Regulator IC might be faulty because I was ...

I designed a circuit for a high current linear regulator (20A peak, 16.4V (max) input regulated to 13.8V) using a Micrel MIC5158 together with a BUK9575-55A. The 20 A peaks are short, since the use is ...

Just a quick question. is this a correct circuit? would it drive 500mA device? given using AMS1117 as the regulator? Do we need to add heatsink? any alternative to step down the 12V to 3.3V without ...

I am trying to control a wheeled inverted pendulum with a PID controller. I already designed a linear quadratic regulator (LQR) and a pole placement regulator (PPR). I would like to design a PID ...

I use a 7805 for a project where the circuit needs a higher current (~2.8 A) at 5 V. So I assume that if I use both ICs in parallel I can increase the maximum current capacity. Would it work?...

A friend asked me to make a simple regulator for a high current load: a 13.8+-15% V, 20 A (a radio). The input is a 13.5-16.8 V LiPo 4S pack. Obviously, the pack cannot be discharged completely. Still,...

I am trying to run an IC with an absolute maximum voltage spec of 3.6 V. The linear voltage regulator that feeds the whole board specifies a maximum output voltage of 3.63 V. For a given input current ...

I try to design a lab power supply with a DC/DC preregulator(for now LTC3646), and linear regulator(LT3080). I found a really clever hack that sets voltage produced on the preregulator to voltage set ...

I have 2 questions: Is it possible to generate -35V from LM337 regulator with -12V in input?? The voltage output from LM337 is supposed to follow this equation, -Vout=-1.25(1+R2/R1)+Iadj.R2 but in ...

LT3080 documentation states under absolute maximum ratings: SET Pin Voltage (Relative to OUT) ±0.3V (http://cds.linear.com/docs/en/datasheet/3080fc.pdf page 2) In the documentation there's also ...

I needed a current sink for something and I arranged one with LM317T: simulate this circuit – Schematic created using CircuitLab It has a switch to select whether I want to sink 100mA or 500mA ...

Apologies as I have very basic electronics background, and after searching for a whole afternoon I couldn't find out how to implement a circuitry that has this behavior as shown in the graph. If ...

Folks, Hopefully this is the right place to ask this. I'm a software engineer with VERY limited EE experience and am trying to learn. At the moment, I've got a project that I'm trying to power using a ...

I need to have a 5v supply with around an amp of current draw max, and a 6v supply with around a 4amps current draw max. I was thinking: instead of having two switching regulator circuits, just having ...

I have understood that you can create a linear regulator using a high-current BJT power transistor in the emitter follower configuration and one operational amplifier (and a voltage reference, which ...

I have been trying to assemble a simple 5V regulator circuit using the L7805CV and have had no luck at all getting the output to 5V. I have tried many circuits and multiple L7805CV regulators, ...

I would like to know how a 78xx series linear regulator can be used in a switching application. I have found a circuit that shows such a use, but I have trouble understanding how the circuit ...

I am designing a circuit containing two Atmega328p. First chip will drive TFT screen with 3.3 V linear voltage reg. Second one will drive BT module, couple of relays, two sensors, SD card module, and ...

This is a description of LDO in Switch-Mode Power Supplies Spice Simulations and Practical Designs by Christophe Basso. I am wondering if there is any mistake here. The author said that for linear ...

I am feeding an arduino, presently through its Vin pin, with a 0.9V drop on its onboard regulatorZ I'd of course like to feed it via its 5V pin, which has a strict upper limit of 5.5V. I don't have ...

I'm trying to make a constant current source of 2.1A which will operate around 1.7V. I did some web searching, and I decided to use linear voltage regulators; simply put a adjusting resistor between ...

Currently I am doing a project on a voltage regulator. Can you tell me some advantages of MOSFETs over BJT? Apart from a higher power loss, I can not find much. In control engineering it is much more ...

I am building a USB mobile charger powered by manually rotating a 12V DC motor shaft. This voltage goes as an input to a LM7805 voltage regulator and the output of the voltage regulator is used to ...

For my internship, I am tasked to design a power supply whose main purpose will be to power a 90 Vdc motor. The motor is used for a short amount of time (roughly 30 seconds), pulling about 1 A during ...

My LM350 regulator with smoothing caps (C1:0.33uF, C2:1uF polarized, R1:150 R2:10ohms+trimpot) does not work. It works without capacitors. I am an idiot. What have I done wrong? I tested all the ...

I am still learning analog electronics and possibly making a mistake here. I am trying to build this power supply circuit but I am getting 0V as output instead of 4V. This is the schematic Both of ...

I've been analyzing the schematic for an old commercial linear power supply, the Farnell LT30/2 (schematic). The schematic contains a couple of examples of an op amp arrangement that seems very ...

Computer science & math major here. I'm designing a linear power supply to introduce myself to electronics. To keep things cool and cheap, I am trying to limit the amount of power dissipated in ...

I want to design a variable voltage regulator that will get from it`s maximum output (lets say 10V) down to 0V (or very close) considering the input as regulated 12V (from a PC power supply). All the ...

I am designing a circuit that uses an LDO to produce 3.3v from a 10 to 18v input. I sometimes will need 1.2 amps from this regulator and at other times I only need microamps. When I need even less I ...

I am looking at this simplified schematic for a linear regulator. The way this works is the error amplifier drives the base of the power transistor through the current amp. This in turn varies Vce to ...

I have to do a DC DC conversion from 36V to 32V @1.5A. I found some switching regulators, but no linear regulators. I'm not sure using a switching regulator is the best solution (price, overkill, ...

I am in the process of designing a lab power supply for myself as a learning opportunity. However, I have hit a road block in my design. I am trying to use a single Vishay IRF520 mosfet as a DIY ...

How would this behave in real life? When I simulate it, I get stepped voltages across the LVRs and odd output voltages. simulate this circuit – Schematic created using CircuitLab

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