Questions tagged [voltage-regulator]

A voltage regulator is an analog circuit that produces a stable output voltage that doesn't vary with input voltage or load changes. Switching regulators are much more efficient than linear ones.

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In my dc to dc buck converter(0 to 17V - 12v), when i connect a load ,converter output voltage decreases to 1V [closed]

I try a buck converter of variable input(0 to 17) to 12V. when i connect a load with very small resistance , voltage decreases.if load increases , converter voltage looks constant. what happens if i ...
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Regulating voltage with low headroom

TLDR: what are the potential issues with boosting a 13V power source using a boost converter (6A) to say 16V, and then reducing it to 12V using a 6A step down regulator? I am trying to power a 12V ...
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WS2812b interference and bootup behavior

TL;DR: how can a slowly rising power supply voltage on an arduino crash the WS2812bs connected to it? How can I protect a signal wire even better from electrical interference? This my question in a ...
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LM317 VS AMS1117 as Constant Current Limiter for LED SMD Boards

i need to design some board like this: each led is SMD 5730 type with current max 150mA in three line and input voltage almost 3.2×7~23V, to create some SMD led board like this: so i have seen this ...
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PSU Modification

I have a salvaged hp printer psu with 31v output which is not that useful, upon inspection I found it has uc3842 ic, My guess is that it regulates output voltage using that pc817 optocoupler and a 7....
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97 views

Simpler ways to develop a buck regulator

I am designing a low profile space grade buck regulator. I have the following constraints ICs must be space grade Low component count Small size The converter specifications are as follows. Input ...
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28 views

How can a AC source be regulated to specific DC

Currently I am trying to power an Arduino project with a mechanical battery. I am using a stepper motor (NEMA23) as generator for it only needs low RPM to reach full potential (Around 600 RPM). Output ...
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66 views

Circuit Analysis with an LED

I want to design a simple circuit with a 9V Alkaline Battery (it currently have only 6.80V), a Voltage Regulator (uA7805C), a Blue LED (151051BS04000 from Wurth Electronik) and a current limiting ...
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93 views

What is maximum and minimum current through zener diode?

For a simple electronic voltage regulator using Zener diode, I use the following circuit. For deciding Rs and RL, I need to know Izmax and Izmin of the zener diode 1N4736A used. From this data sheet, ...
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64 views

Buck converter or regulator

I have a battery supply consisting of 3 AA batteries of each 1.5V. I need an operating voltage of 3.3V. Which choice of buck converter or regulator would be better? My application requires 100mA of ...
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44 views

Ripple voltage for LDO

I would like to understand how to calculate the ripple voltage of an LDO. Suppose I don't have an electrolytic capacitor. I have a 3.3V output loaded with 50mA max with a ceramic output capacitor of ...
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124 views

Charging part reccomendations

Ive started a project that I think has become over my head. But now that im into it I'm determined to learn what I can. This started as a 5v project but has become a 9v one. This project is to be ...
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28 views

voltage differential vs max input of regulator?

so im trying to assemble a circuit to take my 120VAC wall line and ultimately power a small smart hub, small transformer i found somewhere that was actually labeled with which pins were input/output, ...
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61 views

Advice on generating a negative supply rail (-5V) in an embedded, mixed signal design

I'm designing a board that can take an input DC supply of between +8 and +36V DC (+12V nominally) and needs rails of +5V, +3.3V, +2.5V and +1.8V. My current design uses a step-down regulator (LMR23625)...
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DG panel does not shows Line voltage, Frequency and RPM on load [closed]

DG panel displays 0 in Line Voltage, Frequency and RPM when i give load. But its every thing normal after i cut the load. Dg Specs are : Rpm: 1500 Freq: 50hz Line Voltage: 412v Phase V: 240v 62.5 kVA ...
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How to cut off power supply if Input voltage is greater than 12Vdc and less than 7.2 Vdc

I need help here is the diagram that I followed. In this diagram, the supply will cut off if the Vin is less than 6.5Vdc. Now I want to cut off if the supply voltage is less than 7.2V and greater than ...
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28 views

Regulated Low voltage signal creator

I am trying to mimick a sensor on a car that supplies 0.7 V to the car’s computer. So what I would like is a circuit diagram to build a unit that would use the 11 to 14 V input from the car battery ...
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171 views

AC to DC power supply using full wave rectifier with 4 outputs

I simulated the circuit below with multisim and got the required values. [![enter image description here][2]][2] 1.25 to 22V using the poistive regulator -1.25V TO -22V using the negative ...
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2answers
61 views

Do I need power supply totalling my current needs to maximum of my current needs?

My prototype project has these 3 components currently: US-17HS4401 stepper motor, rated at 12V / 1.7A MIG-400 6V DC motor, 6V / 10A max (although it was spinning fast enough at 3.75A) Particle ...
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65 views

22uF 0805 SMD capacitor for voltage regulator?

I'm trying to use some part of this circuit dual power supply circuit: http://embedded-lab.com/blog/multi-purpose-dual-power-supply-5-0v-and-3-3v-regulator-board/ Credits to embedded-lab.com. I ...
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70 views

How to provide a 5 volt rail from 24 volt source

Edit: Added practical observations at bottom. I need to provide power to an ESP8266 12E NodeMCU board, and my "raw" power is a 24 volt "wall-wart" PSU. My first thought was just to use a 7805 with a ...
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402 views

Regulating Negative Voltage

Can the TL783 be used to regulate negative voltage by connecting the output to my system ground and using the regulator ground as my negative voltage source? I couldn't find anything in the datasheet ...
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1answer
35 views

Residual AC voltage after diode bridge in dual power supply

I'm building a +/-24V supply for my first hifi project but I'm having an issue. I use a dual output 28V toroid, doubled P600M diodes for rectifying (to distibute the load and lower heating), with two ...
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Toggle between 1.5V and 5V Supply for MQ7 CO Sensor

I am interfacing MQ7 gas sensor https://www.sparkfun.com/products/9403 with esp32. MQ7 is a carbon monoxide sensor which requires two cycles to work. It requires 90 seconds cycle to release absorbed ...
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Micropower voltage regulator with discrete components

Overview I have an unregulated power source (photodiodes BPW34) from which I want to get a regulated voltage output 1V. My load consumes less than 10 microamps of current at 1 V. Constraints: I'm ...
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243 views

Feeding microcontroller and linear actuators (motors) with the same power supply

I have already made a diagram using a motor controller. The details of the actuators are: Input voltage: 12VDC Max Load: 750N(168.607lbs) Stroke Length: 16 inch Travel Speed: 12mm/s Duty Cyle: 25%. ...
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1answer
59 views

Will this LM317 Circuit work for my application?

I am attempting to design a circuit to charge lithium 18650 batteries is a 3S configuration. I understand that a BMS is recommended, but I am not concerned with that. I have built this LM317 circuit (...
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53 views

SSP1117-5.0V Fin connected?

I'm looking into the SSP1117-5.0V voltage regulator, but can't find if Fin is connected to any other pin.
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262 views

How to reduce voltage with no earth?

I'm currently working with raspberry pi's that are going to be powered through an LED night light (its for being able to observe people working on experiments and giving light to the camera) and in ...
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77 views

5V Linear Regulator outputting Vin-1V

I designed a control circuit for a camera system. Most of the circuit works but except for a 5V regulator that outputs Vin-1V approximately. I checked 2 different ones on 2 different boards and both ...
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2answers
918 views

Making A USB Charge Cable (to replace 2.4V power supply) - Buck Converter?

I have battery-powered hair clippers that charge with a 2.4V 2000mA AC adapter. I'm looking for the best possible way to lighten or eliminate the adapter, as the one that was included is huge and ...
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139 views

varable speed on a 4.5v-12v dc hobby motor

How can I vary the speed of a 4.5v-12v dc hobby motor? This motor will run a set of conveyors to simulate a steel mill operation. The motor has small gears to run the conveyor, but i need to be able ...
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58 views

Voltage Regulator Poor PErformance

I am trying to use a voltage regulator to regulate a 12V, 2A DC Power supply down to ~5.2V with a load current of less than 0.5A. My schematic is as follows: Problem: the regulator is getting quite ...
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262 views

What is the idea behind the ingenious Widlar current limiter?

For a long time, I had the idea of this circuit as a short circuit protection. I first saw it in the output stages of the Widlar's 301 and Fullagar's 741 op-amps... and knew it was Widlar's invention. ...
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1answer
63 views

which kind of design of level shifter suitable for high frequency data transfeing in range of 1MHz? [closed]

A circuit needed to convert 3.3V and 5V logical voltage. However, the issue was that the circuit was supposed to handle very high data transfer at or above 1 MHz and up to 16MHz. I thought of ...
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1answer
49 views

LM338T voltage regulator output unstable and fluctuates

Hello guys sorry for my noob question, I have LM388T voltage regulator and i created a module that can supply multiple voltage for 5 components that needed to supplied, i replace potentiometer and use ...
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1answer
235 views

Resistor values on a 12v 10a circuit with LT3045 LDO

I am currently working on a project that aims to provide 12v 10a in the final output. I am quite new to EE and wasn't quite sure if I have choose the correct resistors value as highlighted in the ...
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2answers
46 views

Input Capacitance in LM 2596 Step Down voltage regulator

What is the significance of the input capacitance (680 uF) (uF = microFarad) at the input of the LM 2596 ? LM 2596 is step down voltage regulator. Please refer: http://www.ti.com/lit/ds/symlink/...
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63 views

AC to DC low power Converter

I am looking for low power power supply without transformer. Input \$110V-230V\$, Output plan to use 7805 regulator IC. Application demand \$5V/3.V, 150-250mA. \$ In input side I ...
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1answer
260 views

Simple current limiting regulator

I’m currently getting ready for an Electronic Systems Engineering exam, and going through past paper questions. I need help with a few questions regarding the following current limited regulator. ...
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5answers
83 views

If Voltage determines current , a transformer regulate current?

Well , a transformer can regulate the voltage , increasing and decreasing it . And , if the voltage increase , the current too . So... a transformer regulates current too right? Sorry if its a ...
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1answer
23 views

Can Qualcomm Quick Charge Charger Charge 3 18650 cells in series [closed]

Please may I ask : can quick charge charger charge batteries in series ? Say 3 series of 18650 batteries giving about 12.6 volts; can your quick charge adapter charge it just putting it in series ? ...
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3answers
100 views

Powering small DC load ( 1W ) using 220V AC supply

I am trying to design a small control circuit for controlling large currents (not too large, around 200W, AC 50Hz). I have kept in the AC circuit isolated from the DC control circuit. But the problem ...
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1answer
160 views

voltage level detection circuitry?

My previous question is way to off point so i deleted it. I have a designed circuit board that have a problem with its start up sequences. Basically, the problem is that the voltage ramp up (could be ...
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1answer
69 views

Can a AMS1117 fixed voltage regulator be used in a reverse biased way?

I was looking at a breadboard power module (link). This board has two inputs: a DC plug (7-12V advised) and a USB mini (5V). Using either of those two inputs, the board provides two voltages (3.3V and ...
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1answer
56 views

Voltage comparator

I have a circuit where I have to read high and low logic level through a micro-controller. Condition: When the input voltage is above 15V, it should be HIGH logic (2V to 5V.) When the input ...
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230VAC to 30VDC/6A power supply

I am working on a lab bench power supply capable of 30V at 5A. It is a linear PSU so therefore i will need 30VDC to feed into a regulator (5x LT3080 in parallel). I think that 1A is enough for the ...
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1k views

LTC3355 backup DC/DC regulator output voltage sags under load in boost mode

Background For a hobby project, I have designed a board using the LTC3355 DC/DC regulator to work as a power supply. I am a software engineer by trade, and I am thus totally underequipped to properly ...
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2answers
237 views

L7805CV - Circuit not pulling expected current when powering from Voltage regulator

I am using a linear regulator to step down the voltage for my microcontroller circuit, however, I noticed that when I power my microcontroller circuit from my laptop (at 5 volts) it pulls around 76 ...
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1answer
85 views

Step by step explanation of voltage regulator

Let's consider this basic scheme of voltage regulator (here the reference): I wanted to verify that a sudden variation of the output voltage is compensated by the circuit. Suppose that the output ...

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