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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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High Side MOSFET Driver

I am familiar with the bootstrap circuit and its design procedure. The steps involve: a) Figure out the Qg of the MOSFET at the Vgs you plan to operate (for instance Vgs=15V, Qg=150nC). Next, figure ...
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99 views

TPS63070 Buck-boost getting wrong output voltage

I am using TPS63070 buck-boost regulator and I would like to get 4.7V output at TP12 but I am getting 11v which is wrong and don't know why. (Input voltage is around 5.8v, but could vary between 4.7 -...
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106 views

RTC Power Switch for Raspberry Pi

I have done a lot of research on how to design a circuit to cut power from the pi after a safe shutdown and then turn it back on at a certain time. I am using a DS3231 RTC with an active low ALARM pin ...
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36 views

Boosting voltage to power a solenoid (pulsing intermittantly)

I would like feedback on the following circuit design please. I am powering a solenoid using a 3S LiPo battery but want to increase the voltage to 35v. I am using an XL6009 module to boost the ...
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61 views

LM350 voltage rises with capacitor

I'm really trying to understand my voltage regulator (LM350T), but I think I'm still missing a few things. If I add cap C3 (I've tried 0.1uF and 10uF) to the output in the circuit below (note that the ...
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30 views

Reactive power compensation through grid connected inverter

I recently designed a bidirectional DC-DC charger for an Electric Vehicle (EV) battery. I would like to focus on the inverter control. In this application, I designed the inverter to have unitary ...
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98 views

Simple solar panel + supercap powered arduino

Long version (full story, so skip and go direct to questions below if you want to): I have small arduino mini pro board powered by 230mAh Lithium coin battery used as wireless sensor (with NRF24L01 ...
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25 views

Problem getting data code of Regulator

i wann change a Regulator of a mini Thermal Printer EM205 "GOOJPRT" but i don't get the equivalent-number of the Regulator (A7y77), cann somebody help me ? Packegetyp : SOT89 or SC62 Thanks a lot
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Has anyone else had issues using an LT1761 regulator?

I've designed a circuit and I needed to use low noise regulators. The regulator that I chose for my positive rail is the LT1761-5, the 5V fixed output version of the regulator. I put 6V in and I haven'...
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43 views

Voltage increase on regulator load

I have a simple adjustable power supply (1.8V - 16V / <1A) that I put together with an LM350, works great for the various small bench-top things I use it for. Typically on a load being applied, I ...
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33 views

How to find and compare two regulators' output impedances

I want to compare output impedance of TL780-05 and LM7805, and also AC output impedance. Which parameter indicates these? Both are fixed 5V regulators. I can only see that one of them has 1% ...
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Combine 2 power supply with a buck regulator [on hold]

I want to create a solar-wind energy combination for demonstration purpose for student, with criteria: be simple (no mppt, no complicated circuit), can combine 2 sources, can turn off 1 source using ...
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46 views

What is Vrect in a Voltage Regulator?

I'm just reading through Texas Instruments' Application Report on Switching Regulator Fundamentals and came across the half-bridge converter and the formula for both the output voltage of the entire ...
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74 views

I need to know what this component is [duplicate]

I have a tester of CCTV cameras that indicates this component is failing and overheating and when connected to a load. The equipment does not work but power is consumed. After reviewing it ...
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22 views

Powering on ESC causes backfeeding on PWM line

This question is on behalf of the robotics team I am a part of. Our robot's electrical system has been working great. However, we noticed that once in a while our Teensy or Raspberry PI would crash ...
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46 views

Buck-converter dynamic output-voltage using digital-potentiometer

I am driving a load at 40 V, 4.8 A, and would like to dynamically change the voltage being supplied to it, ideally creating a 2-40 V range with increments of <0.1 V. To achieve this, I am thinking ...
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42 views

reduce 5 volts to 3.3 volts with 1 ampere current [on hold]

I need to convert 5v to 3.3v with a current requirement of 1 to 2 A. i reckon that i should use LDO and not buck converters. i need an elaborate and specific answer regarding the components which ...
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42 views

Cheap USB controlled DC voltage [closed]

Right now I'm using National Instruments DAQ boards, but I need to put together a few devices that require software control of a DC voltage in the 0-5v range. Update rate can be less than 1 Hz and 8 ...
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46 views

About Ac to DC convertor..? [closed]

Which is the best way to convert Ac to DC , with maximum efficiency possible by using a transformer. The required voltage is 5v and current is 1a . I saw a circuit from my mobile phone charger they ...
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59 views

Using a slider switch to turn on a regulator with on/off

I have a voltage source that will be either 3.7v, 5v or 12v and would like to use a 6v 300mA rated switch to turn the power on and off by using the on/off pin on a MC33375D regulator. Would ...
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44 views

Can someone help me design a circuit that will open when power is applied and close after power is removed?

I am using an air conditioner thermostat transformer which provides power to my circuit. When the thermostat powers up, the door opens. I want the door to remain open until the thermostat shuts off, ...
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50 views

High voltage to low voltage buck converter for(60V IN 5V 3A out) making noises?

I've been trying to convert a high voltage input to a lower voltage (5V at around 3A) with no luck using these Modules and all of the LM2596HV iteretions of modules out there and all seem to make ...
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88 views

How is the voltage regulator functioning in this vintage charging circuit?

Attached is a simplified diagram of my motorcycle's charging circuit. It has a standard 3-phase bridge rectifier circuit--simple enough. I'm confused about two things: (1) How is the voltage ...
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42 views

Voltage Rectifier Fails When Doorbell Button Shorts Inputs [duplicate]

I am working on a project that involves powering a 3.3V microcontroller off a doorbell transformer. The design uses a full-wave bridge rectifier (1) to convert the AC voltage from the doorbell ...
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408 views

is a voltage regulator required for atmega328p when powering from boost converter at a set voltage?

I know that linear voltage regulators are more accurate at holding the required voltage but the boost converter i am using seems to keep a pretty steady one. the voltage will of course be within the ...
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1answer
24 views

voltage regulator using L7805CV from Centre Tapped Transformer

I have a 28V-0-28V, 7Amps centre tapped transformer to supply voltage to my load. Load will be a cell (plates are connected in both series and parralel) used in Chlorinator. I have a voltage regulator ...
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137 views

Voltage regulator with heatsink gets overheated

First of, I'm sorry if I'm using the wrong terms or if I'm pointing out something that is obvious to most, this is not my profession, it's only a hobby. I have an input voltage of 12V 5A which is ...
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76 views

Adapating a single cell Li-ion battery voltage to 3.3V low power application

I'm planning to use a single cell Li-ion battery to power up a custom made circuit. I'm planning on using a ESP-12E module board as the application will need to connect every once in a while to ...
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58 views

Wall-warts dont work with fixed regulator?

I have a circuit that uses a couple of fixed regulators (AZ1117E) for 5v and 3.3v, it doesn't work with any wall-wart thus far but works fine with a 12v PSU, (all wall-warts I used were 12v). When I ...
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1answer
79 views

Trouble Powering Microcontroller from Doorbell Transformer

I am working on a project that involves an IoT device, with a 3.3V microcontroller, powered from a doorbell transformer. In an earlier question, I was attempting to solve an issue with a bridge ...
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21 views

1W*3 3W*1 Power LED Driver Circuit Power Management

I'm trying to interface 4 Power LEDs to be driven by a 3400mAh Li-Ion Battery by using 5 AMC7135. To control the battery I've hooked up TI's BQ25606 as Power Management whose input will be from a 12V ...
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40 views

Charging lead acid battery using LM317 and PB137 in series

simulate this circuit – Schematic created using CircuitLab I am making an Uninterruptible power supply (UPS), to power some data logging equipment (requires a supply V of 10-30V DC). I have an ...
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164 views

I don't fully understand Amps

I am a hobbist in electronics, meaning I don't have any really training on electronics. Anything I know about electronics is read from books, YouTube or this site. I am trying to design a circuit ...
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35 views

SOT23 marking code SPR4

My search for the SPR4 lands me here but couldn't find a definitive answer. I'm leaning towards SP but that is pointing me to BSS84. The designation on the board is "Uxx" while others are 'Qxx". Thank ...
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134 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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216 views

Why my Buck converter is undergoing smoke and fire

I am new to electrical. I am powering my router from 24V battery. But power requirement of router is 12V/1A. So I am using LM2596 buck converter. The specification for this buck converter is as ...
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64 views

Lead Acid battery switching regulator to keep constant output

I am trying to use this ups design(below image)(max 500mA) but I want to use switching regulator instead of linear regulator to keep regulated Vout as constant possible even when battery drop below ...
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25 views

Controlling two DC brushed motors, 12V and 2.4V, limiting current while also supplying logic circuit

I have a system which is going to employ two DC brushed motors. The main power supply supplies 12V and is rated for 3A. I'm attempting to maximize the available current to each motor. The smaller of ...
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2answers
39 views

Car battery(12v) to 7v 2a (to power fan controller)

I recently installed an amplifier and sub woofer in my car and it is gets up to 40C where I live so my amp gets VERY hot. I want to build a box/amp rack for the amp which will have fans on each side ...
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70 views

Uninterrupted power supply with auto shutdown lead Acid Battery

Bellow circuit is an uninterrupted power supply(4.7 Vout after regulator) with auto shutdown when the battery is low. I am using a 6-volt lead acid battery with 9v charger. I am looking for an Idea ...
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98 views

LM317 Vout drops on load

I built a very basic circuit to get around 5.5V from a +15V source I have a 220 Ohm between Adj and Vout and one 470 Ohm, one 220 Ohm and two 100 Ohm in parallel between Gnd and Adj summing up to ...
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93 views

What is a simple voltage limiting circuit?

I am searching for a neat solution for an input voltage limiting circuit. Situation: I have a circuit with an input voltage range from 6 V to 20 V at 3 A peak (the load), however my source can be ...
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46 views

Voltage regulator's input capacitor “Required if regulator is locate an appreciable distance from power supply filter.”

The datasheet of a 78XX voltage regulator states that the input capacitor is "Required if regulator is locate [sic!] an appreciable distance from power supply filter". What constitutes an "appreciable ...
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186 views

Is a regulator necessary?

Sorry for the provocative subject line. I was looking at using one of those integrated ESP32 + SX1276 + SSD1306 boards (there are a few that have popped up) in a battery powered application. I would ...
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1answer
67 views

Wrong value with LM2937

I designed a PCB accoridng to the schematic above and here is the PCB: It's not working as it' supposed to be. After LM2937ET-10 (package SOT-223), I'm supposed to get +10 between pin 3 and pin 2 of ...
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98 views

Circuit design with multiple voltage levels

I'm working on an art piece based around an Arduino Mega that essentially requires power for three types of devices: Solenoids (4): 24 V, ~100 mA a piece (400 mA, 9.6 W total) NeoPixel LEDs (1280): 5 ...
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2answers
35 views

How would you regulate/use 60V/1A or 12V/100mA to get ESP's 3.3V/~300mA?

I have a device with two possible output pins with max. rating 60V/1A and 12V/100mA that I would like to connect to an ESP8266 (that sends notifications when ON). To keep it simple, I would connect it ...
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4answers
98 views

Can I use a 3.3V linear regulator to level shift a 5V square wave down to a 3.3V square wave?

I have an output of a comparator that is a 5V square wave. Can I feed that square wave into a 3.3V regulator to get a 3.3V square wave? The 3.3V regulator I have is the LP2950.
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47 views

Testing voltage regulator with load

Hi I want to test an MP1584EN voltage regulator. I supplied 12V and I want to turn to 4V The specs say that I can't use that without load (I don't want to use the real load because I don't want to ...
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2answers
58 views

High power LED array

I’m designing SLA 3D printer and I need to design UV LED array for LCD screen backlight. Preliminary design is 5x3 (5 parallel lines with three LEDs in each). All LEDs will be soldered on PCB. The ...