Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
0answers
43 views

How to find correct MOSFET for 100 V to 12 V DC converter

I have a converter which convert max 72 V to 12 V, but my input is 100 V so I need to change MOSFET. How to find correct MOSFET which can support input 100 V? Current MOSFET does not support 100 V. ...
0
votes
1answer
33 views

I have a certain 9v device and I want to connect it to the same power input as my ESP32

I have the parts listed below. Sending a distress signal should be easy because there is a relay. However I can't figure out a good way to power them both due to the voltage difference. I tried 2x 9v ...
0
votes
1answer
32 views

Adjustable voltage source 10 – 50 V and adjustable current limiter 2 – 70 mA

I would like to build a source that gives on the output an adjustable voltage from 10 V to 50 V and that current be limited from 2 mA to 70 mA or make some circuit that let me choose 2 mA, 1 0mA, 50 ...
0
votes
1answer
60 views

Vary the Vpp of sinusoidal oscillator

For an assignment I have to create a sinusoidal oscillator with 5 Vpp (centered around 0 V) oscillating at 10.0 kHz. The oscillator works as expected, at the right frequency, but the voltage needs to ...
0
votes
2answers
67 views

RIght reasons for using a voltage regulator for DC motors

I read in an online book at https://www.learncse.com/images/Lessons/Lesson_14.pdf following reason for using a voltage regulator to power DC motors. While I understand the importance of using a ...
3
votes
2answers
58 views

High Voltage Regulator

I have built a valve/tube tester. To provide the various screen and plate voltages I'm doing this: The required voltage is selected by a rotary switch down the stack of zeners. The momentary button ...
0
votes
0answers
70 views

Voltage controlled voltage regulator?

I have a voltage that's used to dim a 12V bulb and I'd like to use it to dim an LED instead. My plan so far is to use a triangle generator and a comparator to make a PWM signal with varying duty cycle....
1
vote
1answer
48 views

Using an analog voltmeter to display the changes in out put made by a dimmer switch for a light

I'd like to preface by saying k know little to nothing about electrical engineer but would like help with making a lamp. I want to use a volt meter style gauge to display a different reading for a ...
0
votes
2answers
49 views

Is this a suitable Voltage Regulator to replace an old circuit on my board and is my logic correct?

I have 4 of these 2n3904 transistor setups on my board: A1 -- requires 5v on these 2 connected pins to be enabled. I control this by driving r2 high at 3.3v which should allow 5v to flow through the ...
0
votes
1answer
15 views

CL8800: how RC bridge regulate the tap current?

As in CL8800 datasheet, page 8, the document refers to simplified block diagram (Figure 3-6) How do I calculate the value or R_SET for controlling the amount of current in each tap? What is the ...
0
votes
1answer
89 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. ...
0
votes
2answers
76 views

How to diagnose transformer failure or expected output

I have a pcb that takes 5v from a main board on pins 3&6 and takes this current through the T1 Transformer (obsolete, no datasheet S1673305) and should output some voltage (service manual does not ...
1
vote
3answers
82 views

How big does ground need to be? Step down from 5v10a to 1.2V 50a, do I need a 50 amp ground?

I'm just a layman. I was just thinking about CPUs in computers. They run at about 1, 1.5 volts or there about, sometimes even lower. Desktop cpus can take 90 watts, some 120 watts. That's close to 100 ...
1
vote
2answers
56 views

Choosing inductor and capacitor for boost converter

I am working on a IoT project that involves an arduino and a 4G LTE module. The device will be operated with two Alkaline batteries. Both the arduino and LTE module require 3.3V input so I want to ...
-1
votes
1answer
31 views

High Output Current with Short Circuit Protection KA7824 Regulator [closed]

I have a circuit board with the following set up with the voltage regulator KA7824 This picture is taken from the datasheet of the voltage regulator as one of its uses. my circuit board converts AC ...
1
vote
2answers
117 views

Multiple Step-Down Voltage Rails from a single DC Power Supply

I have one working PCB which has three different Voltage Rails: 3.3V, 4V and ...
0
votes
0answers
26 views

Alternative to Microchip LR8 High Voltage Linear Regulator

I'm part of a Formula Student (FSAE/FSUK) team which is a global competition that runs every year in which each university designs and builds a racing car. We're in the electric vehicle category. As ...
1
vote
1answer
29 views

Help with supplying 3.3v to ESP and temperature/humidity sensor

I'm new to electronics. I've built this: It's an ESP-01 Wifi chip and a DHT22 temperature/humidity sensor. Now I'd like to power it with batteries instead of an Arduino. The ESP-01 requires 215 mA, ...
3
votes
4answers
141 views

Linear Regulator PCB placement

I'm designing a PCB with some noise-sensitive components (FPGA, RF mixer, etc.). For the power systems I've decided to chain switching regulators to LDO regulators so that I get less heat dissipation ...
-1
votes
2answers
60 views

Capacitor for 5V to 3.3V on AMS1117 voltage regulator? [duplicate]

I have ESP32 with several modules attached which require 1A 3.3V. I am planning to use 5V 3A power supply which then step down to 3.3V with AMS1117. How large capacitor need to stabilize AMS1117 ...
0
votes
0answers
54 views

Can I bypass the LDO regulator on a Wemos D1 mini esp8266 board

I have found a couple of entries on this site but I can't apply the answers to my particular situation. I tried this option Power Wemos D1 mini from battery but it doesn't take long for 3xAA ...
0
votes
3answers
66 views

How to make a fan speed regulator with a pot and a voltage regulator?

I want to make a simple fan speed regulator, but my electronic skills are failing me. I want to be able to slow down two computer fans. I have in my hands a 12V/1A power suply, 2x 12V/0.2A fans, a ...
1
vote
3answers
156 views

H-bridge with 7815 regulator

Could anyone explain to me why my 7815 regulator gets hot and eventually blows up ??
2
votes
1answer
59 views

Why are both a voltage regulator and 2 MOSFETs used for a 3-5V to 3.3V circuit?

I'm adapting a breakout board for the LMS9DS1 IMU to suit my own needs. This breakout board has an input range of 3-5V and works on 3.3V. However, the circuit, as shown below, seems to have two ways ...
1
vote
1answer
53 views

0.5V virtual ground with single rail op amp

[EDIT] I am working on a 0.5~3.3V voltage source with 0.5V virtual ground. Any problem with the design so far? (The high side probably needs to be switched to a class AB amplifier as well) I am ...
0
votes
1answer
42 views

PI controlled linear voltage regulator with overcurrent protection

I designed a simple linear voltage regulator for high voltage application around 500V which is controlled by a PI controller. Schematic 1 shows the raw design using a bipolar transistor to control ...
0
votes
2answers
67 views

Converting 12v to smooth 5v?

I’m working on a motorcycle here. I have a 12v battery to work with and a stator that produces (limited) power. I have a throttle position sensor that I believe needs 5v input and outputs up to 5v. ...
0
votes
1answer
50 views

can I use Two Same Power supply sharing input in single circuit?

I currently have a circuit which consists of two different boards. In the main board, there is a \$230\,\mathrm{V}\$ ac supply, a \$230\,\mathrm{V}\$ to \$12\,\mathrm{V}\$ dc power supply, a 7805 ...
1
vote
0answers
36 views

Designing a +10 V -10 V +7 V DC power supply for audio equipment

I've recently purchased a tape recorder (Tascam Midistudio 644) that was very cheap because the previous owner had lost the power supply. The PS-M1 power supply that originally came with this unit is ...
0
votes
0answers
27 views

Voltage Regulator with Reverse Voltage

I have designed a simple PCB circuit board that is powered by either the 5V from a USB, or if a battery is plugged in, powered from a 3.3V and 5V regulator. I am no expert in electronics, but have ...
0
votes
1answer
44 views

12Vdc to 5Vdc @ 3A circuit

i'm trying to construct the following dc to dc converter. Input: 12Vdc 3A output: 5Vdc 3A but i'm getting no output, any ideas ?
1
vote
1answer
60 views

Please check my DC / DC schematic. ST1S40

I want to make a voltage down converter to power my controller (Atmega328P). Input = 12V / Output = 5V (3A). As a converter, I use ST1S40. My connection diagram I took the circuit from datasheet, ...
-1
votes
0answers
45 views

Why my 12 V zener is not performing avalanche breakdown as it should after passing 12 V voltage-level?

I need the exact 12 Volt or slightly below avalanche breakdown ... How can I achieve that?
5
votes
1answer
180 views

How to safely generate 200V from low voltage supply

Unfortunately, this post requires quite a bit of background if it's going to be useful to anybody (including me). I have been trying to build a relatively high voltage power converter for part of my ...
1
vote
1answer
57 views

Can I use same LDO for two outputs?

Can I use same LDO for two or three outputs? Given that the LDO provides enough needed current for three devices.
1
vote
0answers
29 views

Vacuum tube voltage regulator - capacitor on the output

I'm thinking about building a tube-based voltage regulator to provide the power for the screen grids of the output tubes. I have seen multiple designs of this and am currently thinking of doing it ...
-1
votes
0answers
27 views

Is it possible for a bad battery to burn out the controllers on my solar panel

I have between 22 and 29 volts coming out of the solar panel on a cloudy day; it been mostly cloudy around here lately. I'm charging one 12 volt marine battery and I have replaced the controller twice ...
0
votes
5answers
81 views

Does a transistor work by connecting the collector to emitter? If so, why do transistor regulators work?

I am wondering why a transistor, such as one used in this Zener diode + Transistor regulator , has the output controlled by the base voltage rather than the collector. My textbook (which has this ...
-1
votes
2answers
86 views

What is the correct way to control voltage on a mosfet

First Schematic with N-Mosfet simulate this circuit – Schematic created using CircuitLab simulate this circuit I have a few question on these design. First designed has been built on a bread ...
4
votes
4answers
924 views

Ways to power an Arduino from 24 VDC

I want to power an Arduino (Wemos D1 Mini) with 5 or 3.3 V from my garage door opener, which has 24 VDC available. As far as I understand, this can be solved in the following ways: Step down buck ...
-1
votes
1answer
46 views

Regulating High Power Wet-Cell Battery (Accumulator)

I'm currently working on long-term remote-sensing & data-acquisition. Thus, I'm planning on using 12V 45Ah wet cell battery (accumulator) for the supply. The system consists of microcontroller ...
0
votes
2answers
54 views

Help identifying replacement regulator

I'm doing some proactive maintenance on a vintage games console from the late 70s. There are a couple of linear regulators which I thought would be prudent to replace whilst I'm at it. Unfortunately ...
1
vote
1answer
45 views

Is it acceptable to replace 2 parallel 100uF capacitors for LM2596 with two 220uF capacitors

I have a printer motherboard with the LM2596 IC. The older version of the motherboard had one 100uF capacitor at the output pin of LM2596 but LM2596 recommends that 220uF be used. Because a cheap ...
14
votes
7answers
3k views

How make a dual +-12V supply from a 24V SMPS

I'm trying to power a home-made load cell transmitter using a 24V single SMPS. I need to make +12, 0 and -12 Volts that are capable of 50mA. I wish to power multiple channels of opamps and bridges. I ...
0
votes
1answer
79 views

Battery volt to 5 volt

I have two 3.7 volt batteries (I can use one or two) and I need 5 volts. Initially I thought to use the lm7805 but the circuit absorbs 4 amprere. how can I do? I need the component to be as small as ...
0
votes
2answers
57 views

Electrolytic capacitor at negative voltage regulator input

I'm trying to use a L7912 to output -12 V DC. The datasheet says to use a 2.2 uF tantalum capacitor on the input for stability. Further it says if an aluminum electrolytic cap is used, to have it at ...
0
votes
2answers
78 views

LTC3624 regulator won't regulate

I am using LTC3624-3.3 regulator, with components as in the datasheet app notes - 12 V Vin, burst mode, 10 uF at in, 47 uF at out, 2u2 inductor rated at 2.3 A... At no load, voltmeter says 3.34 V. ...
0
votes
0answers
23 views

Voltage Regulatoe in OrCAD Capture

I’m trying to find a L78S05C voltage regulator in pspice to model in OrCAD capture. I cannot find it in a library but I have the data sheet. How do I create this component from scratch using the ...
3
votes
1answer
83 views

What is a typical reverse recovery time for a zener diode, or is reverse recovery time not applicable to zener diodes?

A little background.. I'm trying to understand how zener diodes respond to high voltage transients. I stumbled across discussions of reverse recovery time and I'm curious how it applies specifically ...
0
votes
3answers
117 views

What are some of the reasons for voltage spikes in voltage regulated DC circuits?

Decoupling capacitors are often used to protect ICs against voltage spikes even in circuits that contain voltage regulation of some sort (even something as simple as a zener shunt) What causes ...