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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Multiple Fixed output voltages with Voltage drop compensation [on hold]

I want to design a power supply with 5,6,9,12 V output capable of compensating up to 5V of drop ? Now designing the power supply part is fine but what about the voltage drop compensation, what all i ...
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34 views

L200 regulator power supply circuit design help!

So here is the thing, I'm far from an expert in electronics, I'am pretty good with following a schematic but not designing one. I have made a power supply based of the LM317 that worked out pretty ...
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2answers
48 views

Turn on a circuit only when current reaches 500mA [on hold]

I'm using small solar panels for charging mobile phones. I have two panels; each deliver approx. 19V 300mA. I used voltage regulators to each to get exactly 5V. Then they're connected in parallel. ...
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1answer
22 views

SW-Reg voltages at points

I am needing a variable positive and negative output voltage ~(0-20)V with a 20+V input. To handle this, I am using the LT1074. I am using the two configurations from page 13. To do this, I am ...
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36 views

Fixed ratio dc to dc converter with isolation [closed]

I am relatively new to electronics.I need to have a fixed ratio DC to DC converter with isolation in my design.(The ratio is approximately 6. For eg, 24 V input must output 4v). Is there a way to ...
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43 views

programmable AC voltage regulator

I have a testing setup where we have a manual voltage regulator that takes 230V AC input and outputs 50-230V AC. this goes then through a Power meter, then feeds a heating element. I use this to test ...
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1answer
55 views

What device to lower voltage for measuring purposes [closed]

What device would I need to take my 120V power at home and drop it several volts so I can test why a laptop, a printer and a camera I work with do not function? The problem manifesting is the laptop ...
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2answers
64 views

Step up converter - voltage drop on load

I decided to build step up regulator to power DHT22 (temperature sensor) from two AA bateries. The DHT22 needs 3V (or 3.3V acording to some datasheets) for operation. I picked up MCP1625 (from ...
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25 views

Multisim model for Linear Technology products

I want MultiSim model for LT3480 and LT4356DE. Can anyone help me in this regard? I tried searching for the these two devices, but could not find them.
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1answer
60 views

choosing a voltage regulator chip

I'm designing a schematic for a system that will utilize plug-in daughter boards. I'd like to provide the daughter boards with high quality 12V, 5V, 3.3V, and 1.2V, with up to 5A, available via pins ...
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28 views

L200 with NPN pass transistor help!

L200 datasheet: http://www.zen22142.zen.co.uk/Circuits/Power/l200.pdf In figure 24: There are two transistors, one BDW51 and one BC108. I was wondering what is the use of the second transistor ...
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26 views

24VAC Power Pack Peak to Peak or RMS Voltage? (For Split Rail Power Supply)

I'm designing a regulated, current limited split rail power supply for \$\pm12VDC\$ and was thinking of achieving this with a 24VAC input plug pack/wall wart. I implemented the power supply with ...
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2answers
57 views

Are charge pumps better than boost converters since charge pumps do not use inductors?

Charge pumps use capacitors and not inductors. https://en.wikipedia.org/wiki/Charge_pump Boost converters require inductors. https://en.wikipedia.org/wiki/Boost_converter Both charge pumps and boost ...
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45 views

Understanding Thermal Stability and Drift in Linear Regulators

I'm considering 3-terminal linear regulators (LM317, LM350, TL783, etc.) for a power supply that regulates a 150V wobbly DC voltage down to 145V or 140V. My load is like 30-65mA. So, depending on ...
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2answers
48 views

Buck Regulator Supply From Multiple Sources

Hey Electrical Engineerers! I am currently working on making an LED tail light for an older car. Overview of the Taillight Each tail light has 4 inputs connected to it: Park, Brake, Turn, and ...
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39 views

Single Buck Regulator for Multiple Circuits

Currently working on a project that involves 4 separate circuits that light up LEDs on one tail light PCB in an automotive application. Due to the high cost of a buck regulator circuit, we have ...
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3answers
53 views

Adjustable Voltage Regulator Resistor Values

I'm working with an adjustable voltage regulator and am having a hard time understanding my equation for determining resistor values. Datasheet: ...
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1answer
39 views

Quick question about the L200 circuit limit

I need some help on how to calculate the output current.. Datasheet: http://www.zen22142.zen.co.uk/Circuits/Power/l200.pdf I want to use the (Figure 2. Programmable Current Regulator.) But i don't ...
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1answer
25 views

3-Phase Permanent Magnet Alternator with Regulator/Rectifier (SCR) Output Waveform

So I've been troubleshooting some electrical problems with a motorcycle charging system, and I need a little assistance understanding the output waveform: Per an article (which I don't have enough ...
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1answer
25 views

Does a shunt regulator protect other ICs from high current transient spikes?

Does a shunt regulator like 431L (datasheet), wired like this (VKA is not connected to anything) help protect other electronics supplied from INPUT net (battery connection)? INPUT net also supplies ...
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1answer
124 views

Arduino and GSM Module running on Li-primary batteries for years

For one of our projects we need to run an Arduino board + GSM module (SIM800C for example) for many years on batteries without recharging. The Arduino should be in power down mode for 99,99% of the ...
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1answer
77 views

LM1117 3.3 outputs 0.65 V

I have a small circuit with an ESP8266, a DS18B20 temperature sensor and a DHT22. I prototyped everything on a breadboard, and it worked fine. I then moved to soldering everything. My input Vcc is 5v, ...
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28 views

PSpice Simulation of CE8301

I have been working on a project that requires me to boost 1V to 5V. I have found a ready-to-use boost regulator that gets the job done. The problem is that I need to get the circuit simulated on ...
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2answers
262 views

How to step up unregulated ~0.2-1V to regulated 5V

For a school project, I am building a small hydroelectric generator. It uses a 10v, 600RPM/v brushless Tower pro 3520-7t-8 motor, which, when geared up (I'll spare you the calculations here), should ...
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2answers
65 views

Voltage Clipping with Two Series-Opposing Zener Diodes

Theory Schematic for Voltage Clipping with Two Series-Opposing / Bidirectional Zener Diodes Consider the following schematic for voltage clipping with two series-opposing/bidirectional Zener Diodes ...
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23 views

Atx power supply typical load distribution

I'm designing a low voltage atx power supply. I need to know what load distribution is typical between the voltage levels of an average gaming pc. For example I know most of the power is used on on ...
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56 views

Voltage reference for an OCXO

I have a no-name OCXO with pins marked by seller (VCC, GND, RF OUT, Vadj). I have checked its output frequency against rubidium oscillator using the following method: I connected them both to ...
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2answers
98 views

What R, C values to use in an RC Snubber to reduce output ringing in switching regulator?

I am using a simple buck switching converter (AP3211) to convert 5V-12V to 3.3V. The issue I am trying to resolve is the output ringing. I see a 800mV P-P ringing on the output, with a frequency of ...
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5answers
137 views

7912 Voltage Regulator [closed]

So my senior project is due Thursday and because of my extreme wits and knowledge I accidentally connected A 7912 Voltage regulator the incorrect way because I was unwary of the different pin-out. I ...
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1answer
62 views

Analog sensor behaves different when power with USB and Battery

I am using this analog proximity sensor with esp8266 (07)The sensor requires 5V. Whenever I power it with USB the readings are just fine (steady), moving my hand towards it and away from it reads the ...
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1answer
62 views

How to build a DC-DC USB step up adjustable converter 2A? [closed]

I'm trying to find a reliable electronic diagram for a USB adjustable converter (5V~>6V~>9v~>12V). So what I'm tying to do is to use a powerbank (it doesn't have the off function is the draw is low) ...
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74 views

Decreasing Voltage of Power Supply via voltage regulator without using input/output capacitors

I have a HP laptop power supply 18.5V/3.5A that I intend to connect directly to LM7812 or LM7805 voltage regulator when I need to drop the voltage to 12V/5V. Since the laptop power supply (which is ...
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920 views

Why is there always a capacitor on input and output of a voltage regulator?

Looking at the datasheet I can see that the voltage regulators are not just a zenner diode inside, they are complex devices. I have noticed that there is always a capacitor at the input and another ...
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4answers
285 views

Regular (not Zener) Diode as Voltage Regulator

I see a lot of information regarding Zener diode voltage regulators but how about a regulator diode voltage regulator? What would be the potential drawbacks of using something like this: ...
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3answers
74 views

Zener Diode: Easing the load on a regulator

Summary: I am using a LM317 to drive a liquid pump that draws 1A. Unfortunately my regulator is dissipating way too much power and getting too hot. Currently my input voltage to the regulator is 12V ...
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1answer
63 views

Build own custom USB 'regulator' adapter board to solve Desktop boot hangs with KVM

My Desktop PC hangs in the BIOS boot phase when my KVM is attached. If I unplug the USB connecting the PC to the KVM, the PC boots without hanging. If the USB of the PC is connected directly to the ...
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1answer
18 views

AC voltage regulator in parallel

I have two voltage regulator which works on ac. They are both the same model and provide a maximum power of 3000w. I would like to plug their outputs together to make a 6000w total voltage regulator. ...
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1answer
45 views

Voltage regulator reference capacitor values

I've been looking at the LM78xx. simulate this circuit – Schematic created using CircuitLab The notes state: So, input and output must be referenced to ground. C1 removes power line ...
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3answers
76 views

Converting voltages using LM337

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 ...
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137 views

Voltage Regulator Not Providing Enough Current/Voltage

I am attempting to deliver 9V @ 1.1A to a PCB circuit design using an L7809CV voltage regulator which is rated for 1.5A max. Using a power supply, I can deliver the required current and voltage to my ...
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1answer
70 views

Circuit to select 12v or 5v power source

My design involves 2 micros that operate at 3.3v. I have output line drivers that operate at 5v. One of the micros is a wifi device so I want to stay away of switching power supplies. 5v or 12v can ...
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1answer
63 views

Can I use a voltage divider for shifing logic levels?

I'm trying to drive a 3.3V IC from an Arduino which has 5V logic pins, so I need to shift that 5V down. There's no data from the 3.3V device to the Arduino so I don't need to shift back up. Can I use ...
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2answers
40 views

Do I need a heat sink for small voltage regulator?

I'm using a 7808 voltage regulator in to-220 package. Vin is 12V, Vout is 8V. Expected max current should be in the range of 10mA, let's say 50mA at most. Circuit is to be encased. Do I need to add a ...
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3answers
71 views

Two LM317 Based Voltage and Constant Current Regulator Circuit

I have read some articles on on the following circuit. I was wondering if I can create such a Voltage and Constant Current Regulator for my Power Supply or not. My Question is - is this circuit ...
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1answer
26 views

Voltage regulator drop

First off I'm a beginner at electronics I don't understand much so bear with me. I've just constructed my first bipolar stepper motor circuit today on a breadboard. I've actually extracted the ...
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212 views

Should a regulator be added to a circuit where the power source voltage matches the ICs?

I am trying to design a very simple circuit consisting of an accelerometer IC and a Bluetooth IC, all rated at 1.8 up to 4.something volts and thinking to use a single CR2032 cell. Seems like these ...
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30 views

How to prevent output voltage spikes

My vaping device operates in two modes, variable temperature control (VT) and variable wattage (WT). The unit first sends out a ~1 second 30 watt/7.74 volt surge to the coil to see which mode it ...
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1answer
39 views

the proper way to wire up multiple supply rails

I am making a hexcopter for a shool project that is going to be powered and controlled via an arduino project. my current setup is as follows: Where the linear regulators are the 6 speed controllers' ...
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57 views

LTSpice output looks very odd when I use LM7805

LM7805 output is supposed to be 5V but it's very irregular and it's close to zero. I also tried adding a series resistor to the power supply but it was no use. Also, it takes forever to complete the ...
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4answers
80 views

Difference between a 'DC DC Switching Regulator' and a 'Linear Regulator'?

What's the difference between a DC DC Switching Regulator, and a Linear Regulator. I'm buying one to make a variable power supply (is this the best way to do it?) and I need to just output an ...