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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Proper DC supply vs batteries
For the current limiter circuit(using voltage regulator), proper DC supply matches the simulation results. However, when a battery of equal supply voltage is connected, the circuit goes haywire i.e. ...
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BLDC ESC with voltage regulator [closed]
Will there be any issues if I add buck-boost voltage regulator between battery and the BLDC motor ESC?
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Appropriate capacitor ratings / types for 5 V DC power supply?
I am designing a 5 V DC power supply. I will explain the main component set up excluding the capacitors since I am not sure of capacitor placement or appropriate ratings.
I intend to supply power to ...
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Building a power supply for a Raspberry Pi 4 but having trouble with the output voltage of regulator
I am using a LT1529-5 regulator to drop 12 V 2 A down to 5 V 3 A to power a Raspberry Pi 4 from a different wall DC power supply.
When my circuit is unloaded, the output is maintained at 5 V. When I ...
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What's is this? An SMD Voltage Regulator?
I am trying to repair a fitness machine control PCB with an SMD component with unknown markings MVRB and LFNB. Could you please help me to identify this integrated circuit?
From the PCB, it is ...
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µA723 output Zener diode: why is it as high as 6.2 V?
The µA723 voltage regulator has a 6.2 V Zener diode on its output. I am trying to understand why the Zener voltage is as high as 6.2 V. (LM723 or LM723C are more or less equivalent parts, raising ...
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Effective voltage reduction from 3.3v to 400mv without introducing temporal delay [closed]
I am working on the development of an auditory-based MobileEEG hardware in my research group. Our objective is to comprehend the perception of sound using an ear EEG setup (cEEGrid) in real-life ...
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How is voltage regulated on the output of this supply? [duplicate]
This lil' piece of eye candy is a portion of an SMPS schematic. How do the TL431 and optocoupler work together to regulate the output voltage? Moreover, and I'm assuming this plays a role in it too, ...
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WCCA analysis - Induction selection - Mismatch with recommendation at low current values
I'm performing the WCCA analysis of a 3.3V buck regulator(AP64200Q).
Datasheet: https://www.diodes.com/assets/Datasheets/AP64200Q.pdf
In the current circuit:Vin=24V,Vout=3.3V,Max.current=300mA so ...
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AOZ2261 Buck Switching Regulator doesnt give reasonable Output
Im designing a bruched motor driver unit that controlled with a mcu (stm32f410) and H-Bridge driver (DRV8243S). im using AOZ2261NQI-12 to supply H-Bridge driver.
The IC supplied with 24V (polarization ...
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How to bypass simple zener diode voltage regulation at low volts?
Is there a simple circuit to automatically bypass zener diode regulation at a voltage lower than its rating?
I have a bunch of simple circuit designs that accept 11-15VDC but in the intended industry ...
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Short circuit of voltage regulator
I am trying to design a circuit to get an amplified signal out of an OPT101 photodiode.
The photodiode contains an amplifier (and there is an additional opamp for further signal amplification on the ...
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Load regulation of constant current source
LM317HV data sheet provides following reference circuit for use as a "simple, fixed-current regulator" in section 9.2.9.
It also specifies typical load regulation of 0.1%. I don't think the ...
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How to generate 0-150V adjustable DC output? [closed]
I wish to generate a voltage range of 0 - 150V output @ 2A Max to drive an actuator, and I don't really have a lot of great ideas at this point.
I have 2 power sources available, one is 220V AC, ...
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Power on unused pairs of Cat6a Ethernet cable / home made voltage regulator? [closed]
At the end of the afternoon, I have been given the following task : try to get a sensor working over a 100 m Ethernet cable (Cat6a, i.e. 4 twisted pairs, each pair shielded individually). The ...
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What is going on inside this light dimmer?
I have a Cooper Controls SF10P-W Slide 0-10V Dimmer designed for controlling LED or Fluorescent light fixtures.
I assume this is the kind of dimmer described in IES TM-23-11 as "4-Wire Low ...
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Is the ouput of a given LDO high impedance when the LDO is shutdown
If a LDO is in shutdown, is the output of the LDO high or low impedance? Specifically for the LT3065.
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Diy variable current regulator (power work bench) using dynamo [duplicate]
This the setup I was referring to.
The right motor is the driver motor and the left is the generator. So the output of the the generator is what I want to vary especially the current. As stated, the ...
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Instructables DIY current limiter circuit [duplicate]
I found this inline and was hoping if that circuit is okay. Instead of a battery though, I want to use a dynamo (plenty of juice-wise).
Output of dynamo is 18 V 200 mA. I wish I could adjust the ...
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DIY Voltage and current regulator
For DIY sake. I'm working on a current and voltage regulator and i found this
Online. But instead of a c5200, I'm using the d716 for it. I have a dynamo with 20 volt and 200ma current supply.Is it ...
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What are the loop gain and the transfer function of this transconductance amplifier feedback circuit?
Related to my previous questions, I would like to know what the approach for determining the loop gain and transfer function of the circuit presented below is:
The circuit is highly simplified. The ...
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Voltage Regulator Overall Efficiency
I am working on the ISL91302BIIZ-TR5931 programmable voltage regulator. It is configured as a two phase output as shown in the figure below:
From the datasheet: I found that the efficiency would be ...
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Microwave oven control board not working [closed]
I am attaching two pictures of the control board. Can someone explain why the positive output from transformer is going to ground while negative output is going to the voltage regulator. The negative ...
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Would this be an acceptable implementation of an OTA-based voltage regulator?
I am building a discrete voltage regulator, centered on a differential pair with an active load.
I have seen the single stage differential pair being called an Operational Transconductance Amplifier. ...
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Input current in voltage regulators
I am watching a course on Udemy about hardware design. The lecturer has provided a tutorial on how to calculate the current consumption.
I got quite confused when he started to talk about the input ...
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Self-powered measurement unit for current transformer
A few days ago my friend told me his end-year project about a current transformer that capable of measure current with its own instrumentation. And some concept that we discussed confused me. Let's ...
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Understanding this linear series-pass regulator circuit
Please refer to the schematic extract above which is the positive half of a bipolar voltage regulator in an amplifier. It is a mostly classic design but there is a part I don't understand. The part I'...
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Power Switching Circuit ESP32
I've designed the power supply section for powering an ESP32 board and for switching between USB Power and 5V external power, would this circuit be sustainable and work properly?
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Series regulator with op-amp damaging power transistors
Hello my name is Juliana, I am facing a problem with my project for a 2A linear adjustable power supply
When it is configured with a voltage lower than 65V and current higher than 1.3A, the power ...
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Need ideas for stepping down voltage [duplicate]
I need to reliably step down voltage from my 12V adaptor to 6V. I want to be able to get 3-4 Amps from this 6V output. I was until now using a buck convertor module but even though it advertises 2A ...
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DC motor speed control using SCR
I'm trying to design a DC motor speed control circuit using an SCR, where I want to control the speed of a DC motor like the way electric fans work by changing the fan speed.
In this project we are ...
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Burning sound from the PSU
I am trying to make a bench power supply from an old 350W PC PSU
that provides 4 lines
3.3V 8A
5V 9A
12V 11A
-12V 1.5A
Here is the connections diagram:
I used this step down module to be able the ...
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LT317 charger LTspice simulation acting weird
I am currently trying to design the constant-voltage charging block for a Li-ion charger as a part of a course project. The charger block has an LT317 regulating the charging voltage to ~16.8V and an ...
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Regulated 3V from a LFP battery
I have a small device that runs using a CR2032 battery which I would like to replace with a LFP battery. So I need something in-the-middle that adjusts the voltage. It is a very low consumption device ...
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What type(s) of analysis should be performed on a discrete voltage regulator circuit?
I am tasked with building a fully discrete voltage regulator. I am restricted to only using discrete components, such as transistors, diodes, resistors etc., no ICs are allowed.
Something like this:
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How to get a voltage range of -1.5V to 1.5V using batteries combination of 3V and potentiometer
How to get a voltage range of -1.5V to 1.5V using batteries combination of 3V and potentiometer.
So for the details, I'm using batteries of 1.5V each, which are connected in series such that output is ...
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How to control the speed of a DC motor that can rotate in both directions? [closed]
This is my case:
My cargo van has fan/extractor powered by an one-speed brushed 12v motor.
Two switches in the instrument panel control the rotation of the motor by reversing the polarity.
Switch 1: ...
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Is it possible to use BQ25629 as both a lipo battery charger and a stable output regulator?
I am a bit confused looking at the datasheet for the TI BQ25629 with regards to the SYS output voltage. Essentially, I have a 3.7 nominal voltage 290 mAh lipo battery that needs to provide around 100 ...
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Ripple Noise Using Capture CIS and PSpice
I am trying to measure the ripple output noise of a regulator using simulation on Orcad CIS and PSpice. The output voltage and current are correct however the transient time response is not showing ...
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What is purpose of this diode?
Recently, I was exploring methods to distribute power akin to EURORACK systems, and I stumbled upon this schematic.
I've attempted to grasp the role of diode D4 in this setup, but regrettably, I've ...
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Why does my voltage regulator always output maximum voltage? [closed]
I bought a cheap AC-AC voltage regulator from AliExpress (marked as being a 4000w SCR) very similar to the one toredown in this article.
As one commenter points out, the output voltage remains at ...
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Identify SMD voltage regulator with top marking: T1A30
I have a circuit powered by a 3.3 V regulator. The regulator is a SMD one, with this marking on its surface T1A30:
I am in need of a comprehensive identification and description of the SMD voltage ...
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Converting a fast-switching 0-2.5V input to TTL signal
Dear fellow engineers,
I am attemping to convert a fast switching (~ns) 0V - 2.5V pulse from FPGA into a TTL-standard (0V - 5V) signal. I have been browsing for voltage regulators online. Most of them ...
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LM7805 in LTspice
How can I use the LM7805 regulator in LTspice? I know it's about importing the third party components, but I am not getting it. Can somebody help please?
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Identification of ABLIC (Seiko Instruments) brand components
Lately I've been looking for components of the brand ABLIC (Seiko Instruments).
On the following examples, i was only able to identify the brand.
However I cannot find a methodology to find the ...
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Shunt regulation - discrete or linear? [closed]
This is a spin-off of the question I've asked before. I've received many interesting answers and summarized them there. I also accepted most interesting suggestion. During this time we also bought and ...
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I am trying to identify an smd 16 pin Linear Technology voltage regulator chip makes 5 volts with 6 volts dc in
I am trying to identify an smd 16 pin Linear Technology voltage regulator chip makes 5 volts with 6 volts dc in.
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Weird readings on oscilloscope [closed]
Its my first time using oscilloscope, I was trying to read output from AS1117 on an Arduino board, and this is what I get.
I was expecting square wave, but its nothing like it. Am I doing something ...
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Can I hook up a 9V unregulated power supply to a 9V voltage regulator to stabilize the output?
I've got a 9V, 200mA unregulated power supply (wall wart). With no load, the output of the device measures about 13 volts. Can I wire that to a 9V voltage regulator IC, to stabilize the output? Or do ...
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Why did the Lucas voltage regulator use rectangular section enameled wire for one of the windings?
In the 1930s and subsequently, Lucas supplied a car voltage regulator of the twin bobbin type.
A detailed description of how it operated can be found here, but in summary, one solenoid operated a cut-...
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