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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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How to correctly indicate reponse time of a power supply

I want to draw something to indicate the response time of a power supply to a change on the load side. Here is what I came up with and I want to ask if it is the correct interpretation: Does the ...
DEKKER's user avatar
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3 votes
3 answers
840 views

Is the 7809 bad for a DC motor?

I have a small 12V, 3S1P pack of 18650 cells. I am trying to power a 9V motor, but when I turn it ON the motor becomes very unstable, it spins, keeps running slow, then slows down, sometimes it does ...
Panamanian's user avatar
0 votes
1 answer
47 views

Help identify this SOT-23 5 pin component labeled ADU06 and weird behavior

I'm new to fixing circuits and I'm trying to figure out why this board will not boot. I've traced the Vcc on the MCU (H8/38024) to this circuit. I'm guessing that it is a linear regulator, but when I ...
chefweil's user avatar
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0 answers
33 views

Proteus 8 issue [closed]

I imported a Voltage Regulator model Library(AMS1117 3.3V) from Digikey/Snap-EDA. However, no matter what configuration I use, output voltage is always zero.
Soham Ghaisas's user avatar
1 vote
1 answer
44 views

Distribute power from one battery to multiple devices

I have a battery, Li-po 3300mAh 22.2V 60C. Then, I have a system (main system, so to speak) which consist of STM32MP1 MPU (operating voltage [1.71, 3.6], typ. 3.3), STA8135GA GNSS IC (operating ...
keenan's user avatar
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2 votes
1 answer
82 views

Confusion in deciding a voltage regulator's input output capacitor types

As a part of a PCB, I want to use this AMS1117-3.3 voltage regulator with 22uF input and output capacitors as follows: As for the exact part for the capacitors, I was planning to use this X7R ...
user1245's user avatar
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0 answers
86 views

Can a positive and negative voltage regulator be connected in parallel on a diode bridge and capacitor?

Can a positive and negative voltage regulator be connected in parallel on a diode bridge and capacitor? If so, how would this be done? Example: L7924 & L7812. I have a 12A transformer with two ...
mike's user avatar
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0 votes
1 answer
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Need help to identify an SSD Voltage regulator

I'm trying to get my data back from my dead SSD, I found a short on the voltage regulator that become very hot when putting the power but I can't identify the part and get the datasheet. Here is a a ...
Nicolas Twisty Pecou's user avatar
0 votes
0 answers
39 views

LM5013 buck regulator won't have high duty cycles

I have made a PCB with the LM5013 buck regulator, but can't seem to get the output voltage high enough. The goal is to be able to adjust the output voltage using the LOAD_REGULATE pin, for a variable ...
leheim's user avatar
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1 vote
3 answers
80 views

Identify SMD voltage regulator with top marking: BDCM

I've a circuit powered by a regulator IC. The regulator is a SMD one, with this code on its surface: BDCM The package SOT-23-6. Unfortunately, I do not find any information about the BDCM marking ...
user386170's user avatar
0 votes
1 answer
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How to Properly Select Resistors and Capacitors for a Voltage Reference Circuit with BJTs

I am working on a reference voltage circuit and I am having trouble when selecting the appropriate resistor and capacitor values. The circuit involves OP07 operational amplifiers and transistors (...
Cheche Romo's user avatar
2 votes
1 answer
51 views

IRF540 MOSFET Replacement [closed]

I am looking for a drop-in replacement for an IRF540 MOSFET with a more robust transistor. I want to find a MOSFET with a larger, Safe Operating Area because it is the pass element in a linear 14-volt,...
Dereck's user avatar
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0 votes
0 answers
118 views

Using a 24V dimmer with 12V

I have a Paulmann 70975 24V LED touch dimmer that I want to use with 12V LEDs. The input voltage is provided by a MeanWell LPV-60-12 12V 5A power supply. The consumer is a 12V 2835 white LED stripe of ...
redspider's user avatar
3 votes
2 answers
280 views

Identify component marked R3377 in a ZVR1 [Playstation VR MB]

can anyone help me to identify a component on playstation VR1 please? Looks like voltage reulator > Component = R3377 [what the numbers mean?] There is no picture on TV or VR headset. [only HDMI ...
Peter Mižo's user avatar
2 votes
1 answer
227 views

I'm getting 60-130V of output from a 5V voltage regulator. Does anyone know what went wrong?

I made a 5V power supply, but when I connected my multimeter probes to the output lines of the supply it read 60-130V. the voltage after the rectifier should be around 18-19V. If anyone can give a ...
catandmoose's user avatar
0 votes
1 answer
54 views

3.3V regulator and Comparator not working as anticipated

This is my first time designing something like this so excuse my inexperience. My objective here is to create a simple circuit for checking if a particular component is good or has been damaged. From ...
John Lapinski's user avatar
1 vote
0 answers
31 views

Identify Regulator from Canon Camera CMOS Board

I'm trying to Identify 3 Regulators from a Canon Camera CMOS Board The only hint I have is L814, A1BE5, LA42 But I don't know how to find the actual reference of the parts, I need them to repair my ...
Gamer Gamer's user avatar
0 votes
2 answers
72 views

Identification for L313 marking, 5 pins

Anyone have any idea what these two chips are? I believe they could be voltage regulators, but I am not too sure as I can't find the documentation anywhere. Both of them are connected to multiple ...
Cillantro's user avatar
  • 129
0 votes
4 answers
158 views

Should a diode be placed between the output of voltage regulator and the battery?

When applying constant voltage to a 8-volt lead acid battery using a 7809 voltage regulator, should a diode be placed after the output pin and before the battery, anode to the output pin and cathode ...
SA A's user avatar
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0 answers
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How do I accurately recreate the ER effect (using electro-rheological fluid)?

I am working on a project that makes use of the unique properties of electro-rheological fluid (ERF), a substance that changes viscosity when an electric field is applied: For this project, I want to ...
Saarth Desai's user avatar
0 votes
1 answer
57 views

Problem to transmit data using FS1000A

My circuit have 4 simple parts. Input voltage is 14.5 so I use two regulator 7805 and 7809 to power supply boards. I use 7805 for WeMos D1 mini (clone) and 7809 to supply power of FS1000A (max input ...
math deaman's user avatar
0 votes
1 answer
52 views

Identify 5 pin SMD marking L1A1

Please help to identify Smd IC package SOT23-5 / SOT25 marking L1A1 and 2 pin is ground
shekhar's user avatar
1 vote
3 answers
106 views

Voltage regulator with polarity depending on input

I'm pretty new to electronics, I have some very basic notions, and I need help with a little project I'm working on, basically I have an input that can vary between 4 and 13 volts and I need to keep a ...
Ax34's user avatar
  • 11
0 votes
2 answers
55 views

Regulate voltage from 24V to 5V for radio receiver module

I'm going to make my own quadcopter. I plan to use 6s Lipo battery (24V). Radio receiver module accepts 5V input power source. Seems like voltage regulator will be overheated cause of big voltage ...
Pavlo's user avatar
  • 13
1 vote
1 answer
71 views

Using Buck-Boost as LED driver

I am trying to use a buck-boost controller like LT8390 as a LED driver. This controller can act as a current controller if the current through sensing resistor connected to (ISP/ISN) can be adjusted. ...
chami's user avatar
  • 524
0 votes
0 answers
43 views

When a typical fixed output voltage LDO is unpowered, is the output pulled to ground or is it floating/high impedance?

I am wondering since in a design the gate of a PMOS is pulled up by the output of a voltage regulator. Since the source of the PMOS still sees voltage on its source in that condition, I don't know if ...
TnF's user avatar
  • 151
2 votes
1 answer
66 views

Bias Voltage affecting op-amp at 0v

This question is a follow-up from the setup described here Recap: I am designing a circuit which is intended to map a signal in the 0-5V range to the 1.75-7.0V range. To do this I am using an LM317T ...
Jayson Okhman's user avatar
1 vote
3 answers
136 views

How can a transistor in Voltage Follower (Common Collector) mode withstand more than VBE volts across the base emitter junction?

Let me confess before beginning that I am not so professional or expert in this field. I am a self learned hobbyist who learns things from YouTube and applies them in the reality. Having worked with a ...
CoderBittu's user avatar
0 votes
1 answer
98 views

How do I implement a USB-C connector onto a pcb to power a 3.3v Raspberry Pi Pico?

I've been looking into how to create my own pcb with a USB-C connector which breaks out into pins (VCC, D+, D- and GND) to then connect this to a Raspberry Pi Pico microcontroller but I have a few ...
cAYK's user avatar
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3 votes
3 answers
123 views

Selecting appropriate Opamp for RRO applications

I am designing a circuit which is intended to map a signal in the 0-5V range to the 1.75-7.0V range. To do this I am using an LM317T voltage regulator in conjunction with a TLC2272 Rail-to-Rail opamp. ...
Jayson Okhman's user avatar
3 votes
2 answers
323 views

How does a "regulating" source follower work?

Can someone explain to me how this circuit works? The output voltage is ~2.4V. The zener diode breakdown is 4.7V. From what I can see the OUT is simply Vgate - Vgs = 4.33V - 1.85V = 2.48V. Is this ...
JoeyB's user avatar
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0 votes
1 answer
54 views

calculating total current consumption before and after voltage regulator

I have a simple circuit. IC1 is a standard 7805 voltage regulator. Let's assume the battery G1 is 10 volts and all LED's each have 1V for its voltage drop. Do I calculate total current consumption as ...
mike_s's user avatar
  • 21
0 votes
2 answers
57 views

Problem in powering up esp32 with MIC29302 IC regulator [closed]

I am trying to power the esp32 with the mic29302 regulator. I have used ams1117 for various applications but in this particular circuit I need more current (2 A) so I switched to mic29302 which can ...
pouya nosratkhah's user avatar
1 vote
1 answer
82 views

Opamp and regulator not behaving the same on breadboard vs SPICE simulations

I am designing a circuit which is intended to map a signal in the 0-5V range to the 1.75-7.0V range. To do this I am using an LM317T voltage regulator in conjunction with a TLC2272 Rail-to-Rail opamp. ...
Jayson Okhman's user avatar
0 votes
1 answer
52 views

extend 9v 500mA to 7 meters

I want to use the cat6 cable to extend 9v 500mA to 7 meters, what is the method without losing current and voltage, the transformer must stay at home due to weather conditions of heat and rain?
karimovv's user avatar
2 votes
0 answers
109 views

SiC461 regulators unpredictably dying under load

I am having problems with a design using SiC461 regulators. I attached a snippet of the relevant schematic file. The problem I am facing is that under load (powering an LED strip with peak current of ...
Richard Kovac's user avatar
0 votes
0 answers
15 views

NCS1S2403SC circuit help

I need some help to finish an experiment of sorts. I am working with a NCS1S2403SC voltage regulator and previously I was working with another voltage regulator. There is an image of that circuit down ...
Ash Benlolo's user avatar
0 votes
0 answers
60 views

Voltage regulating circuit for high frequency signal

I have a running circuit with an AD9833 to generate a sine wave with a desired frequency and phase, now I also want to digitally (not just a mechanical potentiometer) control the amplitude. The output ...
ForzenikHD's user avatar
1 vote
2 answers
52 views

Do I need a buck IC to get 3.3 V, or a buck/boost, or an LDO?

The voltage supply of my FPGA and sensors circuit is 3.3 V. If I use a Li-po battery with 3.7 V nominal voltage and 3 V discharge cut-off voltage (the LP-803860 3.7 V, 2000 mAh with PCM), do I need a ...
NihelKh's user avatar
  • 11
1 vote
2 answers
107 views

LM317-N output voltage lower than expected in LTspice Simulation

I am designing a circuit that requires a regulated 1.75 V source. After searching around I found the LM317-N voltage regulator and got it's SPICE model from TI to simulate it within my circuit. The ...
Jayson Okhman's user avatar
0 votes
1 answer
91 views

LCD PCB component identification, SOT-23-5, "DK-NON"

I have a question about an SMD component that blew up on my microscope's LCD PCB. It has 5 pins (2 on one side and 3 on the other), the lettering on the back says DK-NON. enter image description here ...
Warlock1663's user avatar
-1 votes
1 answer
48 views

producing -2.5V from -12V using LM4040

The is a section of power supply schematics. I have a -12V power supply with a parallel LM4040. I know there is a voltage drop over the 1K resistor . What is the trick of the LM4040 diode which ...
Chris95's user avatar
1 vote
0 answers
56 views

Reverse current blocking FET circuit for batteries, does it work?

Based off of a previous post found here, I've created this circuit below to simulate the reverse current coming back from an FET. I've replaced the switch with a NMOS that's controlled by the presence ...
makotoyuki's user avatar
0 votes
2 answers
35 views

Isolating Power Fluctuations and Buck Converters

I am building a robotics control module which, of multiple parts, controls servos. When enough servos move, a large power drop causes the microcontroller to reset. This usually happens with 3/4 servos,...
Raine's user avatar
  • 1
4 votes
4 answers
984 views

What is the disadvantage of using a boost converter? [closed]

I am referring to this boost converter. I want to know the disadvantage of this. It isn't possible that this could just generate free voltage, there would be some disadvantage. I actually need this ...
S.A's user avatar
  • 53
0 votes
1 answer
77 views

What's the best way to make sure I have a known VCC on a battery powered device?

I'm making a portable device (well not really portable, but intended to be set up away from mains power) powered by AA batteries. I need a stable VCC as I have displays that I don't want the ...
Steam Ranger's user avatar
0 votes
1 answer
74 views

Identify diode specs

I need help identifying this diode, I believe it to be faulty as I am getting a reading in both directions when testing with a multimeter. The markings are 3125. There is some discoloration on the PCB ...
psion's user avatar
  • 1
1 vote
2 answers
167 views

Voltage regulator output signal becomes noisy when connected to a CPU

I am currently working on a PCB where it has two onboard voltage regulators. the first one makes V1in=20 V to V1out= 5.5 V. The second voltage regulator makes V2in=5.5 V to V2out=3.3 V. The 3.3 V ...
EmeraldMonk's user avatar
0 votes
3 answers
99 views

How to calculate current limiter resistor when voltage regulator is involved?

I'm designing my first PCB and I'm not sure if the diagram I found on a datasheet is complete. For what I have read, there should be a resistor between R1 and the transistor Tr1. I have followed this ...
Waripolazo's user avatar
1 vote
1 answer
61 views

TPS564247 switching voltage regulator problem

I have been working on a 12 V to 3.3 V DCDC converter that uses the TPS564247 switching regulator IC. Here is the schematic: The problem is that the IC keeps resetting itself once a second. At first, ...
Saláta Szalonna's user avatar

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