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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Why my ESP32-CAM won't power up with 5 volts?

I'm new into electronics and I decided to power up my ESP32-CAM with a 9V battery instead FTDI programmer (I measured it, it gives 5V to ESP32-CAM). I thought if I reduce voltage to 5V with mini ...
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What type of regulator to use for LEDs in a scale model vehicle?

I'm building a 3 ft scale model of a Peterbilt truck with high detail to include multiple 3mm colored LEDs. What type of regulator for differing 2 to 3.2 volts can I use? Yellow LEDs 2 - 2.2 volt Red ...
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Need help identifying this ldo pinlayout

I have this regulator in sot package measures 4.5mm x 2.5mm xy, The layout is 1-out, 2-in(together with the undersidepin), 3- ground. I believe this is a 3.8v regulator, i want to find a compatible 3....
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Help with voltage doubler in a WPT application

I need some help with this schematic to have higher voltage at Vrect. This is for charging a receiver at 25 mm in a WPT application. I was expecting a voltage of 2Vin at the output of the voltage ...
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Constant Voltage / Constant Current / Current Foldback Regulator Evaluation

I am a semi-retired EE in electrical distribution, so op-amps are not in my tool bag, and I could use some help. It has been over 30years since I last worked with them, and I need help from someone ...
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How to regulate 5V 3A to 3.3V for ESP32 and level up 3.3V to 5V on a PCB?

I'm making my first custom PCB with an ESP32-WROOM-32E. I am following this tutorial for the ESP32 part. My project requires a 5V 3A power supply but the ESP32 only takes 3.3V. The tutorial uses an ...
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Ai Thinker ESP32-CAM max input voltage

What is the maximum input voltage on the Ai-Thinker ESP32-CAM? I'm asking because the official docs specify a max input voltage of 5.25V, however it has an AMS1117 power regulator which has a maximum ...
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Voltage regulator equation

I'm designing a circuit using this buck regulator (AOZ2253TQI-20) from Alpha & Omega. Data sheet here, http://www.aosmd.com/res/data_sheets/AOZ2253TQI-20.pdf The data sheet doesn't specifically ...
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how to map 1V - 10V to 1.6V to 3.2V for voltage regulation using TL494

I am trying to design the given circuit where pin 1 is the non inverting terminal of comparator where I want to use a ref voltage of 1V - 10V but IC TL494 is accepting a voltage of 1.6V to 3.2V....and ...
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Need to produce regulated 5V from a source that ranges 3.7 - 6VDC

I'm building a device that will be solar powered and uses a microcontroller requiring 5VDC. The solar charger emits anything from 3.7V (from it's Li-ion battery) up to 6.0 V (raw output from the ...
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Ac voltage regulator to keep output voltage constant about 6v using diodes

I'm trying to design a circuit to keep the output voltage constant at 6 VDC for output load resistances between 0.5 to 3 kiloohm. It doesn't matter to have errors about 0.25 VDC on the output. My ...
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Audio noise when transmitting radio packets using the ESP32

I am building a sort of walkie-talkie using an ESP32 WROOM chip. I use the internal ADC to sample the microphone and the internal DAC to power small headphones. This all works OK, not the highest ...
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Key terms, multiple-output battery voltage regulator

I'm working on a space limited project, using an LI2430 rechargeable Li-Ion coin cell battery. I need to power a 2V7 LED rail, and a ...
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I need a chip tantalum capacitor c it has 107c 01JB1 on it

It goes in a 8A linear voltage regulator. It is a Chip tantalum capacitor c marks on it is 107C 01JB1 I do not know the value or rating of it or where to get one any help would be great.
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LM317... Do we need resistors?

In the circuit below, I replaced LM1117 with LM317. Do I need to add resistors at the output terminal? and how can I calculate the output voltage in this case?
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PSRR of an amp + ADC input stage

I have an input stage that consists of an amplifier then an ADC. The op-amp and ADC are powered by Buck voltage regulators. I want to measure the PSRR of this stage, so I am planning on breaking the ...
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Do I need a voltage regulator to maintain a constant 12V voltage to run a 12V brushed DC motor?

I am building an autonomous mobile robot. I am using Pololu 12V, 75:1 Metal Gear Motor (No Load Current: 300 mA, Stall Current: 5.6A), Cytron 20A Bi-Directional 6V-30V DC Motor Driver MD20A, and a ...
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Switching step-down voltage regulator gives lower output-current than input current

I'm currently trying to build a photovolatik cell -> DC Converter -> Battery-management-System. In the early stages of the build I was trying to use the adjustable voltage regulator alongside of ...
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Running a 220V siren with a digital clock

I'm trying to run a 220V siren from a digital clock that, upon reaching the set time, outputs 7.5V for about 2 seconds then stops. Now, I don't understand much about relays, but I did a little ...
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Powering a device from an unknown circuit - voltage drops from 3.3 to 3.2. Is it overloaded?

I want to power an ESP8266 (wemos D1 Mini) directly off of a 3.3v power source provided by my garage door opener. This was never intended by the manufacturer, but it would be very convenient. I ...
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Best way to provide 5V at a high current to power 12+ servos using battery power

I am currently in the process of building a quadruped robot that uses 12 SG90 servos, controlled by a PCA9685, for motion. I've found many examples of quadrupeds, but barely any mention of their power ...
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Regulating voltage with a zener diode

I need to supply a comparator in a bipolar way, which admits bipolar voltages of up to +-18V, like the LM139 (open collector). In its datasheet it says that the High Level Output Current is 1uA and ...
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Constant fixed output voltage and current

I have a simple question, I am a beginner in electronics and I need advice and help from a professional. I have a battery with a maximum voltage of 30 volt. This is my power supply for my projects (...
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3000W e-bike with four 48V batteries that I am running in parallel and series giving 106V need to regulate or limit my voltage to 72V

What options are there to reduce the voltage from 106V to 72V? I have four 48V 13Ah 30 ampere batteries hooked up in parallel and series. Anything will work as long as it's 72V.
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Help identifying an SMD chip

I have stumbled upon this mystery chip, it is probably a voltage regulator. It is inside a projector I want to repair. From what I gather, it's probably a 1.8 volt regulator. If you can confirm please ...
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What is the difference between voltage regulators, resistors, and buck converters?

I am new to electronics and I would like to know the difference between voltage regulators, resistors and buck converters like the LM2596 and their advantages, disadvantages and use cases. I tried ...
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Voltage divider and ADC

I have been designing an adjustable voltage regulator using an LT1965 and DAC signal from a microcontroller as shown in the following picture. The output voltage is regulated between 1.8 and 5V using ...
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Split current in a circuit?

I am looking to power an Arduino from a 12 V, 5 Ah lead acid battery, hooked up to a solar charge controller. (Max output: 12 V, 20 amps). I am also looking to power a Peltier Device, in order to cool ...
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How to limit power to LED, efficiently

I am looking to use a 12V, 5 ampere car battery on a small 5V, 2A LED. Typical applications online use a resistor or voltage regulator, but since I am using a battery I would like to conserve power, ...
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Wiring 6 LEDs to a 9V battery with a voltage converter and switch

Ok before I get blasted for my ignorance, I haven't done anything like this in many years and still never grasped the core concepts. I have a lamp that I would like to wire up that will use 6 LED ...
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Voltage regulation using TL494

I want to use TL494 IC for voltage regulation. For this, I am giving a 2.5 V reference to the inverting pin of the error amplifier and wants to vary a voltage from 0- 5V at the non inverting terminal ...
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Using a voltage regulator dimmer with a 220V water pump

I am builgin a hydroponics vertical farm. The motor which I bought is too powerful (220V/100W) for my system so I want to reduce its power with using a voltage regulator dimmer. My motor has a ground ...
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+12V main voltage tolerance as power input for an industrial PC motherboard

Regarding the following circuit, we have two main devices: MAX8792 Step-Down Controller. LT3065 LDO. I want to know the minimal "+12_Main" voltage that can be applied and still make this ...
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What is the simplest way to get a negative DC power?

I have several voltages available and I need a -12v dc power for a DDS function generator. The available powers I have are: 220v AC 15v DC 12vx2 DC 5v DC Edit: I tried the method where I connect the ...
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4 answers
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36VDC to +/-15V linear regulator setup - will this design work?

I designed a +/-15V power supply setup and trying to find/fix problems before running another PCB production run. It will accept 36VDC (800mA) from an off the shelf part via a barrel connector. I ...
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3 votes
1 answer
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Semi-controlled full wave rectifier

First, a little background. I picked up a Canadian-made 1971 Lincoln Idealarc 250 on the cheap with the intention of turning it into a constant voltage capable machine for wire processes. The fan ran ...
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Why does my Push-Pull-Transistor blow up?

I'm currently working on a buffered voltage divider, followed by a Push-Pull stage to be able to source/sink up to 500mA per rail. The whole thing will is powered by 36VDC, then it's split by half ...
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Power 5V and 3.3V components from li-ion battery

I want to make a portable device that runs of a rechargeable li-ion (4.2-2.7V) batteries. I have components that run on 3.3V (ATmega328P ,GPS) and some LEDs (5V.) There are multiple ways I can think ...
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Something wrong with my schematic for TPS54202 - high output voltage

I guess it may be pretty simple thing due to my lack of understanding. I designed a PSU converting 12V to 5V using TPS54202HDDCR. Followed the datasheet and made the schematic as follows: I used eq. ...
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I would like to drop a variable DC voltage from input 30Vdc to 200Vdc to output 5Vdc with a max 200mA

I am new to electronics and would like some help if possible. The incoming voltage will be variable from 30Vdc to 200Vdc coming from a bank of solar panels. The output is 5vdc at a max of 200mA. I ...
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2 votes
4 answers
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What is the relation between NE555 voltage doubler output voltage vs load?

Considering this circuit (NE555 voltage doubler), how can I find the formula for the relation between the value of the load resistor and the output voltage? You can see below two examples of this ...
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Voltage ripple reduction

Is a capacitor or voltage regulator better for reducing voltage ripple in a small 24 VDC power supply coming from a rectified 24 V AC alternator?
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Is it important to not exceeded the capacitance of 2.2 µF for the internal regulator of an STM32F722xx MCU?

On page 109/230 of the STM32F722xx datasheet (I use the STM32F723VE) it says that the capacitance of the external capacitor that is stabilizing the internal main voltage regulator should be 2.2 µF. We ...
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Problem replicating voltage regulator circuit in LTSpice

I'm new to voltage regulation circuits and have a circuit from https://www.ti.com/lit/an/snoaa20/snoaa20.pdf that I've used as inspiration: My circuit in LTSpice is below: The Zener diode is 7.5V. ...
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Help in understanding how this over-voltage regulator works

I found a circuit on the internet that's using a comparator to solve a similar problem to one I'm hoping to solve (voltage regulation). This is the circuit: (it's from https://www.ti.com/lit/an/...
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Switching off an LDO to avoid damages?

Say I'm using an LDO to power an MCU such as the ATmega328p with 3.3V from 3 NiMH AA batteries. What it isn't clear to me how to deal with brown-out situations. I can think of 2 possible risks (i.e. ...
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Capacitive moisture sensor and need of voltage regulator

I am trying to build a (capacitive) moisture sensor with ESP-01S, my goal is to measure the soil moisture level, send it via wifi to a server (estimating 10-15sec execution time) and finish it off ...
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3 votes
5 answers
973 views

LM7805 reverse polarity protection

I have a 12 volt power source which powers an LM7805 regulator, in order to power a circuit board. If I were to accidentally connect the power source backwards (reverse polarity,) which would be true ...
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What is the meaning of the following statement regarding Zener diode addition at the output of a voltage regulator?

What is the need for adding an external diode at the output of a series regulator? What role does it play in the application circuits shown in datasheet ? Following is an excerpt from the datasheet ...
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Diode placement for AP1603 boost regulator

I'm working on a circuit using the Diodes Inc./Anachip AP1603 boost regulator. The datasheet (linked above) notes: Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 ...
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