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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Powering multiple components with different power requirements from a rechargeable battery

I'm building a toy for a baby that basically runs an ESP32, 2 class-D amplifiers, an SDCard module and a NeoPixel (a single one..). It has to be battery powered and so far I've found out that it's ...
1 vote
1 answer
42 views

9 V to 12 V step-up converter to drive load between 10-100 mA, and no load

I'm working on stepping up the voltage from a 9 V, 150 mA power supply to 12 V, with a load of 10-100 mA and moments where there's no load. I have implemented something similar with this IC ...
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Use GND as V- in voltage regulator

For a circuit sensor, I need +15 V/GND/-15 V. My supply voltage is a single +5 V rail from a standard switching PSU. I looked at different voltage regulators and found, besides others, the ITA series ...
1 vote
3 answers
58 views

Configuring regulator shut-off

I'm building a regulator based on the TPS63020 buck/boost converter, and I'd like to program a low-voltage shut-off. If I'm understanding it correctly, when VINA sees a falling voltage and it crosses ...
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0 answers
54 views

Need help identifying 6-pin SMD in Android TV box

I somehow identified the problem in my Android TV box: I can see a short in a 6-pin SMD. I am not an expert in fixing SMD. I am also unable to read the number written on the component (just a guess: ...
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Can I use a resistor or do I need a regulator?

I have two really nice outside lanterns, originally designed for candles. I want to convert them to LED, with a solar panel, batteries, dusk to dawn switch and LED bar. I understand the circuit for ...
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-1 votes
1 answer
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54 V input on one, or two 40 V linear regulators? (LM317)

Before I explain the situation I am in, please bear in mind that I am completely new to electronics, and I want to spend as little money as possible on my current project because of outrageous pricing....
1 vote
1 answer
57 views

How to set Vref on a variable power supply

I recently recycled a 070XF01 voltage regulator from an old PCB. I want to make a 5 V power supply for a small project to power an ESP32 dev board. I'm still new to reading datasheets and this has ...
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11 votes
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Does PSRR improve with multiple LDOs in series?

Would having multiple LDOs with different output voltages are in series, for example: 5 V from a buck converter -> LDO1 (3.3 V) -> LDO2 (2.8 V), and assuming all LDOs satisfy the dropout voltage ...
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1 vote
1 answer
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Voltage Shunt regulator NCP431

I'm trying to figure out how the voltage shunt regulator for my case is working. Below an extract of the electronic schematic of an isolated flyback board Ref NCP11187A65P45WGEVB from OnSemi which has ...
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How to slowly store higher voltage from low power source?

I want to use a small solar panel (about 1V 15mA in ambient light) and then boost its voltage to 6V to slowly charge a 6V battery or capacitor. I have experimented with some generic boost converters, ...
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Linear regulator with high voltage and inductor circuit [closed]

This circuit is based on inner circuit design LM317 IC. The circuit takes a voltage reference of 12 VDC and an input of 320 VDC, and should output 12 VDC, which it does, but in the simulation ...
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What kind of temperature would I get with XL4015 voltage and ampere regulator converting 12 V to 6.5 V?

I have a guitar amplifier (Blackstar ID Core 10 v2). Its power brick has gone bad last year, and I have been searching for a power brick ever since. This device works with 6.5 V, 3 A DC. It is pretty ...
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2 votes
1 answer
50 views

Circuit to limit a variable-voltage DC supply to 30V

I want to charge a powerbank which supports 11-30V input with a solar panel with an open-circuit max voltage of 48V (41V under load). I live in a cloudy area, so I don't expect the solar panel to ...
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39 views

Capacitive Signature on CAN Bus Driver SN65VHD230

I'm working on a small custom PCB that uses the TI SN65VHD230 CAN Transceiver and the square waveforms of the CAN bus aren't as clean and crisp as it seems they should be. I have a 10 μF MLCC on the ...
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Mediatek MT3333AV doesn't start

Recently I started a project with an MT3333AV GPS IC. I desoldered the chip from the L86 GPS module and put it into my project. After many tries I still can't start the IC. There is no 1.1 V going ...
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Car switch ripple noise and regulator

With this circuit I try to convert 12V car battery to 3.3V. When I turn switch multiple time to start motor, high ripple in input happen. Between 6 to 12 V. I used 1000 uF capacitor in input and ...
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Op-amp error amplifier protection in tube amp high-voltage shunt regulator

Check out my latest contraption, a B+ regulator for tube amps, adjustable from 200 to 300 V. The error amplifier/shunt MOSFET bias servo op-amps are fed 5 V from a 7805-based external board placed ...
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2 answers
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A question about 78XX power supply design

I want to get 12V and 5V from a 24V power source. 12V drives a MOSFET H bridge and a cooling fan. 5V is for a microcontroller. I have already damaged a microcontroller due to a failed 7805 regulator. ...
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1 answer
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LM1117 5 V regulator and 2 servos

I just started my first PCB and I have a question. I want to use two servos (SG90s) and a 5 V regulator powered from a 7.4 V battery. After all my calculations the temperature that is dissipated is ...
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1 answer
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Why did the Arduino burn in this circuit?

I've designed a PID fan control system which takes air quality measurements via sensors and sets the AC fan motor speed by changing the H bridge frequency. Circuit is as below: Full: Top: Bottom: ...
2 votes
1 answer
175 views

Weird circuit schematics

I have hired a guy to design a simple voltage regulator with standard ATX connectors. It looks weird to me; can you guys check it out, please? It makes me wonder if the 12 V (most likely switching ...
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1 vote
1 answer
42 views

How to control high current voltage with small current voltage linearly?

I want to make an 18650 charger without a microcontroller for fun, I was designing a very simple circuit but I had a problem with adjusting the voltage if current/voltage excceds max current/voltage. ...
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Switching regulator rated for 3 A but doesn't power a device that needs 2 A

I am working on a project that utilizes a 5 V fixed buck regulator (LM2576T-005G) to step down 12 VDC input from a wall supply in order power a Raspberry Pi 4B on a PCB. The circuit and passive ...
3 votes
1 answer
288 views

Confusion about feedback resistor values for buck converter

I'm making my first voltage regulation first with a buck converter, but I'm having some trouble making sense of the following datasheet. https://www.ti.com/lit/ds/symlink/tps560200.pdf So I've made ...
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Circuit to power LEDs with various regulated output voltages on circuit? [closed]

I'm designing a PCB with a few regulators on it. I will put some status LEDs on the output of each regulator to indicate that it's on. I'm thinking of some combination of 24V, 17V, 12V and 5V. I'm not ...
0 votes
1 answer
38 views

Minimum load current on boost converter

I was hoping to use the LM2731Y boost converter to step up 3.6V to 7V, but I'm unclear if this will work for my load requirements. I will likely have a fairly low current draw (<50mA) and there is ...
2 votes
2 answers
361 views

I built a DIY DC-DC buck regulator. It's getting extremely hot. Why?

I am really scratching my head at this. I don't see anything wrong with my circuit but my regulator gets EXTREMELY hot while in operation. What I'm building is a USB phone charger for my e-bike as ...
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1 answer
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Voltage regulator keeps shorting and dying [closed]

I am trying to investigate a problem with a voltage regulator I am using in my circuit. The regulator in question is the ADP3339 (3.3 V variant). I have assembled a few boards using this regulator, ...
0 votes
1 answer
110 views

What's the simplest way to produce 150VDC for activating my piezo stack?

I recently bought a piezo stack for research purposes. To activate the piezo stack and get the maximum stroke I have to supply 150VDC. I want to use the piezo stack in two states only: 0V and 150VDC. ...
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2 votes
2 answers
359 views

High voltage, high current buck converter/ DC-DC converter

I am in the process of designing a circuit to regulate voltage going into and electric motor. Vin ~= 52v-45v @100A and the motor requires 45V @100A. Is this possible? I haven't seen designs even ...
0 votes
1 answer
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Why does PMIC temperature increase drastically when opamp gain is increased?

I have an RF signal conditioning circuit that uses two AD8065 opamps for coarse gain. The board is powered via +/-12V, and is stepped down to +/-6V using MC7906 and MC7806 PMIC. The gain is controlled ...
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2 answers
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Applying 5V on output pin of LM7805 while the regulator is not powered

According to the Datasheet of LM7805 (section Application and Implementation), in some scenarios a protective diode (between IN and OUT pins) is needed to protect the regulator. Please take a look at ...
6 votes
5 answers
1k views

How can I achieve full scale deflection on a 30 A ammeter with a 5 V voltage?

I have a vintage 0-30A DC ammeter (picture below) and I want it to display my PC's CPU usage for a DIY project. After doing a bunch of research, here's how I would do it: The PC will send CPU usage ...
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2 answers
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In what conditions can a DC isolated power supply generate a higher voltage at the flyback transformer's secondary side?

We have designed a passive PoE isolated power supply using a TOP268 converter. We are converting 48 V DC PoE input to 12 V/1 A output. This 12 V output we are feeding to a step-down power regulator ...
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0 votes
1 answer
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L7805CV operating temperature

I have an L7805CV powering an Arduino and a serial communication chip from a 12 V supply. Nothing else is powered by the L7805CV as the LED strip is powered via a TIP120 transistor and 12 V. However, ...
1 vote
1 answer
98 views

Is it dangerous to charge gadgets at less than 5 V?

I'm using a solar panel, which gives me unstable current (from 0 to 9 V approximately), then I use a step-up converter to increase te voltage a little (my goal is to keep it between 7 and 12 V in ...
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0 votes
1 answer
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Step up converter with MC34063

I have a 24v humidifier that I would like to power using a 12v power supply, so in order to do that, I designed a voltage step up regulator based on the MC34063. But since the humidifier requires a ...
0 votes
1 answer
33 views

How are AC voltage regulation and overexcitation both accomplished in an AC synchronous motor?

Help me see what I'm misunderstanding here. I see a contradiction between the following two principles: An AC voltage regulator attached to an AC synchronous motor will regulate terminal voltage. If ...
0 votes
1 answer
80 views

Driving a p-channel MOSFET with a n-channel MOSFET

I want to use a p-channel MOSFET to turn off and on the power to a 6 V l7806 voltage regulator that powers a 6 V servo. The reason is to save battery power. The controller is a 5 V Arduino. It is my ...
1 vote
1 answer
56 views

Powering Pico and stepper motor though solar panels

The main question: Should I power the motor and Pico with a separate set of solar panels or is it solvable in one circuit? Explanation: I am not a total beginner, but did not do electronics for about ...
2 votes
3 answers
163 views

Building a solid state regulator for a vintage 6 V dynamo

There was a great discussion back a few months ago on building a regulator for a dynamo. I have a similar challenge except the vintage motorcycle I'm restoring is a racing machine - neither lights not ...
7 votes
6 answers
2k views

How can I drop the voltage of a 5V DC power supply from 5.5V to 5.1V?

I have some LED matrix panels (64x64) that appear to be super sensitive to voltage. Higher voltages introduce noise. I have a handful of 5 V, 10 A "brick" power supplies like this one. The ...
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2 answers
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Help me understand the calculation of the current consummated by LM7805

Please help me understand how to calculate the current consummated by LM7805 during its work. Parameters: V(in) = 12V V(out) = 5V I(load) = 10mA (0.01A) The image ...
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0 answers
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Adding max current regulation to outlet of voltage regulator

Hello I have the following circuit that I'd like to use to charge a battery. The battery is specified to charge up to 12.6V max and so I have implemented a voltage regulator that will produce this ...
0 votes
1 answer
52 views

12 V regulator from 13+ V

I have a fairly good understanding of electronics, but I wanted to check that my solution to the following issue is correct. I have a travel trailer with a lithium battery bank (voltages range from 12....
0 votes
2 answers
59 views

On a 12 V car alternator with possible failure of the rectifier diode causing drainage, could an electronic component be added in-line near battery?

On a 12 V car alternator with possible failure of the rectifier diode/s causing drainage, could an electronic component be added in-line near the battery? Such as a voltage regulator or diodes in line ...
0 votes
1 answer
51 views

Temperature stable PSU

I need a cheap power source (5V 1A approximately) that is temperature stable to about 20ppm/degC. I note that voltage references with this kind of stability are cheap. However, is it possible to use ...
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1 vote
3 answers
122 views

Do I need decoupling capacitors with a low dropout (LDO) regulator?

As far as I know, normally when you directly supply the circuit, it must have decoupling capacitors to deal with noise. If I use an LDO instead of directly supplying it, do I need to have decoupling ...
1 vote
1 answer
72 views

Using NiMH batteries with dumb charger designed for NiCd?

I'm attempting to revive a very old calculator that was designed to use NiCd batteries (no clue about capacity). These batteries act both as a power source but also as a voltage regulator. Charger is ...
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