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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47 views

Need design best practice: microcontroller controlled, variable, DC voltage source

I need guidance on designing a Variable DC power supply with the following characteristics: Microcontroller controlled DC output ~ 1V - 30V Current handling: ~5 amperes Power handling: ~50 watts I ...
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41 views

Calculate the minimal MOSFET source current needed for 12 TTL MOSFETS

This is definitely a beginner question as this is the second PCB I ever designed but you can't learn unless you do something. (It's an optimization of an older board I have to do as project.) I would ...
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84 views

AMS1117-3.3 outputs 4.4 V from a 5 V supply

[disclaimer - I am new in DIY and this is the first PCB I designed myself] I designed a PCB for a very simple ESP8266 12-F + RGB LEDs project. I assume that I am doing something fundamentally wrong ...
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22 views

L298N Module 5V pin behavior on above 12V power supply

I have a lead acid battery that is barely above 12 volts (at 12.6) volts. This seemed enough to trip the switch in behavior that changes the 5V pin from output to input in the L298N motor driver ...
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Usage of LM 723 as High Voltage High Current voltage (HVHC) regulator, High Voltage Low Current(HVLC) and Low Voltage High Current voltage regulator [duplicate]

I have been asked to make a presentation on LM 723 as High Voltage High current regulator and high voltage low current regulator(I know the ic is way too old but its in our university syllabus so I ...
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41 views

Pulling different voltages directly from AA alkaline cells wired in series

I need to power a miniature LED light show that will draw a few hundred mA, or possibly more, and requires less than 5 Vin, and a microcontroller board that wants 7-21 Vin. I was thinking the easiest ...
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576 views

Why is my low dropout voltage regulator Diodes AP7370 burning up?

I'm building a LED driver using Diodes AL8871Q IC to power a XHP70 LED powered from a 4 series protected Lithium battery pack, integrated on the board it has an Attiny85. I plan to use the Attiny85 to ...
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2answers
80 views

Search for the most efficient voltage regulator on low current consumption

I'm currently designing a circuit for a long term device that will consume 1-2mA at 3.3V constantly. The system is run with a default lithium polymer battery and I need to get as much time out of it ...
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46 views

Does the lm317TG require a load resistor in the final design or just for testing?

I'm building variable voltage regulator, the regulator has levels of 9, 12, 15 and 18 volts and a potentiometer that allows for incremental adjustment between the levels, so at level 18v you can drop ...
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220 views

lm7905 LTSpice is not working

I have downloaded the lm7905 from this source: https://github.com/kafana/ltspice-misc/blob/master/models/regulators.lib unfortunately, it seems that the output voltage is 0mV all the time (the green ...
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Real life applications of High Voltage Low Current and High Voltage High Current voltage regulators using IC 723

I am looking for the real life application of HVLC and HVHC voltage regulators using IC 723 for my college presentation. I tried looking up for it but couldn't find something. So can somebody help me ...
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Understanding power ratings

So my previous question here confirmed what I thought, to calculate the power dissipated in a component, take the voltage across the device and multiply by the current. But why do some devices have a ...
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59 views

Thermoelectric Generator Schematic

On my other question I asked about how could I regulate a TEG like this: for a 12 V, 10 W load I have. My first idea was to use some resistors, a zener diode and a linear voltage regulator. But ...
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49 views

Regulator output capacitors placement

I'm using a TPS63060 regulator and according to its manual there should be typical 66uF capacitance on the output, please see this screenshot: In order to achieve that I'm planning to use three 22uF ...
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42 views

Power Regulation 12/24V to 12V, 5V, 3V3

I am looking for a smart way to regulate my input power Vin = 12-24V to a stable Vout = 12V; Imax = 3A- Usual I use the TI Workbench but this time it makes really complex designs. On the Load side ...
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37 views

Providing regulated voltage to a DC solenoid over a long small gauge wire

I have a bank of 12VDC solenoids that I would like to power from a controller that is 1000+ft away (length of the wire is variable). Larger and larger wire diameter is an option, but costly. These ...
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105 views

Reduce 2.503V regulated voltage by just about 3mV

I have a handful of REF192GP reference voltage sources. They are specified to produce a relatively precise 2.5V. Measuring each device I typically get a few mV higher than 2.5V, for example 2.503V. ...
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46 views

Input transient voltage of a regulator

I am using a regulator in a design. The regulator gives 5V output with 9V to 60V input. The datasheet says that the input transient voltage is 80V/second. Does this mean the regulator can handle an ...
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49 views

I had 12 V solar inverter but my solar panel is 24 V, 10.5 amps [closed]

I had 12 V solar inverter with 35 amps, but my solar panel is 24 V with 10.5 amps. Output at max power is 42 V. I need to reduce the voltage to 12 without reducing the amps. I am new to electronics. ...
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1answer
41 views

Thermoelectric Generator Impedance Matching

I have a TEG that has an output IxV curve like this: That should mean something like this: I need a simple circuit to regulate the voltage around 12 V while enabling at least ~10 W for some load I ...
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50 views

How to use the enable Pin and Error Flag Pin of MIC29301 12V regulator with an Arduino

I am completely new to electronics and I am looking to implement a simple 12V Vacuum Pump power and control circuit with an Arduino. I chose the MIC29301 as the 12Vout regulator to be directly ...
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3answers
73 views

24 V DC to 5 V DC converter for Pi 3B

I set up an Octopi system for my 3d printer. I would love if the Pi turns on together with the printer. The printer PSU outputs 24 V DC and has a couple extra terminals. So to save a plug I would love ...
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216 views

Super easy 5V to 3V conversion?

What is the absolutely simplest way for a 10 year old child (not really) to get a 5V (350mA) phone charger to power an LED (3.0V) and a clock (1.5V)? The clock is meant to run on a 1.5V battery, but ...
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66 views

Power supply protection

I'm trying to create a power supply protection (overvoltage, undervoltage, reverse polarity) for a ±33 V, 7 mA power supply for an op-amp. The opamp would be powered by a lab supply in theory. So the ...
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1answer
94 views

How do you regulate a car battery down to exactly / not more than 12V?

My problem: I want to light up the inside of transporters with a 12V LED strip. But I don't think powering it with the 12V car battery directly is a good idea. Although the name implies 12V, a car ...
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30 views

Calculating Iadj for voltage regulator

I am attempting to control Vout to 3.8V and have selected ADJ regulator as my regulator. According to the circuit below, I need to calculate what R1 and R2 should be to get the desired Vout, Vin ...
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51 views

Square wave voltage regulator

I wanted to build a simple amplifier for a square wave generator with the following configuration: The presence of the amplifier is crucial since with my 12Ω load the output peak current may be near ...
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1answer
56 views

Dc to DC converter: “split” one power supply (24V, 5A) into four power sources 5V, max 3A

I have one DC input 24V, 5A. I have designed a 4 channel led driver using the PAM2804 for Cree RGBW leds. I am using 3 of them. So, 3 Rgbw leds, and 3 led drivers. I need to be able to control ...
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1answer
93 views

USB and Battery switching circuit not working [and buck boost converter not working either]

I am an absolute beginner when it comes to electronics and this is my first circuit, so please excuse my ignorance and thank you for your patience and help. I am trying to build a circuit which ...
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49 views

Choosing the right voltage regulation - 12/24V to 5V

for my projects I always come across the power part which kinda bugs me. Usually i just open the TI webbench, put my parameters into and take whatever he gives me. But is that the right/good way? Why ...
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22 views

Vestax PMC-07 Mixer PSU

I'm trying to fix a Vestax PMC-07 Mixer and I'm puzzled by the schematics. It is fed by a single +12V wall-wart switching adapter through a DC Jack. Can this configuration really produce a negative ...
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82 views

Can I use 2 LM317 cascaded?

I have a 20 - 0 - 20 transformer which is giving about +-27V after rectification. I need +20VDC, +16VDC, 5VDC and -20VDC. I thought of regulating from 27 to 20 then 20 to 16, and finally 16 to 5. Will ...
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27 views

Using VBUS instead of the USB port to power a MCU

I'm using an EK-TMC123GXL, for now powering it from the PC. I have found some problems with some pins (ADC, PWM) that doesn't arise if I power it up applying 3.3V to its VBUS pin instead of connecting ...
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71 views

Lowering voltage in a circuit to spin fan more slowly

first post here! [DISCLAIMER] I know little to nothing regarding electrical engineering, I am already in the process of buying a good book to start off, but this issue would need to be solved quickly, ...
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3answers
57 views

Can LC filter at the input of the switching regulator cause problem?

The system I designed uses switching power supply Microchip MCP16311 for operation. The problem is that during Run test, which i let the board communicate with other system via Modbus, the ...
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48 views

Can batteries connected in series be treated as separate voltage sources?

I'm working on a project where one module will run on 6V and another on max 5V. As voltage source, I use 4xAA batteries (so 6V in total). My initial idea was to use a zener diode to limit the voltage ...
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61 views

DC/DC step down timer

I need simple circuit that can provide step down of voltage after some time. For example after connecting 24V, on output there will be 24V for 500msec, after that voltage will step down to 8V and stay ...
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1answer
69 views

Using a diode to protect a voltage regulator

I am trying to power an ESP32 devboard from 12 V. My first attempt was to directly connect the 12 V to the 5 V connection, because the ESP32 devboard employs an 1117 3.3 V voltage regulator anyway, ...
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1answer
57 views

Designing a DC stage for a mixed signal board

I am working on a board that contains a DC stage, an SBC module, mechanical relays (smd) and communication modules. The power supply is a cheap 24v AC-DC converter. It is a COTS product. The DC stage ...
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Why recommend tantalum over ceramic capacitor for voltage regulator? [duplicate]

The LM1117 voltage regulator datasheet recommends using tantalum capacitors on the input and output. What is the reason for this? What advantage does tantalum have over a ceramic capacitor? A 10μF ...
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2answers
89 views

Charging mobile with solar panel Issue

I want to charge mobiles using a solar panel. Most phones would charge well with 5V 1A/1.5A. My panel specifications are as follows- Key points: Maximum power 10Wp (peak wattage) Voltage at maximum ...
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70 views

Why does my MOSFET only allow current when it is switched polarity (drain to GND)?

This circuit acts strangely. I think the MOSFET is correctly placed. However, whenever I connect it to the power supply (1V 0.1A for initial testing) it doesn't let any current through - unless I ...
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39 views

1 voltage regulator for all components or 1 voltage regulator for each component?

Is it a good idea to only put 1 5volts regulator to power all components or 1 5volts regulator for each component? If I only put 1 5volts regulator to power all the components would that affect, ...
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153 views

Is it possible to power a monitor with 5 V if the power supply specification is DC 9-36 V?

I'm attempting to turn an NES clone into a handheld device, therefore adding a power supply and a monitor as well as a few other minor things. After some research, I pulled all the parts together I ...
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Resistor in shunt regulator not following Ohm's law?

I was reverse engineering a power tool battery charger (21V SMPS) that derives its 5V rail from a simple shunt regulator, employing a TL431 programmable precision reference and a NPN transistor, as ...
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LM2576 vs modern step-down switching regulators - EMC requirements and other differences

I'm looking for some cost reduction in my design and I want to replace TPS54302 with LM2576 or LM2575. In my case - switching regulator works as a pre-regulator with 12-24V input and ~6V output, ...
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45 views

Isolated DC supply for Bluetooth receiver in car audio

This question is about the isolated power supply I've put together for a Bluetooth receiver which is going into an old car stereo, replacing the cassette... The Bluetooth device wants isolated 5vdc, ...
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2answers
67 views

Idiomatic way to control output voltage of buck/boost converters using microcontroller

I'm trying to design an appliance that efficiently regulates power to some Peltier elements. The manufacturer states that optimally, you should drive these with regulated voltage and not PWM. They ...
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3answers
108 views

LDO that doesn't drop out?

I have a scenario where my Vin is 12VDC and my (small inductive) load is 7VDC. I need a voltage regulator that would satisfy following conditions: if the Vin > 7VDC + Vdropout, then Vout = 7VDC if ...
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105 views

LM317 Voltage Regulator

I want to regulate a voltage suppose 60 V, but I only have an LM317 (or any similar voltage regulator IC) with voltage regulation range of 30 V max. Is there any way I can use a combination of two or ...

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