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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53 views

If Voltage determines current , a transformer regulate current?

Well , a transformer can regulate the voltage , increasing and decreasing it . And , if the voltage increase , the current too . So... a transformer regulates current too right? Sorry if its a ...
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20 views

Can Qualcomm Quick Charge Charger Charge 3 18650 cells in series

Please may I ask : can quick charge charger charge batteries in series ? Say 3 series of 18650 batteries giving about 12.6 volts; can your quick charge adapter charge it just putting it in series ? ...
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Powering small DC load ( 1W ) using 220V AC supply

I am trying to design a small control circuit for controlling large currents (not too large, around 200W, AC 50Hz). I have kept in the AC circuit isolated from the DC control circuit. But the problem ...
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59 views

Can a AMS1117 fixed voltage regulator be used in a reverse biased way?

I was looking at a breadboard power module (link). This board has two inputs: a DC plug (7-12V advised) and a USB mini (5V). Using either of those two inputs, the board provides two voltages (3.3V and ...
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Why is the volatge fluctuating at the output pins of my dc-dc xl6009 voltage booster in a powerbank using tp4056 module?

i m making powerbank using tp4056 module and xl6009 dc-dc voltage booster . i have connected a usb type a female for output but my battery notification led is fluctuating because of voltage ...
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52 views

Voltage comparator

I have a circuit where I have to read high and low logic level through a micro-controller. Condition: When the input voltage is above 15V, it should be HIGH logic (2V to 5V.) When the input ...
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31 views

230VAC to 30VDC/6A power supply

I am working on a lab bench power supply capable of 30V at 5A. It is a linear PSU so therefore i will need 30VDC to feed into a regulator (5x LT3080 in parallel). I think that 1A is enough for the ...
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40 views

Input Capacitance in LM 2596 Step Down voltage regulator

What is the significance of the input capacitance (680 uF) (uF = microFarad) at the input of the LM 2596 ? LM 2596 is step down voltage regulator. Please refer: http://www.ti.com/lit/ds/symlink/...
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81 views

Step by step explanation of voltage regulator

Let's consider this basic scheme of voltage regulator (here the reference): I wanted to verify that a sudden variation of the output voltage is compensated by the circuit. Suppose that the output ...
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52 views

LED downlight current (amp) usage

I need advice on how to build a battery powered light setup in my house with what I have. Please be kind as I am a DIY newbie when it comes to off-the-grid solutions. Equipment: 1 x 12volt 36Amp ...
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30 views

Resources to use to learn the nitty gritty details of linear voltage regulators and how to use/ build them

For my current project, I need to regulate a 12V DC power supply to 5V DC, and I've chosen to do so via a linear regulator. While tutorials exist online, they—to my knowledge—don't go over the ...
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which kind of design of level shifter suitable for high frequency data transfeing in range of 1MHz?

A circuit needed to convert 3.3V and 5V logical voltage. However, the issue was that the circuit was supposed to handle very high data transfer at or above 1 MHz and up to 16MHz. I thought of ...
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47 views

Voltage regulator between two circuits [closed]

I am pretty new to electronics and got stuck on a probably very easy issue, however I could not find a proper answer for it on google. Basically, I have 2 circuits, one, which operates on 24V, and an ...
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44 views

Using Buck converter and LDO from the same power source

I'm designing a device with several ICs and they require so many different input supply voltages. 18V, 12V, 3.3V, 1.8V 1.3V. 18V will probably use around 80W out of 100W(20V, 5A) main supply budget ...
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LM7805 regulator IC heating up at no load

I have connected two LM7805 ICs with same inputs and grounds to a 7.4V battery but different outputs, also placing the capacitors of 3.3 microfarads and 1 microfarads (since I didn't find 0.33 and 1 ...
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1answer
52 views

Help identifying components in schematic for HT9032

I'm new to electronics and hoping to make a caller ID interface using an HT9032C or HT9032D to do the Bell 202 FSK demodulation. However, I'm having a problem understanding the example application ...
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2answers
65 views

Is there any relation between the output voltage stability and the choice of resistors for this adjustable regulator?

The following LM317 adjustable voltage regulator example uses R1 & R2 to adjust the output voltage: And the datasheet for the output formula is given as: Now instead of using R1=4.2k and R2= 10k ...
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1answer
98 views

Linear regulator heats up at 60 volts

MY goal is to design a regulator which could receive (12 V to 60 volts DC as an input) and 5 volt with 60 to 70 mA current as an output. The reason I used three BJT's NPN (Q1, Q2, Q3), so I thought I ...
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1answer
62 views

What is wrong with this LCD backlight boost converter circuit

I have been working with a dev board with the LCD backlight circuit shown below. The boost converted used is the TPS61041. On page 18 of the datasheet, there is an example of the backlight circuit ...
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2answers
68 views

79XX datasheets show differing capacitors on input and output. What is correct values and types to use?

I am making a power supply using a 7812 and 7912 regulator. It's 24 VAC in through diode bridge, resulting in about 18V positive and negative. I'm planning to use a 1000 uF capacitor on each side and ...
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30 views

LM2576-X library for Proteus

I'm using proteus 8.9 SP0. Is there any library for LM2576-X (x = 3.3, 5, 9, 12, 15)? I have LM2576-ADJ (adjustable) but I need fixed voltage series.
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5answers
103 views

Can I use a low dropout voltage regulator to drop a 5V 100 nSec pulse to 3.3V?

I am using an analog switch IC with 3.6V as a maximum operating voltage. The input to the analog switch is the output pulse from a multi-vibrator which is 5V and 100nSec width. I need to drop the ...
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2answers
68 views

Misconceptions about layout of DC to DC step-down converters

I have noticed, in my opinion, some misconceptions in the layout of the majority of DC to DC step-down converters. I've seen in many PCBs that the trace that goes to the input of the converter (point ...
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47 views

Output current of LM338T

I tried voltage regulator using LM338T. It is okay to regulate the voltage but when I measured the output current it gives me around 1.5 amperes, not more than that. But datasheet specified it can ...
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2answers
44 views

LDO Voltage Regulator - Will there be an issue

I am working on a design that utilizes a LDO Fixed Voltage Regulator. The voltage in is 24V and expected voltage out is 3.3V. I know the part is spec'd for 24V (Vin-max) and output of 3.3V, but should ...
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HowTo create an accurate constant-current dummy load using immersion heaters controlled by Arduino?

Given: variable sized nominal 3.2V LI/LFP battery cells, from little 18650 / 26650 cylindrical A123s up to large prismatics from CALB / Winston etc. the desire to capacity-test them off grid (no ...
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1answer
87 views

Zener voltage clamping

I would like to understand how a zener diode clamps the voltage. I1 = I2 + I3, in order to calculate I2 I need the zener's resistance which is not doable since it is not a resistor. However I don't ...
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37 views

AC Dimmer circuit with MOC3021 & EL817 along with ESP8266 (NodeMCU)

Major two issues/question are here: 1) The challenge I am facing is, my interrupt is not working. 2) do I need to include a Heat Sink in this? Hello, I am quite ...
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36 views

LT3015 not regulating

I designed a simple circuit around LT3080 (positive linear regulator) and LT3015 (negative linear regulator). LT3015 datasheet I'm feeding them with +19V and -19V (input bypass caps not show) the ...
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38 views

what is the Lt1086-5 Vin min?

I have LT1086 5V regulator what is the Vin min to provide 5V output?( assume load current 500mA -800mA) I tested it worked for 6V Vin, but datasheet does not mention anything about Vin min https://...
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62 views

What is the difference between pulse-skipping mode and burst-mode in power converters?

I have been looking at methods to regulate a resonant converter which switches from full load to zero load at rates anywhere from 100Hz to 100kHz. I am looking online at some journal/conference papers ...
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58 views

how to calculate rms value for current square wave

How do I calculate the RMS value for the current waveform during a transient event like the picture below? Assuming: Ix=6A Iy=38A duty cycle= 38% frequency= unknown My goal is to know what is ...
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23 views

Calculating load regulation in this zener diode circuit

I'm trying to find a good method to calculate the following two values of the circuit below: $$\bigg(\frac{dV_L}{dV_S}\bigg)_{i_L=constant}=?$$ $$\bigg(\frac{dV_L}{di_L}\bigg)_{V_s=constant}=?\\ \\$$ ...
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1answer
37 views

Leading edge blanking does not depends on primary leakage inductance?

Here are the following advices for designing the leading edge blanking of a flyback converter. There is also the schematic: It tells us that there is reverse recovery current which occurs from the ...
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1answer
85 views

Short circuit protection of a controller for flyback converter

I would like to have your opinions about this short circuit protection. Here is the schematic associated given into the datasheet. And you can find into the same datasheet how their short circuit ...
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3answers
157 views

Regulated power supply 1,5-34 V ~ 40A using LM1084ADJ and TIP122

I would like to create a simple (not very fine tuned) regulated power supply in which with two potentiometers. I want to adjust the voltage from ~2V-34V, while the output of my 24 V transformer ...
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2answers
72 views

Linear Voltage regulator becomes very Hot when connected to Nichrome wire heater

I'm trying to build a heating element using nichrome wire 24 gauge. I'm using a 12v linear voltage regulator (L7812CV) as a power adopter which is connected to a rectifier bridge providing 19v. When ...
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492 views

Current mirror: is there a name for this NPN-PNP pair, and how does it work?

I'm looking at the schematic for the MC1460 voltage regulator. At the top it has three current mirrors, each with an NPN-PNP pair. Is there a name for that transistor structure? These pairs look like ...
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2answers
96 views

26 Led Array Component Identification and Failure Cause

I have the following LED lights. These lights keep failing on me. I'm suspecting that the DPAK(U1) component is failing but I have no clue what it is. The markings on the DPAK reads 5ZYl8GF6D. I'm ...
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0answers
53 views

Considering the inductor in a buck DC-DC converter, how to compute the current through it?

I've been stuck for a few days to the very first point of a lab in which we analyse the behaviour of buck and boost converters. The circuit is built by the university I study in, so there is no acutal ...
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4answers
164 views

MCP1700 voltage regulator instantly overheats and starts to smoke, no load

Newbie question. I have a MCP1700-3302E LDO voltage regulator to power ESP8266 using a 3.7V battery. However, as soon as I connect the negative lead to the ground pin and the positive to Vin the ...
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4answers
67 views

Is it OK for capacitor voltage rate for this circuit?

I have a DC-DC buck converter circuit. C5 capacitor in this circuit is 10uF with a voltage rating 10V(only available for me ). is this circuit work as normal with 24V input?? or damaging c5(when ...
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5answers
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LM7805 heating up

I maked a schematic for trigger a siren 12v by a signal from Raspberry Pi (GPIO18 PWM 3.3V). All the circuit is powered by a power source of 12v 15A (see the image below). SCHEMATIC UPDATED: It's ...
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1answer
65 views

Is this regulator a suitable replacement for original one?

I am fairly new to electronics and have done my first project successfully (where it works as assembled PCB). And I am looking for the next step there. In my original project I've used SPX3819M5-L-3-3 ...
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1answer
52 views

LM317 - voltage limits

I have a couple of active PA monitors with only unbalanced inputs. I want to be able to use the balanced monitor outputs from my mixer, so I am planning to build in a balanced to unbalanced converter ...
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1answer
60 views

Controlling high voltage pulsed load

I have designed a power supply that has two outputs, one at -3kV (200mA) and one at -6kV (10mA). A new design challenge has arisen that includes the need to pulse both of the outputs from nominal load ...
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1answer
105 views

5A constant current/ constant voltage using LM350

I take the circuit below given in a TI application note, and I have some questions about the way the circuit works: The circuit is designed as a 5A constant current/constant voltage regulator. First ...
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0answers
27 views

NodeMCU - Are all GND connctions born equal?

I'm designing a PCB which is based on NodeMCU board in its core. On NodeMCU there are some GND pins, most of them are to serve digital outputs/inputs, or external sensors which operate on 3.3V. Vin ...
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2answers
159 views

How to choose the series pass transistor?

I plan on using the LT3080 to regulate a variable 1-36V 7A DC power supply. This regulator by itself will not provide more than an amp or so, so I will have to use an external series pass transistor ...
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1answer
47 views

1V voltage reference and temperature coefficient

There are precision 1V voltage references like ADR510 which I don't have access to, though I do have LM385 1.2V, LM336Z5 5V and the famous TL431 at hand. The easiest solution is to use a voltage ...

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