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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Regulating Minimum Voltage

Is it possible to construct a circuit that outputs a voltage of 0 below a certain threshold , similar to a Schmitt Trigger, without using op-amps? In my circuit I want to prevent input voltage below ...
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17 views

LTC1871 max current

I need a step up converter for a project, and I found the LTC1871 from Linear. However, the current flowing through that IC can be as low as 0.5A, and as high as 10A. Would the LTC1871 be suited for ...
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1answer
43 views

Excessive Boost Converter Output

I'm implementing a boost switching regulator based on a Texas LM5002 chip (datasheet), to get about 65V from a 12V supply. The design I've arrived at is shown below, inspired both from the data on the ...
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21 views

connecting lipo batter to raspberry pi

battery: LiPo 11.1v 30C 4500mAh Raspberry Pi: 5v usb I had a 7805CT regulator laying around and I'm pretty sure I can use that to regulate power to my RPi from the LiPo but there's one problem: ...
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1answer
40 views

Voltage regulator VS power supply

I made a circuit with some components (arduino, wifi board, ultrasonic sensor, sound sensor, light sensor, temperature sensor, humidity sensor, some leds and other components) on a breadboard. The ...
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1answer
62 views

LM7805 voltage drop when attach load

I've designed a circuit that I've already had tested it on breadboard and it has worked fine. When I did it on a PCB a new issue has appeared. The voltage regulator (I'm currently using a 7805) gives ...
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1answer
57 views

Power feeder scheme adaptation

I'm trying to change the voltage regulation circuit in order to obtain a different range of voltage. My feeder uses a diode bridge and a transformer, that are not displayed in the scheme(it works). ...
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25 views

Arduino Uno/Multiple Servos - Single Power Source

With full disclosure, I am a noob at this, so please be gentle as I have researched this across multiple boards and am frankly confused by the answers: Short Version: I have built an Iron Man Suit ...
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2answers
66 views

How do I solder a surface mount (smd) voltage regulator?

I have a PCB in front of me with a surface mount 5V voltage regualator. I'm wondering how I got about soldering this with just solder (I don't have paste). I have heat paste, but I'm wondering if ...
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2answers
59 views

How to design capacitance value for a given full wave rectifier [duplicate]

I have been searching for design equations for 5v regulated power supply but unable to figure it out. Please check the below circuit diagram Could anyone explain me why 470uf ? why not 2uf? how can ...
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1answer
63 views

How to prevent DC motor from dropping voltage of supply when switching on

I have a circuit which uses an ATtiny85 output to a transistor (S9013), which will trigger a relay that controls a motor. The reason for the transistor to relay is because I do not have a transistor ...
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1answer
60 views

L705CV Voltage Regulator Overheating [duplicate]

The L805CV voltage regulator is capable of producing a consistent 5v 1.5A draw. I am creating a small raspberry pi case and have a 12v 3a power supply to accomplish the project. I am powering a 12v ...
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1answer
64 views

Current transformer

I just made a current transformer with 250 turns secondary, with a toroidal ferrite core (2cm inner diameter). I want to measure ac current consumed by a 60W bulb. Now Ip = 60/220V = 0.2727Amps.. will ...
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1answer
54 views

Solar panels not charging batteries

Please help or assist in my charging issues. Firstly I am running 5, 200W 24V panels which are wired in parrael with all panels fused. Solar regulator is PWM 50 amp unit. Battery bank, I am running ...
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4answers
110 views

Connecting two power supplies with same voltage rating to increase current output?

My h bridge requires 5v 1 amp. I have a 5v 500mA and another 5v 850mA power supply lying around. Can I join the +ve of both and send that signal to the h brdige so that it can have enough current of 1 ...
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2answers
71 views

Beaglebone black gets shutdown signal when I move rc motors

I have a beaglebone black that I tucked inside an rc truck. I removed the radio control chip. Everywhere it had 3.9 volt logic I put in a 3.3v gpio control from the beaglebone. It works great I'm ...
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2answers
60 views

Reduction of DC motor noise

I am designing a circuit with a DC motor (http://www.jaycar.com.au/products_uploaded/YG2732.pdf) and some other stuff including a MCU and a LASER, all driven from a single 12V source and am concerned ...
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1answer
67 views

Should I use a voltage regulator?

I'm powering an attiny45 from a single lithium ion battery; that when fully charged should have a maximum voltage of ~4volts and will be cutoff at 3volts. I was thinking I should be safe to just ...
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1answer
64 views

Battery power to 5v led strip and 3.3v controller

I'm trying to build a wireless led strip using the esp8266 controller and ws2812 addressable led strip using battery power, but I'm a bit stuck on how to build the circuit. After a bit of research ...
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1answer
81 views

Choosing a linear regulator vs. switching regulator for low-power application?

I have a 3.6 V battery that I want to regulate down to 3.3 V and 1.8 V rails. I have already asked about the configuration of the two rails here. My question here however is whether I should use a ...
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2answers
74 views

How to regulate a 3.6 V battery to two power rails (3.3 V and 1.8 V)?

I have a 3.6 V battery from which I need two voltage rails, one that is 3.3 V and one that is 1.8 V. How should I design this circuit such that it is the most power efficient? Here is what I was ...
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2answers
53 views

Reduce silver oxide battery 1.5v to 1.3v

I am looking to reduce the voltage of a silver oxide battery from 1.5 to 1.3 volt for a Bulova Accutron movement. The watch movement uses approx 4.5 to 7 micro amperes. I have used the formula for ...
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3answers
91 views

Providing a linear adjustable DC voltage from PWM ( 1.5V to 3.3V)

first of, im not an electrical engineer, so a simple task has me baffled for the last week or so. I am working on project where I am requred to feed a blackbox device with a stable adjustable ...
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2answers
60 views

Help to identify voltage regulator from markings

I have a regulator on an Arduino Mini Pro board (Chinese clone) which should be a 3V3, but it seems it's a 5V one (by measured voltage). The markings on the component are BALG. Does anyone know what ...
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63 views

Voltage Regulator Alternative [closed]

I want to use 5v from a 9v battery to charge my mobile.But i dont have a 7805 ic (voltage regulator).Is there any alternative? Thanks in advance.
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3answers
211 views

LM317 voltage regulator short circuit

I made this standard LM317 voltage regulator circuit: It worked as expected, but then I tried connecting a TDA2005 audio amplifier. I connected the LM317 to my audio amplifier as a power supply and ...
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29 views

LM317 voltage regulator short circuit [closed]

So I made this standard LM317 voltage regulator circuit. It worked as expected, but then I introduced a TDA2005 audio amplifier. I connected LM317 to my audio amplifier as a power supply and, because ...
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1answer
47 views

Voltage regulation vs relative voltage tresholds?

There is a part of my circuit that uses resistance to output a voltage, in which is compared to a voltage threshold to output a digital signal. However +Vcc can vary and any voltages too far from 5V ...
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1answer
46 views

Power circuit design logic — suggestion

I am designing a board where my Microcontroller is powered by LM7805 regulator & my load requires 3.8 voltage, is powered by following voltage regulator NCP57302. ...
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2answers
78 views

Voltage regulator capacitor size

I want to use a LF33 voltage regulator to power a nRF24L01 module from a Arduino Pro Mini. I plan to power the Pro Mini with a 9V battery, then use it's 5V internal regulator to power the LF33 which ...
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1answer
63 views

How to activate relay when voltage rise threshold is reached

I've made a basic AC-to-DC converter, 120vac in, 120vdc out, used for backup power to run a 120vdc deep-well solar-electric water pump when the sun isn't shining. The AC power source for this backup ...
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3answers
105 views

How to find the positive wire on wall charger

i have a TPLINK wall charger from my old router. It's almost new and i would like to use it for my 5V regulator project. The prboem is that i dont know which of the 2 wires is positive and which ...
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1answer
115 views

LTC3355 backup DC/DC regulator output voltage sags under load in boost mode

Background For a hobby project I have designed a board using the LTC3355 DC/DC regulator to work as a power supply. I am a software engineer by trade, and I am thus totally underequipped to properly ...
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1answer
118 views

Reducing EMI Radiated & Conducted

I have a switching regulator that operates at switching frequency of 260Khz that steps down a 28vdc to 3.3Vdc. The switching regulator output will supply current as high as 1 amp for the initial 5 ...
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2answers
83 views

DC-DC converter topology

Is it possible to build a DC-DC converter by means of a piezo crystal followed by a voltage multiplier? The crystal would supply the AC voltage needed by the voltage multiplier. I'm looking to get ...
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1answer
51 views

Connecting a +12V DC wire to a Voltage Regulator with 4 pinouts

The voltage regulator I'm using has 4 pins (2 in, 2 out) pictured below. The reason I purchased this regulator is that I want to convert +12V DC in to +5V DC current for connecting a Sony Projector ...
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34 views

Discarding Current Monitor of Linear's LT3482

I've been looking at the LT3482 IC with an APD/Photon Counter application in mind. I need to bias my APD at something like ~65V to reach Geiger mode. Since I've already have a non-inverting ...
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2answers
71 views

Converting Voltage [duplicate]

I have a pair of batteries that can operate at 7.2V (series) or 3.6V (parallel) and I need to power up a device using 5V. I can use a Voltage Regulator to down voltage at 5V or I can use maybe ...
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3answers
128 views

What is the minimum supply voltage for the MC34063E in step-up (boost) configuration?

I need help determining the minimum supply voltage specification for the MC34063E in step-up (boost) configuration. I can't tell for sure by reading this datasheet. First, on page 1 they say: ...
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1answer
47 views

Enable pin with maximum 3.0v

I've an Enable pin active-high that have maximum voltage rating of 3.0v, but I use a 3.3v MCU outputs. I've also a 3.0v voltage regulator on board. Should I use resistor voltage divider or there is a ...
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1answer
54 views

Beginner PCB Repair - Voltage Regulator Issue

During a fault finding mission on my car I found the Vref on a sensor that should be 5V sitting over 7V. I traced it back to one of the modules and found the pcb mounted voltage regulator was ...
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1answer
100 views

Why use two power sources when designing a voltage regulator using a zener diode

I am currently designing a voltage regulator using a 5V zener diode. I am wondering why some people choose to use two power sources instead of one, what would be the benefits of this ? the circuit ...
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2answers
143 views

Voltage regulator from 24v to 3.7v [duplicate]

I need to build a simple voltage regulator that can drop voltage from 24V(from a DC power supply) to 3.7V and supply at least 2A or more(up to 5A if possibile). Can I just use a 2 resistor voltage ...
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2answers
67 views

arduino nano broken or not after reversing l7805 pins?

I tried to breadboard a project using arduino nano and l7805 regulator power by 12v dc from wall. I pluged the regulator backwards, output to 12v and input to 5v arduino pin, by mistake for a couple ...
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1answer
64 views

LM2678 Output Voltage Drop Under Load

I soldered up a LM2678 for a 5V 1A output with a 12 volt input (Input voltage and current from (12v supply @2A) like shown here. http://www.ti.com/lit/ds/symlink/lm2678.pdf It outputs a solid 5 volts ...
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1answer
63 views

Power adapter versus Power supply

I have a mini water-pump/motor hooked up to an LM338 (similar to LM317, but capable of higher current output). I set up the LM338 to create a 6.1-V output, from an 18-V input; this was done by ...
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31 views

1.25V shunt regulator help! [duplicate]

I have used TLV431 precision voltage-adjustable shunt regulator as a source of 2.48V to be used as a reference. The output of the circuit will be fed into an op-amp voltage follower. My problem is it ...
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2answers
72 views

What can cause the output voltage of a buck converter to drop (apart from high current)?

I am using the LTC3388-1 buck converter to provide a microcontroller with a regulated 1.8V voltage. I use pretty much the reference circuit as seen in the image. When I disconnect the ...
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1answer
70 views

Running a Microcontroller with Selectable Voltage (3.3V/5V)

I'm working on a non-volatile SPI memory chip programmer. My design sends individual data bytes over USB to an MCP2200 (USB to serial converter chip), then the serial data is sent to an ATMega48, ...
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5answers
303 views

voltage regulator design flaw in application?

I am a veterinarian and I need some help. I purchased two very expensive lift/weigh table/scales. After about 5 years of service one of them failed. I determined that the main PC board had failed. ...