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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21 views

Do I need a heat sink for small voltage regulator?

I'm using a 7808 voltage regulator in to-220 package. Vin is 12V, Vout is 8V. Expected max current should be in the range of 10mA, let's say 50mA at most. Circuit is to be encased. Do I need to add a ...
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3answers
24 views

Two LM317 Based Voltage and Constant Current Regulator Circuit

I have read some articles on on the following circuit. I was wondering if I can create such a Voltage and Constant Current Regulator for my Power Supply or not. My Question is - is this circuit ...
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1answer
23 views

Voltage regulator drop

First off I'm a beginner at electronics I don't understand much so bear with me. I've just constructed my first bipolar stepper motor circuit today on a breadboard. I've actually extracted the ...
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0answers
32 views

Looking for “Model” of the L200, ideas? [on hold]

Since i want to build a power supply based of the L200 i want to simulate it first using multisim. The problem is that multisim doesn't have the L200 in their database. So I'll have to make one ...
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3answers
207 views

Should a regulator be added to a circuit where the power source voltage matches the ICs?

I am trying to design a very simple circuit consisting of an accelerometer IC and a Bluetooth IC, all rated at 1.8 up to 4.something volts and thinking to use a single CR2032 cell. Seems like these ...
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1answer
32 views

Equivalent of LTC3780 in Texas Instrument [on hold]

Does anyone know of an equivalent for LTC3780? I have a design for LTC3780 that takes 9-20V input and gives an output of 12V/10A. It seems expensive so i'm looking for an exact pin to pin equivalent ...
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1answer
26 views

How to prevent output voltage spikes

My vaping device operates in two modes, variable temperature control (VT) and variable wattage (WT). The unit first sends out a ~1 second 30 watt/7.74 volt surge to the coil to see which mode it ...
0
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1answer
38 views

the proper way to wire up multiple supply rails

I am making a hexcopter for a shool project that is going to be powered and controlled via an arduino project. my current setup is as follows: Where the linear regulators are the 6 speed controllers' ...
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0answers
52 views

LTSpice output looks very odd when I use LM7805

LM7805 output is supposed to be 5V but it's very irregular and it's close to zero. I also tried adding a series resistor to the power supply but it was no use. Also, it takes forever to complete the ...
0
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4answers
68 views

Difference between a 'DC DC Switching Regulator' and a 'Linear Regulator'?

What's the difference between a DC DC Switching Regulator, and a Linear Regulator. I'm buying one to make a variable power supply (is this the best way to do it?) and I need to just output an ...
0
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4answers
67 views

Implement ac-dc converter for low frequency and very low voltage without external powering?

Iam using a basic cascade voltage multiplier to boost and rectify the 0.3v ac signal. The circuit rectifies but the boost is very less. So I thought of using LTC3105 after this stage to get a ...
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2answers
74 views

Can a SMPS LED driver glow 6 Watt LED bulb and same Driver is able to glow 0.5 Watt LED?

LED : 150mA * 3.3v =0.5 Watt 6 Watt LED (0.5 Watt* 12) : Which one is best method to arrange LEDs Parallel or Series. At a time only one LED will glow, Either 6 watt LED or 0.5 Watt LED. ...
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1answer
75 views

Convert 24V dc to negative 24V dc [closed]

My circuit is supplied by a 24V DC generator, but I have amplifiers in my circuit that need to be supplied by 24V and -24V, so I need to generate -24V dc from the 24V that I have from the ...
0
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2answers
62 views

How to control output voltage on a Buck Converter

I'm fairly new to electronics and I have copied the Buck Converter (LM2678) in the picture attached to convert 24V to 5V. After trying it I have actually converted 24V to 9V and my question is if I ...
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0answers
53 views

Simple 1.2->12V, 5A current limiter circuit with limit indicator

I have a voltage source which varies between 1.2 and 12V, and I would like to limit the current between 1mA and 5A. The voltage source is a switch mode power supply, and the current limiter has to be ...
0
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2answers
50 views

TI TPS57160-Q1 step-down converter outputs sawtooth-like voltage at high input voltages

Disclaimer: I have posted this question on Texas Instruments' E2E Community before (Here), but haven't found a solution to my problem yet. In the meantime, I haven't found any way to progress on this ...
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1answer
44 views

Measuring quiescent current of a voltage regulator

I purchased 10PCS Socket Adapter plate Board For NRF24L01+ Wireless Transceive​ module and would like to know how much current/power it will draw as I want to run a project on batteries. A close-up ...
0
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1answer
50 views

Regulator to feed Arduino VIN with 12V?

I am quite new to electronic and I'd like to build a setup plugged with a 12V PS (because there is a water pump in my setup). But at the same time, I'd like to feed the Arduino VIN with the same ...
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1answer
51 views

Regulating voltage so USB works with module

I recently purchased this GSM/GPS module. I would like to power this module via a USB cable but can see that it has varying input voltages. So bearing in mind that USB is 5V and that I'm an ...
0
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1answer
22 views

TPS61196 LED Driver chip for high Voltage Backlight applications: What to do for proper backlight driving?

I need to design a Backlight Driver which has to have high brightness. These are the equipments I have in the design: My Backlight String combined of 2 parallel of 28 serial LEDs(2 * 28 = 56 LEDs) ...
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0answers
34 views

TP4056 - Increasing charging current

I am designing a Lithium Ion charging circuit that will be using the TP4056. Currently, the peak current is 1A, and I would like to increase the charge current in order to complete the charge faster. ...
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1answer
43 views

Non-led simple bicycle dynamo light system

There have already been questions about how to build a bike power supply based on the bikes dynamo. Most of the answers contained lots of basic components. Some answers here are making a full wave ...
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2answers
62 views

Need help with inverter

I am wondering if it is possible too hook up an oxygen concentrator in my car for longer than normal trips. My gf needs 10 to 15 liters but can maybe get away with 10 (1 machine) for a drive. The ...
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0answers
65 views

Adjustable, Current Limit Regulated PSU (LM317)

I'm trying to build an adjustable, current limited PSU. The PSU will only need to source small currents (<150mA) at 12V. However, the current limit should be adjustable between 20-150mA. I ...
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1answer
62 views

High Voltage Linear Regulator Output Not Staying Constant

I'm trying to use a 3-terminal linear regulator LR8 (Also tried TL783 and saw the same problem...) to regulate 180V from a fixed PSU down to 116V, to power some very light loads < 1mA. But when I ...
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2answers
49 views

Voltage regulator UA78S09 (9V/2A) supplying only 0,4A of current

I power voltage regulator by 12V / 8A power supply. UA78S09 is responsible to convert voltage to 9V for DC motor, which is able to swallow 1,5A at start and under heavy load. Motor however does not ...
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1answer
72 views

Can my DIY Arduino be powered with 12V battery via lm2576 switching regulator?

I have lm2576 switching regulator circuit with output constant 5v/3A. Can I use it with a 12V battery and connect it to power my Arduino?
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1answer
38 views

genarating +/- 5V with a common ground [duplicate]

I am working on a digital voltmeter circuit using ICL7107 IC. Having trouble powering it up. There is a -5 V supply to pin 26. I used a 7805 regulator for +5V supply but wondering how to supply the ...
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2answers
50 views

How to calculate voltage and current of a circuit with input / output MCU pins

I would like to know the method to calculate both voltage and current in a circuit that use MCU input / output pins In this example, how can we find the V / A of all resistances and Capacitors.. ...
0
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2answers
63 views

Best way to create a regulated 1.95V?

I need a 1.95v for a VDDCORE of a microprocessor I'm using, what would be the best way to get 1.95V from 3.3v? or is a regulator the best way.
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25 views

More current handling on LM2596 by adding a Transistor

I want to make an adjustable power supply based on a buck regulator. I try to add a power transistor in order to add more current handling on this DC-DC converter. I am using this concept. I remove ...
3
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2answers
86 views

Designing for DC voltage drop in low gauge wire

Are there any types of DC low voltage power supplies on the retail market that can accommodate for long wire runs (18 gauge wire). I am worried about voltage drop and power failure; I'm trying to ...
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1answer
69 views

Is it safe to separate the power supplies for sensor, buffers, and ADC?

In the LT1054 datasheet it talks about needing a bjt to avoid pulling the VOUT positive with respect to GND (datasheet page 5 Vout (Pin5): http://www.linear.com/docs/2309). Now I am powering an ...
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2answers
64 views

Voltage regulator current and heating

Many texts I read take (Vin - Vout)*Iload i.e the current Iload is I3 in the below figure when calculating temperature of a regulator: But I3 is not exactly same with I1 there is something called ...
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2answers
47 views

Voltage regulator and Kirchhoff current law

In a linear voltage regulator like a TO-220: does Kirchhoff current law apply? What is the equation for the three currents flowing? In other words, what is the relation between I1, I2, I3 in the ...
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1answer
71 views

multiple power supplies (5V, -12V, +12V) all on same board [closed]

I'm finishing up a pcb design and my specs just changed and I need to power an external sensor with +/-12V. I previously had only been concerned with the voltages >0 but now I have to supply voltages ...
0
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1answer
50 views

How to keep/save minimum Vds value of a FET in Analog Design?

For a specific application, I need to determine minimum Vds(in other form min Rds) and need to apply it to inverting input of an opamp. I have a source comes with huge ripple like below: Before ...
0
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1answer
56 views

Voltage Regulator that gives an output of 12V and 10A [closed]

I'm looking for a voltage regulator that takes 9V-20V input voltage and gives an output of 12V and 10A. I found a couple of buck-boost regulators that can do that but i just cant seem to simulate it. ...
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0answers
23 views

Maximum Power for LT 1270A?

I am currently trying to build a 0-60V, 0-10A power supply, and I stumbled upon this part from Linear, the LT1270A. http://cds.linear.com/docs/en/datasheet/lt1270afc.pdf My question is this: Can ...
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3answers
82 views

555 high amperage charge pump inductorless voltage doubler

There's a few resources out there for indcutorless boost circuits, or charge-pump voltage doublers and triplers. http://www.electroschematics.com/648/555-voltage-doubler/ But this circuit is only ...
6
votes
2answers
127 views

Why do the inputs of this CC circuit op-amp need clamping?

I'm studying the constant current circuit of the HP E3610A DC Bench Power Supply. I'm building a supply of similar topology using surface mount components and the LF442 isn't available in a SOIC-8 ...
4
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1answer
156 views

SMPS Buck converter with PWM circuit

I am designing a buck converter with PWM circuitry for a school project to drive a MOSFET switch to keep my output voltage constant. The specs are: input voltage of 20v DC +/- 4 output voltage of 5v ...
0
votes
2answers
72 views

What is the max current that this circuit can handle?

I'm making a simple project. For me, it is recommended that the output current is 1.5A. But it's OK if it is 1A or 0.5A. For voltage regulator: Datasheet says that the output current is up to 1.5 A. ...
5
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1answer
127 views

Switching regulator enable pin low, but output isn't fully off. Why?

I'm working on a battery-powered application using two Texas Instruments switching regulators and a Linear Technology pushbutton power controller: I have confirmed that when I push the button and ...
0
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0answers
33 views

Input Capacitance for Linear Regulators

I work in the subsea industry where a lot of the electronics are housed in oil compensated enclosures. This results in devices experiencing pressure of 300bar!, most are fine, but electrolytics do not ...
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7answers
2k views

Is there any downside to using a larger than needed smoothing capacitor?

I work with low-power DC voltage regulators. I am already aware of the formula to calculate the size of smoothing capacitor(s). This can be an iterative process of testing one size with a scope and ...
0
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1answer
103 views

How to store and step 12V to 5V with capacitor and regulator? [closed]

am a hobbyist with little prior electrical engineering knowledge so please bear this in mind! Trying to safely store and step down voltage from 12V to 5V using capacitors and L7805CV regulator. Have ...
0
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1answer
48 views

LM2576 12V to 5V and 3.3V

I want to step down the input voltage from my power supply (12V) to 5V and 3.3V. Please see my schematic. Is it right or wrong? I use LM2576 as switching regulator. Thanks. Sorry for noob question
0
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1answer
27 views

Multiple voltages and currents required in one circuit

I have a circuit with the following components: microcontroller - 7-12V, v.low current 2x Servo - 6V, 250mA Solenoid - 18V, 14 Ohm coil Geared motor - 9V, 6A stall current Power supply - 19V, 3A DC ...
0
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2answers
89 views

Are there any additonal complications or design considerations to be made when placing voltage regulators in parallel?

The LT3080 variable voltage regulator's datasheet shows a circuit design in which two regulators are placed in parallel to share the power load, resulting in double the maximum current capability of a ...