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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HOW TO CONNECT 100w LED IN TO MAINS 220V [on hold]

I wish to operate five of the LEDs shown below from 220 VAC mains. please can i have some help ?? coz buy Transformer's is a fortune and space not that much. Specifications: LED module ...
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2answers
73 views

Question about LDOs and the practicality of this application

I'll try and keep this as organized as possible so everyone can understand my thought process as easy as possible. I will be using a 12V 5A switching power supply (available on eBay) to convert my ...
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56 views

Old power supply regulation board will not trim to spec

I have an old voltage controlled synthesizer that relies on accurate power supply voltages (+/-) for everything to run in tune and so it can interface to other similar instruments. Yesterday I opened ...
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1answer
53 views

Voltage step up for bidirectional current source

I will be using a circuit similar to the following to create a bidirectional current source driving a max load resistance of 10k at a max of 2.5 mA. (based on this article ...
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13 views

Voltage regulator for MCP3202 [on hold]

I am using MCP3202 for 12 bit ADC conversion and the circuit is working fine(from SPI perspective). The MCP3202 uses VDD and Vref as a common pin (which is a bad thing for 12 bit ADC) and I am looking ...
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96 views

Output of voltage supply drops to about 1V from 5V

I have fabricated a PCB board. It consists of the following circuitry: 9V - 78L05C - (a circuit consisting of resistors, opamps, comparators, analog multiplexers). I have attached the pictures of ...
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125 views

Selecting a transistor for high-side switching at 5V with a 2A load current

I'm doing a high side switching of 5V 2A load and will be ON or OFF for long time(1-10 hours). Now I'm confused about which transistors should I use ? or MOSFETs ? Do I need heatsink ? I really ...
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2answers
82 views

Are there any high voltage (14V) MCUs? [closed]

Switching regulators and LDOs are not an option, for complex reasons. Are there any MCUs which can tolerate a 14V supply voltage? I'm currently looking at 4000 series logic to do what I need, but I ...
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1answer
27 views

Selection of charge controller to charge Lithium Ion battery

I have a DC generator with an output voltage of 27.5 Volts and current of 102 Amps. I need to use this charge my 24V 100Ah Lithium ion battery. So, I need to put a charge controller in between to ...
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1answer
43 views

Can you use a the vout of a regulator as the cathode and your full voltage as anode?

I have a servo from an rc car with 6 wires, it turns out the servo controller is built into the RC Car with a bad board. I have a motor, a gear box and a 10k pot attached to it. I'm trying to build a ...
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24 views

Will my potentiometer provide enough amperage for my h bridge?

I am sending pwm requests to my H-bridge from an arduino. Each pwm signal is a precise so I need to have the h bridge drive it by that specific amount. I want to use 5V for the h bridge supply, so i ...
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3answers
70 views

I want to convert 12v DC into 5v DC

I know there are lot of examples are given on internet. I have searched and I found good one. I am not professional in electronics engineering. I am Software Developer and I am trying to create a ...
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1answer
36 views

Single input terminal for multiple voltage inputs

I am designing a board for which I want to have single input terminal for voltage. Board is microcontroller based(Atmega328) so the voltage coming to uC(Vcc on picture) should not exceed 5V. How I ...
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2answers
83 views

How to keep solar panel voltage at 24V?

I purchased a "24v" solar panel thinking it would output only at 24v, or less if there wasn't enough light. Immediately tested it, in indirect light it's producing 38V. Checked the label on the back ...
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2answers
229 views

Cascading voltage regs not working as expected

I was trying to hack together a power supply circuit with bits I had lying around but I didn't get the voltages I thought I would get, this is what I naively thought would happen: But in reality ...
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3answers
79 views

How to create precision reference 2.5 voltage

Can I create a precision reference voltage of 2.5V using 7805 regulator and ordinary resistors(10% error)/diodes or do I need to rely on specific reference voltage generator?
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4 views

Operate Arduino Nano using variable voltage [migrated]

How safe/dangerous is it to operate an Arduino Nano 5V with a varying voltage source? I have a circuit that provides a duration of power with a starting voltage of 5.3V and an ending voltage of 4.5V. ...
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1answer
58 views

How does dumping excess voltage works?

Sorry for this basic question but I am not finding a simple answer to it Lets say we have a input signal(a node) that we expect to be in the range from 0V to 5.4V. To make sure that it never exceeds ...
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3answers
33 views

NJM78L09UA alternative

I have a circuit specifying a fixed 9V positive regulator; NJM78L09UA (9V 0.1mA) The component seems to be a bit hard to get hold of. Would like to ask advice for more common alternatives. As I'm ...
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2answers
85 views

Best way to regulate 9/12v down to 5v and 3.3v

If my source is 9 or 12v should I first us a linear regulator to step it down to 5v and from the 5v use another linear regulator to step it down to 3.3v? The 3.3v will be going to a micro-controller ...
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1answer
45 views

Why doesn't my TL071CP op amp act as a voltage follower?

I have the TL071CP op-amp, and I am trying to make a simple DC voltage follower, however, I only get a couple hundred milivolts at the output. Usually 200-450mV. Any idea why? simulate this ...
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3answers
59 views

78L05 questions [duplicate]

What are the capacitors on the input and output of a 78L05 for? I saw a lot of different schematics with a lot of different input and output capacitor values. So now I am really confused, and I'm ...
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3answers
106 views

Whats the reason for triangular carrier PWM

I understand that triangular carrier PWM uses a higher frequency triangular carrier wave to compare with the desired output waveform but I would like to know more about the process. I've also learned ...
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1answer
46 views

Rechargeable battery configuration for 5V

I have 6x 18650 (3.7v) cells. I'm trying to build basic power-bank and wondering what battery configuration would be better for minimizing power loss in voltage regulation/conversion process? Edit: ...
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1answer
68 views

LM317, principle of operation

I have found a schematic explaining a LM317, principle of operation. The way I read the diagram, the non- inverting op-amp input (+) is always going to be at the 'INPUT' level, and doesn't matter what ...
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78 views

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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22 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
58 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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1answer
38 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
53 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
71 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
67 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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43 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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80 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
88 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
75 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
76 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
81 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
62 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
140 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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1answer
110 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
109 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
72 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
89 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 ...
2
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1answer
90 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
88 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
66 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
129 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 ...
0
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3answers
88 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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3answers
83 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.