An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

learn more… | top users | synonyms (2)

0
votes
2answers
43 views

Will the power supply change the output in a Amplifier circuit?

Problem: I designed this circuit for a project, but we have to use a biased power supply of +15v and -15v for the amplifiers. I'm a bit confused about how this linear equation (V2 = 20(V1) + 5) ...
0
votes
1answer
52 views

How to make bipolar supply -2.5v to +2.5v from unipolar supply?

I need a regulated bipolar supply for precision adc. It should have two fixed outputs: +2.5v and -2.5v. How to build such supply using unipolar supply with voltage 5v or higher?
1
vote
1answer
31 views

AC adapter splitter

I'd like to power 2 or more devices (all requiring the same voltage) with a single AC adapter, instead of using multiple adapters. Is it safe to use one of these splitter cables? In my case, i have: ...
-1
votes
1answer
40 views

switch mode power supply

I want make a switch mode power supply but I don't know how to design its circuit diagram. I know the general theory behind an SMPS system and its components but I don't have enough knowledge about ...
0
votes
1answer
27 views

Inductors for local power supply filtering

Lets say I have a circuit which involves an OpAmp and a comparator. They're both single supply running from a noisy USB power supply. Each component has local bypass capacitors, a big and a small one ...
0
votes
0answers
54 views

24v power supply doesn't work properly

I recently purchase a cheap 24V power supply on ebay and I just received it. I know, I already hear you say that the cheap part is the source of my problem but what's done is done and I have to work ...
1
vote
2answers
32 views

Transformer half power options

I have a power transformer with 120 and 220 volt primaries for ~650 volt from the secondary. If I wanted lower voltage from the secondary, is there any reason I couldn't run my 120 volt line voltage ...
-2
votes
0answers
31 views

Is a 32 volt power supply (650ma) too much for 24 volt control devices [duplicate]

I have a power supply that is 32volt DC. (650ma).( it is from my old printer/copy/scanner) I want to build various control circuits. Is 32 volts too much for 24 volt devices to handle? I know + or - ...
-2
votes
0answers
22 views

Shaft alternator [on hold]

What would a typical power output be for a shaft alternator on a large 2 stroke slow speed marine diesel engine. MAN B&W or similar. Also the potential for storing such power generated into ...
0
votes
0answers
37 views

Is there a cheap copy of Adafruit's PowerBoost 1000 charger? [closed]

There's an intersting charger that comes from AF. The main thing is that it works the way UPS does. A must have for small robots etc. But a lot of citizens of the third world like me are perverted ...
-1
votes
0answers
18 views

Power Source over Coax Debugging

Currently, I'm trying to build and get the power box as described at http://www.stargazing.net/david/radio/itty_bitty_radio_telescope.html that I'm copying to work. Currently, mine does not work. I'm ...
0
votes
1answer
43 views

600 watts regulated DC for 3 seconds [on hold]

In my area, due to frequent storms, there are frequently short mains power cuts lasting a second or two at most. While the shorter several-millisecond outages don't usually cause issues, the longer ...
1
vote
3answers
98 views

Buck converter based switching power supply?

simulate this circuit – Schematic created using CircuitLab I have designed this circuit based on a buck converter. I'm just having trouble finding out which values to plug in. I.E. C1, ...
0
votes
2answers
45 views

Calculating peak current of solenoids

I'm a electronics newbie, and I'm making a project with 8 24v solenoids playing percussion quickly. I want to power these all with the same power source, so I'm being careful. This is similar to ...
0
votes
0answers
25 views

Using ~24V SMPS or 12V SMPS in series vs. two 12v lead acid battery to power sine wave APC UPS for custom audio rack 230v/120v clean power supply [closed]

---The context--- I live in India (230V/50Hz), i need to build a road case rack with a power supply that will be placed in the rack and can provide clean power to various audio/recording equipment ...
0
votes
0answers
28 views

Portable Power Unit for 18V Power Input Device

Background I am experimenting with music mixing. I want to be able to record my music while "on the move", that is, not in the house, but in my car, so I can drive somewhere quiet and enjoy my ...
0
votes
2answers
56 views

What is the best way to serve AC power to a 12v - 5v DC regulator with 1Amp current?

What transformer should I use to supply AC voltage in a circuit which is using 7812 and 7805 - Positive Voltage Regulators. I need approximately 1Amp current. What is the best way to minimize the ...
0
votes
1answer
41 views

light bulb socket which connection to use? [closed]

I am trying to install a light bulb in a socket with 4 connections: P N M1 GND I am wondering which ones to use for connecting a simple 220v light bulb? thanks.
-2
votes
1answer
34 views

controllable and accurate static charge generator

ive been doing some research on methods to generated static charge. ive come across 3 main methods: wimshurst generator, van der graaf (and Negative Ion Generator). wimshurst and van der graf seem ...
0
votes
2answers
43 views

Using 1000x WS2811 leds and 5v 60amp Power supply. When do I need to re-inject power?

I've been reading a lot about the WS2811 LEDs and how to properly set them up. I've purchased a few thousand of them off of Ebay for various projects because they're so easy to use. So far I've only ...
0
votes
1answer
43 views

How to connect 3x200AH Batteries in my 24V System

I have the following components in my system: 1- a 24V inventer 2- 2x130w 12V PV connected in Series 3- 1x310w 24V PV Connected in parallel to make a 24V system 4- a 30A PWM Charge controller. ...
1
vote
0answers
104 views

Need help to identify a PCB connector

I'm refurbishing an old Apple II Power Supply made by Astec. It's working now, but I damaged the connectors which connect the Live and Neutral wires to the Power Supply PCB. On the PCB are two posts, ...
1
vote
1answer
39 views

AD8222 single supply EMG

I am working with the AD8222 dual package instrumentation amplifier from Analog Devices. I want to build a compact EMG system so I am trying to use this chip since there are not a lot of dual IAs on ...
-10
votes
0answers
47 views

How to design mini UPS [closed]

How to design a ups to operate 12V DC-powered instrument at up to 3A current?
1
vote
1answer
43 views

Transformerless stabilized power supply for isolation amp

I'm building a circuit similar to this: https://courses.cit.cornell.edu/ee476/FinalProjects/s2008/cj72_xg37/cj72_xg37/ (voltage and current sensing of a 230V line) I'm using two HCPL-7520 isolation ...
1
vote
1answer
71 views

Capacitor in parallel with battery for high current output

I have a long-term application with very low quiescent current and infrequent pulses. I've spec'ed high capacity, low pulse current batteries that will give me the lifetime I need, and I want to ...
-1
votes
3answers
74 views

Want to run a Speaker/Amplifier combo from a rechargeable battery [closed]

I want to run KRK RP5 G2 Studio Monitors off battery for at least 1 hour. These are a combination of speakers plus amplifier in the one unit with AC power input. I do not want to use car battery ...
0
votes
1answer
61 views

Possible to run nichrome at very low voltage?

I want to operate a 1-inch length of nichrome 80 wire, 26 gauge, at 200-600 degrees Farenheit. This type of wire has 2.657 Ohms of resistance per foot. So, for 1", there would be 0.22 Ohms of ...
0
votes
0answers
36 views

Problem with integrating Intel Edison

I have been working on developing a device that combines a cellular modem and the Intel Edison. The modem sends and receives data over the network while the Edison takes that data and interprets said ...
-1
votes
0answers
32 views

3.7 V battery in arduino micro

How do I connect a 3.7V battery into the arduino micro? I want to make a power supply for a circuit that is using a arduino micro. I have: a sensor neopixel arduino micro battery 3.7V And my ...
0
votes
0answers
27 views

Is slowly charging a battery extending the lifetime? -why

Is slowly charging (like usb: 500mA) a battery of a cellphone/ tablet/ notebook increasing the overall lifetime of the battery itself? If yes: why is it ? Why do LiIon batteries lose capacity over ...
0
votes
1answer
67 views

How to select power (between USB and battery)?

I'm hoping to power my device with a 3.7V (2x 18650) rechargeable battery which can be recharged within the device using USB (like in a phone, laptop, etc.). I believe some kind of power selector is ...
0
votes
0answers
63 views

TS317 voltage regulator 12v to 3v

I'm building a Star Wars Millennium Falcon and happened that I need 12V to my LED strips and I need 3V to each of my single LEDs; And also to my smoke machine that runs at 3V. I went to the Maplin ...
0
votes
0answers
25 views

36V Backup battery switching

First let me say thanks, and reading through history,there are a lot of smart people on here and hope answer does not go over my head. I have family member that has started a Wireless Internet ...
0
votes
0answers
38 views

Industry standard for remote monitoring of solar power generation

I'm a software engineer and I'm working on the code for a small device that will monitor the electrical production of an array of power conditioners (grid-interactive inverters) for a set of solar ...
0
votes
1answer
55 views

Power supply for an irrigation system

My irrigation system control box just died and I'd like to replace it with a smart controller based on a Spark Core programmable board, so I can monitor temperature, soil moisture, humidity, and other ...
0
votes
0answers
76 views

Transformerless Power Supply High Current

Is there any way for Transformerless Power Supply to output a High Current like 10A to 15A at 12V to 24V. I found highest of 500mA current output for Transformerless Capacitor Power Supply. I wanna ...
-1
votes
1answer
39 views

Where i can select and buy ferrite toroid core for SMPS? [closed]

I made push-pull smps working on 50 khz. It has up to 90-120w power (input voltage 12v and output 24v). For transformer i am using two ferrite toroids on top of each other, it's a old USSR toroids ...
1
vote
1answer
64 views

How a usb device identify a purpose made powerful USB charger?

I know that by standard no device should ever try to draw more than 500mA from USB. But a lot of phones and tablets can somehow identify their purpose made chargers and draw far more than 500mA from ...
0
votes
0answers
78 views

How can I split the power from a single PSU between multiple motherboards (with a twist)? [migrated]

I am looking to build a home blade unit to save on space (need them locally) and cost, as I need 20 - 40 servers. I've done the basic work on design, but here lies my biggest problem(s). I have no ...
-1
votes
2answers
61 views

How many items can be connected to a single power supply? [duplicate]

I have a single 12V 2A power supply which is powering 4 CCTV cameras which require a 12V 1A power supply each in addition to an illuminator lamp which requires 12V 2A supply. At the moment everything ...
-4
votes
1answer
65 views

How many AA batteries for 10 servos and how long will they last? [closed]

I'm using 10 servos. I know I can't power them with my arduino, so I want to use AA batteries to power them. How many AA batteries do I need then and how long will they last?
0
votes
1answer
38 views

Measure the maximum value of an exponential analog signal and provide a constant supply having that same value

I need to detect the exact time for which an exponentially decreasing analog signal is equal to the half of its maximum value. I'm using for that a digital-output comparator but I have a big problem ...
0
votes
2answers
88 views

Dual rail switching PSU critique

I am looking for feed back on the following power supply design. This power supply is intended to have 2 outputs: 24V @ 500mA and 32V @ 850mA. When the power supply is in standby, J1 pin 1 is @ 0V, ...
0
votes
1answer
47 views

Power Supply Router implementation

I am looking for the general approach (technique/strategy, componentry used, etc.) to implement what I am calling a power supply router, although perhaps there is a more precise/accurate term for it. ...
0
votes
3answers
85 views

Function generator as a DC power supply

I'm wanting to start my own lab at home so that I can learn things faster than uni teaches (we're not allowed into labs unless we're in our own lab). A friend said that I'd be better off getting a ...
0
votes
0answers
38 views

DDR2 memory interface and requirement of termination voltage VTT

I am currently designing a board with Freescale's K series microcontroller and a DDR2 SDRAM memory chip. The interface is point-to-point with only one DDR2 memory interfacing to the microcontroller. ...
0
votes
1answer
48 views

Name of the HP Female Adapter Socket In My Laptop

I have this HP powerbrick with a 90W capacity (19v 4.7A) that I want to use in my project. I am planning to use it as a power source for my 50W LED. But I want to keep the male socket it has rather ...
0
votes
0answers
21 views

Power supply for 2.5'' HDD [migrated]

I have 2.5'' Toshiba HDD which requires DC +5V/1.1A. I also have power supply with DC 12V/2A and 5V/2A output. It uses MOLEX connector (12V on pin1, 5V on pin4) with reduction to SATA connector. Can I ...
0
votes
1answer
27 views

Power Supply for L293D

Why a separate power supply is needed for L293D while interfacing with microcontroller. I have searched it but didn't got any proper/relevant answer.