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

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2answers
29 views

Why we don't see adjustable “High” and “Low” Voltages for discrete logic gates

For single, discrete logic gate chips, why is it that we don't have adjustable types? The closest we have are those that vary along with voltage supply. I suppose it uses a voltage reference in the ...
1
vote
1answer
50 views

How to get my internal Harddrive to spin externally?

I have a Seagate ST3500620AS Harddrive that's just laying around and not being used. I want to power the motor at full speed (rated to run at 7200rpm) and do some hobby projects with it. Problem is, ...
0
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0answers
19 views

Turning on a LP360 power supply

I got my hands on a LP360A power source, it was inside a Sun Microsystems server my company removed from service and got to scrap it. I haven't been able to turn it on. I know I'm supposed to short a ...
0
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1answer
63 views

variable power supply (0V/5V/7V/10V/17V) without using potentiometer

How can I design a variable power supply that will give an output of 0V/5V/7V/10V/17V without using a potentiometer? I don't know much to do because my professor didn't taught us about this. If you ...
-1
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0answers
29 views

Is my UPS responsible for all this damage? [migrated]

I have an APC Back-UPS RS 550G which I've been using in my home office for about a year. It saw me through a few power outages for which I was quite glad. However, I've lost quite a bit of time to ...
2
votes
1answer
38 views

Buck regulator to match an analog voltage

In desktop computers, it's common to have headers that control fans with a 0-12V analog output, capable of up to 1A. This works fine for one or two fans, but with more than three fans, you can exceed ...
1
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1answer
30 views

How do I model an over voltage spike on LTSpice? Any circuit example

I am doing project, I am trying to simulate an overvoltage/under voltage protection controller on LTSpice. How do I create overvoltage/unudervoltage on a source? For example a transient voltage spike? ...
6
votes
2answers
805 views

Is it better to boost or buck?

I'm making a solder fume extractor from an old PC fan (4-pin PWM), driven by a mid-range PIC. The fan needs 12V @ max 0.28A for power and a 5V PWM @ max 5mA to control the RPM. So I'll be running the ...
0
votes
1answer
19 views

High power led driver for COB leds

I bought some chinese COB 100W Led lamps from Ebay and I was wondering what would be the most efficient way to power them. Led specifications: 24vDC 4.2A I want to use 4 leds in total, so that makes ...
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2answers
22 views

0-5V supply to control brightness of BWTek spectroscopy light source

I recently installed a BWTek BPS101 tungsten halogen light source and would like to take advantage of the builtin support for manipulating the operating current (changing the brightness) via an ...
3
votes
2answers
330 views

Will 0.16 amp rated fan replace a 0.3 amp fan?

I have a noisy PSU fan (400 watt Coolermaster PSU), It's 120mm and 12 volts. I have found an identical fan which is also 12v, but rated 0.16A, as opposed to the original 0.30A fan. I'm aware PSU ...
0
votes
1answer
41 views

What is this M01PTH I see referenced on schematics?

What is this part "M01PTH"? I'm interested in building this "BBQ Temp Controller" Arduino-based project here: http://hruska.us/tempmon/ One component involved is a 12v blower. In looking at the ...
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2answers
79 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
74 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
38 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
41 views

switch mode power supply [on hold]

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
29 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
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0answers
56 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 [closed]

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 ...
-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 [closed]

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
103 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
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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 ...
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votes
2answers
58 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.
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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
45 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
45 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
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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
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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 ...
1
vote
1answer
44 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
73 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
78 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
37 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
33 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
70 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
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0answers
64 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
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0answers
27 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
58 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
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0answers
79 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
40 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
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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 ...