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

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4
votes
1answer
49 views

What is the ideal way to handle data pins D+ and D- on a USB power adapter to be compatible with fast charging on devices?

I have found that many USB wall chargers use a resistive voltage divider to set the D+ and D- pins to a specific voltage, usually between 2 and 3 volts. Other USB wall chargers short the D+ and D- ...
0
votes
0answers
49 views

Wind energy (using 220v ac motor)

I have created a mechanical section of windmill generator but I am stuck in the power section. Knowing that I used ac 220v motor, how can I convert this unknown and variable ac voltage into dc 12v?
0
votes
0answers
38 views

Which type of power supply to equalize SLA battery?

I have some 6V SLA batteries wired in parallel and am wanting to apply a 7.5V (2.5V * 3 cells) equalization charge for a couple of hours. The problem is I'm trying to figure out which type of power ...
1
vote
1answer
43 views

How to choose what a power supply to drive 2 x 10watt RGB LEDS?

I'm trying to figure out how to determine what power supply I should be using for different types of LEDs for this and future projects. I have 2 x RGB LEDS: Forward Current: 350mA Forward Voltage: ...
5
votes
2answers
91 views

Two analog power planes for same voltage

I'm designing a board with LAN8720 and LPC1768. LPC's ADC and LAN's magnetics connections require analog 3.3V power. Should I separate these two analog power planes with a ferrite as I separate it ...
1
vote
2answers
36 views

Amplifier damage caused by failed power supply capacitors [on hold]

MY QUESTION IS THIS: Would failed power supply caps cause peripheral damage to the amp, preamp or control circuits ? Supposedly there is "protection" for "DC offset, over current and over heat" I ...
0
votes
0answers
25 views

2.Can I use power supply with specs 'out: +5V - 2.5A / in: ~50-60Hz 0.5A' work with 'USB 2.0 HD 500GB’ requiring 'out: 5V - 2.5A / in: ~50-60Hz 0.4A'? [duplicate]

Info about external Harddrive (HD): https://www.lacie.com/support/support_manifest.htm?pid=11085 This is a different question than my 1st one. The difference is: - my 2nd Question: 'out: +5V - ...
-1
votes
0answers
20 views
0
votes
0answers
50 views

Troubleshooting a Bipolar Power Supply [on hold]

I am new to electronics and am using a Kepco 50-2M Bipolar Power Supply. Some things are deeply troubling to me. For one, when I measure the potential difference between "common" and "output" ...
3
votes
3answers
108 views

Why would the output voltage of a 5V SMPS (USB charger) increase with load?

I've been using a USB voltage/current measurement device to evaluate power consumption of USB devices and performance of USB chargers and batteries. Most of the USB power supplies I've used are ...
-2
votes
1answer
48 views

where can i find voltage sensors [on hold]

I am shopping for voltage sensors to measure voltage between 0 and 300V and I cannot find a sensor which uses voltage supply of 5V . Any ideas I only have 5v suuply voltage
4
votes
1answer
96 views

How power system is designed for extreme small system, such as google contact lens?

I just read this news and got very curious: http://www.takepart.com/article/2014/07/23/goodbye-finger-pricking-how-googles-smart-contact-lens-really-helps-diabetics Google is designing "Google ...
0
votes
0answers
50 views

Effective power circuit for currents up to 1.5A and with battery charger (PMIC or not to PMIC?)

For my ARM-based (A10) device I need to create power circuit. Input voltages: 5-28V, may be charging from USB. Output voltages: 5V, 3.3V, 1.2V, maximum output current -- up to 1500mA, working current ...
-1
votes
2answers
58 views

Converting a 9v Battery powered Device to a 9v dc power supply [duplicate]

I have an old Vivanco MX300 mixer which runs of a 9v battery. I have it in the same place and it's an inconvenience having it run by batteries. Could I use an old AC/DC adapter that would supply 9v ...
0
votes
3answers
66 views

LPC1768 Power Supply Design (an unknown symbol)

I have a question about power supply design for a board which use an LPC1768. Below image is taken from http://www.nxp.com/documents/other/IAR_LPC1768_Eval_Board_Schematic.pdf document. There is a ...
-1
votes
1answer
36 views

How to monitor active USB hub? [on hold]

I have an actively powered 6-port USB hub (using a wall plug transformer with 1.2mm coax plug into the hub) and want to use it hostless to charge (up to) 6 devices. while it certainly works in a ...
0
votes
0answers
32 views

Cascading LM300 series VRs?

Would it be ok or efficient to reduce a 120 volt to 44 volt transformer first down to 17 volts DC through a LM338T then again through a LM350T to output 9.5 volts DC so I can use an 4700uF 25 volt ...
1
vote
0answers
20 views

Texas Tiva Power On

I am attempting to power on a Texas Tiva TM4C123GH6PM with an external power supplied by the VCC pin from a generic ESC. In the board, there is a non-soldered pin named VBUS which I wonder is ...
0
votes
1answer
68 views

Simpler ways to generate a negative voltage?

I was in need of negative voltage to generate a ramp signal. But I am using the single supply. I tried to generate negative voltage using the DC-DC converter, but I felt it is quite an expensive ...
0
votes
3answers
60 views

Can I power Ardiuno using buck converter IC 3485 or any other buck circuit?

A buck circuit lowers the voltage by generating pulses at a certain duty cycle. Is it okay to give this pulsing voltage to Arduino? Can Arduino work normally with this? I have 12V battery and I want ...
0
votes
1answer
67 views

Why there is 3 phase mains input for this AC/DC power supply?

Here is the specs: http://www.linmot.com/fileadmin/doc/Accessories_Controller/ps_S01-72-1000_e_recent.pdf This power supply outputs adjustable DC. But why it has 3 line inputs and an earth??
2
votes
1answer
116 views

Challenges to design high-density power inverter

Google has announced a contest to design a kW-scale (>2 kVA loads) power inverter with 90% size reduction compared to present designs. The goal is running household appliances from a small inverter, ...
1
vote
3answers
85 views

Paralleling power supplies for higher current

I am looking at using two Cincon (CFM80S240 and CFM60S240) power supplies in parallel to achieve a higher current output. Is this possible? If so, can I just hook them up in parallel, or is there some ...
-1
votes
1answer
53 views

200mA constant current @ 6V from 12V battery [closed]

I have made a digital speedometer with a Hall-effect sensor, but while the battery is discharging, sensor output also changes. I need a circuit that consumes the entire battery capacity, that is, from ...
3
votes
2answers
97 views

External power supply for a DSLR flash

I have an external flash for my DSLR camera (a Canon Speedlite 430 EX II) that runs on 4 AA batteries. I plan on using this flash in a photo booth at a wedding, so it would be great if I could hack ...
0
votes
1answer
31 views

Mini-DIN to USB-Power [closed]

I have an old laser printer, HP LaserJet 2100, with 2 ports: a parallel port; an 8-pin mini-DIN female "LocalTalk port" connector: I am using a Raspberry Pi as a network print server. The Pi ...
0
votes
0answers
6 views

Is it safe to power access point from cigarette lighter? [migrated]

Access Point requires AC power adapter with 12V and 1A output. Can I use cigarette lighter adapter (usually intended to be used to charge laptops in a car) for this device? Cigarette lighter adapter ...
1
vote
1answer
90 views

How do I reduce the DC output voltage of a power supply?

I have a DC power supply which takes 240V AC as an input, and steps down to 30V AC with a 200VA step down transformer c/w rectifiers, but the output voltage which I get is about 43-44V DC. The voltage ...
0
votes
1answer
31 views

Can the volts and\or amps in a repalcement DC power cord vary without problems? [duplicate]

In general I've always wondered about this but now I have lost the DC power cord to my portable speakers. The manufacture does not have a replacement or at least one I can find. The specs are 12.5 V ...
0
votes
3answers
75 views

Will a dual car charger that shows a maximum output of 2000mA produce a 2.1A current?

I have a dual car charger that states input is 12-24VDC and Output is maximum of 2000mA, but it is supposed to have one port charge at 1A and other port charge at 2.1A. Is the 2.1A output possible ...
1
vote
2answers
94 views

Are all USB “audio adapters” DAC's? Can USB ports be used for analog output?

Kind of a weird question.. Background: My motherboard has started producing weird static(buzzing) noises on the audio output(3.5mm jack), it's not noticeable when using headphones, but on speakers it ...
0
votes
0answers
32 views

Disconnect PV string from inverter and connect to charge controller on grid failure

I'm designing a PV system where a string of panels is connected to a normal grid tied inverter, but when the grid fails, I want to switch the string to feed a charge controller that will top off a ...
1
vote
2answers
74 views

How to power my datalogger?

I am building GPS datalogger. It will consist of Arduino Pro Mini 3.3V, GPS module - GY-GPS6MV2 (GPS Ublox NEO-6M) (bypassing 3.3V regulator) or Skylab SKM53 (MT3329). Data will be written to SPI ...
2
votes
1answer
71 views

Tell me about inrush current limiters

I'm not all that knowledgeable when it comes to advanced electrical engineering, so I'm asking for some advice here. Here's my problem: We have several mobile refrigeration units that are powered by ...
0
votes
1answer
59 views

Need difference between power rails,voltage rail and current rail

Can anyone please explain the difference between power rails , voltage rails and current rails?.How do we choose between these rails?
0
votes
2answers
95 views

Power Supply Current is very low

I made a power supply from a diy site, the schematics are above. The site showed the project as 2amps output but I'm not getting even close to that. I'm getting around .14A or less. Does anyone know ...
1
vote
2answers
98 views

How can I seamlessly switch power supplies?

Quick question, I am not very good with my electrical circuit terminology so I'm not sure what to call what I'm trying to do. When I try to Google "How to switch power supplies" I got inundated with ...
0
votes
3answers
148 views

Grounding a capacitor?

Noobish question. I'm trying to make a dc variable voltage power supply. I will include the schematic which I am trying to build. In the schematic there are two 1000 uf capacitors which I believe are ...
0
votes
0answers
27 views

Transformers in series for Variable voltage DC power supply

I Would like to build a 15 amp Variable voltage DC power supply using a bridge rectifier, LM723 IC, transistors and transformers (i found a circuit on youtube i would like to try) I have 2 old Cable ...
4
votes
6answers
181 views

Given a known power supply, what are safe ranges for the volts/amps/ohms of connected components? [duplicate]

I'm new to hardware and am coming from a software background. I have an SoC that will be powered by a supply generating 5V and 1A. I'm trying to figure out what are the safe ranges of volts/amps/ohms ...
-1
votes
4answers
75 views

30A power connector

I've never really used power connectors before. I am working on a project and saw there are power connectors in it. We had some issues and changed the manufactured power connector to a 30A power ...
0
votes
2answers
67 views

How are these RC values calculated in this buck converter?

Buck converter: LTC3824 The datasheet says: VC (Pin 4): The Output of the voltage error amplifier gm and the control signal of the current mode PWM control loop. Switching starts at 0.7V, and ...
0
votes
1answer
44 views

configuring a dc:dc regulator

I'm trying to set up an lm2734 to regulate a VIN of 9V - 12.6V down to 5.0V. I'm a bit of a noob, and the sample configurations they provide don't have the 5.0V output scenario. My specific question ...
6
votes
5answers
2k views

What happens if a 240V appliance is connected in a 120V AC power supply?

I know that putting 240V through an appliance rated at only 120V would almost certainly damage it. But what if I connect an appliance rated for 240V into a 120V AC socket? Apart from degradation in ...
0
votes
1answer
55 views

Power Supply Design: Am I after DC-DC Controllers or DC-DC Converters?

I'm trying to design a variable dual rail power supply, which has an unregulated input voltage of ~11V and a maximum output current of 1A. I want to have a 5V/12V/20V positive and negative output. ...
-1
votes
2answers
69 views

Why does my laptop adapter output nominal voltage with a broken capacitor?

My adapter broke, so I started my repairs by measuring the output voltage; it was 18V as it's supposed to! So, I figured my laptop charging cicruit was broken, but when I opened the adapter I saw the ...
0
votes
1answer
42 views

Drive power supply straight to Peltier (TEC)

Can I clip the output wires of a 12V power supply to the wires on a Peltier (TEC) module? http://www.customthermoelectric.com/tecs/pdf/00711-5L31-03CA_spec_sht.pdf
0
votes
1answer
77 views

3V and 5V supply Topology (Embedded Design, Mixed Signal)

I am developing a mixed-signal embedded system that requires both 5V and 3V rails. The 5V rail powers an analogue sensor and a precision ADC. The nature of the sensor is such that its output will be ...
2
votes
4answers
550 views

User safety for battery powerd device against misuse of power supply

I want to design a safety circuit for a battery powered device which measures human body impedance. It is intended to be powered only by an external battery pack (5V) via a USB cable. But I want to ...
0
votes
2answers
29 views

linear actuator power supply and remote or switch

this will be my first DIY project involving electricity so i want to make sure i buy the correct components. i'm purchasing a used telescoping column (aluminum and steel, 4000n) that has two actuators ...