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

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24 views

Cascading LM300 series VRs?

Would it be ok or efficient to reduce a 44 volt-out transformer to 17 volts DC through an LM338T then again through an LM350T to output 9.5 volts DC so I can use an 4700uF 25 volt electrolytic ...
1
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0answers
19 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 ...
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1answer
57 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 ...
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3answers
50 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 ...
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1answer
65 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
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0answers
70 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, ...
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3answers
77 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 ...
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1answer
50 views

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

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
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2answers
94 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 ...
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1answer
30 views

Mini-DIN to USB-Power [on hold]

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 ...
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0answers
5 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
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1answer
84 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 ...
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1answer
30 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 ...
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3answers
72 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 ...
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2answers
92 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 ...
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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
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2answers
68 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
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1answer
70 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 ...
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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?
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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 ...
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2answers
97 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
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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 ...
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0answers
23 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
175 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 ...
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4answers
74 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 ...
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2answers
65 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 ...
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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
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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
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1answer
53 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. ...
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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
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1answer
38 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
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1answer
73 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
548 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
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2answers
28 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 ...
1
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4answers
104 views

Is it possible to run PIC16F88 at 3V?

I have notice that PICs have the 16F88 and 16LF88 version, after some researching i tought the LF is for chips that work at 3.3V, in other places it says i can still use the 16F88 at 3.3V, the ...
1
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1answer
46 views

Looking for symmetric power supply solution

I am looking for a power supply circuit that fulfills the following specifications: 12VAC or 15VAC wall wart input Symmetric +/-12V output (7812/7912 combo) Should easily be able to provide 500mA on ...
-1
votes
1answer
56 views

Which short-circuit-current can be expected from a power supply that produces Uout=5V and Uout=4.5V?

A power supply produces these voltages: Measurement 1: Uout=5V and Rload=infinity Measurement 2: Uout=4.5V and Rload= 1kohm Which short-circuit-current can be ...
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1answer
84 views

Understanding a power source's internal resistance?

I have a mechanical system that requires a certain amount of electrical power. Now, when I calculated everything I did not include the internal resistance. For example: I calculated that the ...
2
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2answers
198 views

What is a good power electronics textbook?

I really want to learn as much as I can about power electronics, switching mode power supplies, and overall analog design. Unfortunately my universities computer engineering program is still ...
-1
votes
1answer
43 views

Can a 2W supply power the Relays

I'm designing my first circuit with 2 relays JQX-15F / 005-1Z1 NO20A/NC10A 240VAC(datasheet, probably the SPDT variant) and a 2W ...
0
votes
2answers
97 views

What is this little board I've found in an ATX PSU?

I have dissassembled and old ATX power supply, and I've found this small board between the male AC input socket and the main board. What is it?
2
votes
1answer
56 views

Catch diodes in switch mode power

I am wondering about catch diodes in the context of switching power supplies. I have read all the books that are the norm in designing a SMPS, but all of them don't or barely touch the subject. My ...
1
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1answer
121 views

Where does 264Vac come from?

Power supplies often accept an input range of 90-264Vac. I am wondering where the 264 comes from. A couple of random examples from power supplies available: 85 - 264 Vac input range (100 - 240 Vac ...
0
votes
6answers
76 views

How do I figure out the exact voltage and current needed for a part?

Whenever I look for parts in my local electronics store, I come across parts(e.g a speaker), that have just a power rating stated(e.g 2W). While I know how to calculate power,voltage, resistance etc, ...
0
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1answer
56 views

Power Supply with Short Circuit Protection

a Power Supply with Short Circuit Protection that Automatically turn Off when Shorted and automatic resumes its function if not shorted without using any switches. thus anyone know how to build this? ...
0
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1answer
51 views

Small size transformer - Design or Pre-made

I am wondering how to acquire or design a small transformer. In my circuit, I need to add a transformer mainly to power my AVR and a bluetooth module. I would like it to be as small as possible as I ...
6
votes
3answers
272 views

Can I obtain a new voltage source from outputs of two cascaded linear voltage regulators in practice?

I have a device which works with 7V. I have a 7812 and 7805 already running in the circuit. Can I use the outputs of this voltage regulators to feed the 7V device? I know this is possible in theory. ...
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votes
1answer
54 views

Charging battery using computer power supply?

I have new 600W ATX computer power supply unit. I have wired green and black together to make power supply turn on when plugged in. I wanted to charge my 12VDC empty battery, without dealing damage to ...
6
votes
3answers
379 views

Deciding capacitor value to use in my circuit

I have a power source which supplies 1A at 5V. I am using a switching regulator which supplies 1.3A at 3.3V. The load requires a burst of 2A without reducing the voltage across it than 3.2 V for 477 ...
2
votes
3answers
125 views

What happens when current sourced from a switching regulator goes too low

On the recommendation of an SO-er, I'm looking at using a TPS54295 to power a controller that uses an ATMega 2560. The regulator will be powered by a 3-cell LiPo battery, implying input voltages ...