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
3answers
135 views

Why charge pumps are only used for low current applications?

Typically the most expensive (and hard to get) elements in a SMPS are the inductors. Thus, I was wondering if it's possible to use inductor-less switching mode power supplies (i.e. charge pumps) for ...
0
votes
1answer
62 views

240V ~ 50Hz @ 1500W to 110v 60Hz [on hold]

I'm moving from Australia to America and I have a coffee machine suited for the power conditions described above (and shown in the image below) I've been looking for a converter that will enable my ...
-11
votes
0answers
49 views

HVDC HAS MORE ADVANTAGES OVER AC,SO WHY WE CAN'T USE FOR HIGH POWER TRANSMISSION LINE? [on hold]

friend, i read dc power supply is good and have over advantages on ac supply. but ,in now day we can't use high dc supply, i read we can't generate high dc power. but,we can convert high ac power ...
2
votes
1answer
34 views

12V power supply from PC PSU Coil whine

I am trying to build a +12V Power supply from an old PC PSU: http://www.instructables.com/id/Convert-an-ATX-Power-Supply-Into-a-Regular-DC-Powe/ I am planning on using it to power my old cordless ...
-4
votes
1answer
68 views

How much current does IC7805 device draw?

I'm wondering how much current does IC7805 regulator draws in order to drive 1.5A load. Thanks
0
votes
1answer
62 views

Guidelines for using an unenclosed power supply?

What are the basic guidelines for safely using a "bare" unenclosed power supply (random example)? As a relative novice, my thoughts are: Definitely need a separate enclosure To avoid overheating, ...
2
votes
1answer
93 views

Why is AC earth connected to DC ground in laptop adapters?

If I were to plug this type of adapter into an ungrounded socket then voltage will leak to the DC ground through the AC filter capacitors. So why is the DC side not left floating? What are the ...
0
votes
2answers
37 views

Boost +12v from ATX PSU to ~13.5-14.5v

I understand that what I am doing requires the utmost care and that numerous precautions should be taken in completing a project like this. Out of necessity, I am going to fashion a car battery ...
1
vote
1answer
61 views

High voltage power supply and shunt regulator design

I'm building a high voltage power supply for a tube amplifier preamp and I need some advice. I need a power supply with a shunt regulator that is rock solid stable and dead quiet and outputs 600v ...
0
votes
1answer
34 views

Need to Determine Power Cable For Old Bose Found In Basement [on hold]

I recently purchased a home, and in the basement is a Bose Lifestyle surround sound system. The 5 speakers all plug into a base unit which I have determined is missing a power cable. In the unit, ...
0
votes
0answers
28 views

Power Supply for 6 servo and arduino

Hey Guys , I have 6 servos being controlled by arduino mega 2560 and I need to power them all. But I am struggling to decide my power supply components. I have one power adapter which provides 8v ...
-1
votes
2answers
116 views

Please help me to elliminate mistakes in linear power supply design or improve it! (LM723/7805))

So I decided to build power supply unit for my modular synthesizers. 2-in-1 Design: +/-15V (3A each) and +5 (1A) for TTL logic ICs modules. I started from enclosure, learning the SolidWorks in the ...
2
votes
1answer
89 views

I2C camera not working 100% of the time

This is my stereoscopic system: I'm using a zedboard to pilot two i2c-camera MT9D111: http://www.dragonwake.com/download/camera/MT9D111/mt9d111_rev5.pdf Camera PCB Information: ...
9
votes
4answers
1k views

Hacking Circuits Together Using Existing Schematics

I am working on a prototype using existing breakout boards from open source hardware manufacturers (Sparkfun, Adafruit, Teensy etc...). Everything is going great! I am at the stage where I'd like to ...
0
votes
1answer
17 views

Common cathode laser diode pin connections

I have a question relating to the operation of a laser diode within an optical pickup head that includes both a laser diode and photodiode. The Optical pickup head is the HOP-1200W and I am ...
0
votes
1answer
28 views

suggestions for solar charging battery-operated device

My battery-powered wireless device draws about 50mA @ 5V. I’m thinking of powering this off a 12V 7Ah SLA battery that is topped up with a small solar panel (12V, maybe 500mA or so). 12V to 5V will ...
0
votes
0answers
44 views

Force voltage, measure current

When using a power supply, they often come with a standalone mode and a FVMI mode. FVMI apparently stands for "force voltage, measure current". What does that exactly mean and how is it different from ...
-4
votes
0answers
67 views

What are some of the more popular ICs used to implement Digital Power (not digital power supplies)? [on hold]

I’m looking for products or product families that are well supported by intuitive design tools since this is a new subject for me and I’m a bit lost. Working on project that needs several rails.
0
votes
1answer
32 views

What AC-to-DC adapter would I need to power two of these battery (3V) powered door contacts at once?

I'm new to electrical wiring. I understand circuits, soldering, and basic wiring in parallel / series but calculating and understanding draw, resistance, etc. is new to me. That being said, I have ...
0
votes
1answer
54 views

the maximum and minimum output voltage of op-amp

my question is a bit specific, I have done the research but I got confused. I am trying to measure the current using current sense resistor and a current sense amplifier INA 210 . my measurements ...
-1
votes
1answer
53 views

What happens if I connect a solar panel and an AC/DC PSU in series?

I'm thinking about connecting the DC12V output of an ATX PSU with a solar panel in series. I want an always-on power source with as much power coming from the Sun as possible.
0
votes
3answers
77 views

How to correctly wire this transformer for 240V?

I have an old transformer (without any details about brand and model) with dual primary windings. I need to set it up to take 240V, but I am unsure about the correct way to connect the windings in ...
1
vote
3answers
60 views

Powering and operating dual electric linear actuators

I am in the process of building a height-adjusting desk. I am pretty good with computers (I'm a programmer), but I never learned much in the way of electrical engineering. I recently purchased two ...
-1
votes
0answers
77 views

Powering a Magic Mirror

Background: I am trying to create a magic mirror similar to this: Problem: I need to power two devices, one monitor and one raspberry pi. My approach was the same as in the article (which also ...
2
votes
3answers
219 views

Where are these 50Hz noises from?

Circuit structure: An AC to DC power converter MeanWell 220V to 5V. The output is 5V. The power grid runs at 50Hz. We build DC-DC converters(Power Module) with multiple orders of Low pass filters ...
2
votes
4answers
93 views

Do I need a galvanically isolated step-down DC-DC converter to power my digital electronic from a battery pack that powers also the electrical motor?

I have a battery pack with lithium ion cells. The battery pack has a maximal voltage of 84V (it goes from 84V to ~50V -> depending about the current state of charge). I use this battery pack to ...
5
votes
1answer
178 views

In TI reference design, why the gnd1 and gnd2 of isolater connect with a cap?

In this circuit, the gnd1 and gnd2 connected with a cap c27, why?
3
votes
3answers
103 views

Power supply filter choke failure - how and why?

Trying to repair a non-working Fiber to Ethernet Converter. When connected to power, the unit made a hissing/sizzling/scratching sound and the all LEDs glowed dimly. I isolated a small surface-mount ...
1
vote
4answers
102 views

Benchtop circuit breaker

I repair electric appliances and tools. Every once in a while, the main circuit breaker trips when I plug in a device. I don't want to prevent a circuit breaker from doing its job, but I would prefer ...
-1
votes
1answer
62 views

Something wrong with a 30 vdc variable power supply design

Recently I have designed a variable 30 vdc output power supply When I tried it on the breadboard it worked fine and gave me a maximum voltage around 29.8 vdc When I tried to design the PCB ( its my ...
0
votes
0answers
19 views

How do I configure PSB-330T in parallel mode? [closed]

I have a PSB-330T Triple Output power supply. I need 4 amps @ 22 V for a project that I am working on. This power supply says that I can run the power supply in parallel mode to output 0-30 VDC @ 6 ...
0
votes
2answers
57 views

Vout = 12V, Iout= 15A, 180 W Switching regulator [closed]

I have experience of designing DC-DC converter upto 5A. But now for one of my application, I need to design circuit with following specs: Vin = 24 - 25 V, Vout = 12V, Iout = 15A, Pout = 180W So, ...
2
votes
1answer
36 views

Battery charger output power higher than input?

i would like to ask about battery charger i saw at work :) the plate on charger says: Input voltage 3 phase ac Min 400v Nominal 400-415v Max 456v Input current 20A Output 110v DC 9kW 28v ...
0
votes
3answers
97 views

Looking for right component in my simple diagram

I am not electical engineer therefore stumbled upon this simple issue. In need to activate a 120VAC 1HP motor from sprinkler timer that has 4 individual channels providing 24VAC up to 400mA voltage ...
14
votes
2answers
458 views

How does this wall-wart switcher work?

UPDATE I've provided a full outcome report in one of the answers below with an updated schematic and description of the operating principles as I've come to understand it. I'm studying switching ...
-1
votes
1answer
86 views

Maximum current to the circuit

The schematic of the wireless power transmitter is shown , The circuit works good. The inductor connected between circled nodes 1 and 1 is 24uH. (Note: both the inputs of FET are not shorted, they ...
0
votes
0answers
70 views

Using USB Bluetooth receiver with speaker

I built this USB/9V mini speaker: I want to add Bluetooth support to it, so I bought this cheap USB Bluetooth receiver. My plan was to remove the plastic casing and the USB plug and add it to my ...
0
votes
1answer
74 views

Power supply logic design [closed]

I have three power sources that supply voltages from 3 to 9 volts. This will be going into a positive voltage regulator for stable output. If the third source is present it takes precedence over the ...
0
votes
1answer
37 views

LNK304P unexpected output voltage

I trying to understand what problem with next scheme. I have a power supply which should provide +12V but in my case it's only about 5v in output (checked on 1-2-7-8 and Gnd pins). I have tried to ...
-2
votes
1answer
49 views

Bad if I use a Higher power adapter for a keyboard instrument requiring lower power and amps? [duplicate]

Can I use a 13.5VDC 1a power supply for a keyboard that requires a 10VDC 800ma power supply without ruining the keyboard? I was told that the keyboard would only draw the power and amperage it needed ...
-1
votes
1answer
42 views

Safest way to hook a 12V wall plug into a hot/ground source [closed]

I have no outlets in a room, but have a box that looks like it converts the 120V source into 12V as well as the 120V source. I need to get power to this adapter shown below, but am wondering what's ...
0
votes
2answers
74 views

Is it okay to use a power supply that provides slightly more voltage and amperage than what's rated? [duplicate]

To preface; I am aware that there are a lot of questions that are similar to mine. But I am finding mixed signals as well as jargon I don't understand; and I was really just hoping somebody could ...
0
votes
2answers
76 views

Split External 5V PSU 4 ways

New here + reasonably new to electronics - can solder + hack, but anything finer I need help with! Building a games rig out of an old console case. I'm looking to have the PSU outside of the unit to ...
1
vote
2answers
55 views

Supercapacitor Voltage Draw

If I am charging a super capacitor with buck converter, that is a 1 amp, 1-18 volt output, and the capacitor is rated for 2.5 volts, how do I stop the buck converter from feeding it more than 2.5 ...
0
votes
1answer
156 views

220 AC to 220 DC Converter

I am designing a circuit that will give me an adjustable 220DC voltage. The load is approximately 2kohms, so the maximum current that will flow is 100mA.And I have design restrictions, it needs to be ...
1
vote
2answers
73 views

Power Factor - What is it a characteristic of?

I always thought it was a characteristic of a powered device, rather than the power source. A generator (whether it's a station or a small petrol powered one) does not have a power factor. I've been ...
1
vote
3answers
70 views

How to use the power good signal properly?

I'm powering a circuit from a buck converter. I've seen that many buck/boost converters (for example, TPS62177) have a PG or power good output signal which ...
1
vote
1answer
62 views

Charging phone battery from DC supply

I am planning a project very similar to the one seen in the following gallery. (http://imgur.com/a/G7iww) I like the idea of having my phone plugged into the same unit for charging. My only concern is ...
0
votes
1answer
64 views

Adding 2 cooling fans to an amplifier circuit board

simulate this circuit – Schematic created using CircuitLab I'd like to add (2) 5v .41A cooling fans to this Vox bass amp. What Resistor/capacitor combo (R3/C4) would be best?
3
votes
2answers
74 views

Generating plus and minus voltages for op amp

I have what is probably a simple question. I have googled it, but the answer doesn't make sense to me. I am learning about op-amps and creating all sorts of circuits with my nice cheap 10cent op ...