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

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1answer
41 views

Need to connect neutral wire?

In 3 phase machines have L1,L2,L3,N and PE(Protective earth).some time Neutral wire is not connected to the power supply.But,Machine have a neutral wire.What will happen if not connect neutral ...
0
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1answer
41 views

external power treatment in the powered board

I'm working with an audio board (company project) that is powered by a external 9V power supply. Actually an ordinary AC adapter, like this one: http://www.sweetwater.com/store/detail/MAud9v500. The ...
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0answers
64 views

How can I speed up reading [on hold]

I am working on a project using an Arduino as a web server. Code: ...
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1answer
98 views

Why is this multimeter power supply short circuit when off

I have just been following some traces around inside an old digital multimeter (AVO DA116). I was poking around at the LCD driver chips (MC14543CP) when I noticed that the power supply was short ...
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1answer
35 views

power supply multimeter voltage test differ from the label

I have a router's power supply. 12 Volts is written on the label. When I use a multimeter the voltage is 16.80V. Should I use it to power a small LED strip that requires 12V?
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2answers
68 views

Where to connect the power supply

Apologies if this question has already been asked or it's too simple. I am starting out on Microcontrollers and I have been looking at the following: https://www.sparkfun.com/products/9195 Now, I ...
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2answers
38 views

Led Strip Heating Up

I have an LED strip with 7.2 Wattage/m and the strip is 3 meters long. The led strip has R,G,B,+12v inputs and I have connected a 12V DC 1000mA power supply to the +12v and attached transistors to ...
0
votes
1answer
54 views

Designing power supply with 5v and 3.3v from a 12v supply with switching regulators

I have 12V DC coming in from a power brick and I need to supply 5V @ 1A for USB and 3.3V @ 5A max for mSata and PCIe. I basically need to make a small atx power supply that I can integrate on my ...
0
votes
1answer
41 views

Fan Control using Motor Driver, looking for suitable solutions

I want to control the speed of a fan (which is a 2-phase brushless DC motor). I am currently using a suitable power supply to run the fans. My source is a Data Acquisition device that outputs up to ...
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1answer
50 views

I have one central 300w power supply running at 5v. How can I split this into 3 equal “ports” that use 20amps each

I have one central 5v 300w power supply. I want to basically split the power among 3 different ports instead of blowing the whole 60 amp load. How can I share the power evenly. Thanks!
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0answers
54 views

What power supply topology should I use?

I need to design a power supply capable of providing a maximum of 1800V at 0.02mA. The input voltage ranges from 135 to 250V DC. What topology is recommended for this voltage? Flyback, buck?
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votes
3answers
282 views

Does it make sense to power multiple 12V devices from one single power source? [closed]

I have a number of devices (External hard disks, switches, router) on my desk. Each ones comes with a own power supply. This leads to a waste of space and a mess with all the cables. Does it make ...
0
votes
1answer
80 views

Why use two power sources when designing a voltage regulator using a zener diode

I am currently designing a voltage regulator using a 5V zener diode. I am wondering why some people choose to use two power sources instead of one, what would be the benefits of this ? the circuit ...
0
votes
2answers
107 views

Voltage regulator from 24v to 3.7v [duplicate]

I need to build a simple voltage regulator that can drop voltage from 24V(from a DC power supply) to 3.7V and supply at least 2A or more(up to 5A if possibile). Can I just use a 2 resistor voltage ...
0
votes
0answers
50 views

Powering LEDs from an ATX PSU

I've been thinking of replacing my ugly chandelier with 5 meters of LED strips. While browsing webshops, I've seen cheap 12V 6A (=72W) LED power supplies, which would be just about enough to power the ...
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0answers
30 views

Grounding A Circuit of a Power Tool Battery Charger to Use as Car Battery Charger [duplicate]

I took a charger that matches what I need to charge a car battery. The charger uses a transformer and has 3 connections, as does the battery it's intended for (+/-/T). When I plug the + and - alone ...
0
votes
3answers
71 views

Do fuses affect a PC PSU's amperage output?

I have a PC PSU powering a load that should pull 20 Amps. I put a 10 Amp fuse in series with the load and the PSU. However, the fuse simply will not burn, and the PSU continues to supply the load, ...
1
vote
1answer
49 views

What can be the reason for a voltage drop across daisy chained RS485 servo motors?

We are using a set of RS485 servo motors(Robotis EX-106) for our humanoid robot. This motor has a 4 pin connections namely Ground,VCC, D+ and D-. The Ground and Vcc terminals are from the power ...
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0answers
39 views

A power supply A with 10V dc ripple of 0.5mVr.m.s., POwer Suplly B 25 V Dc ripple of 1 mV r.m.s. which is better power supply? [closed]

A power supply A provides 10V dc with ripple of 0.5mVr.m.s. While the POwer Suplly B delivers 25 V Dc with ripple of 1 mV r.m.s. which is better power supply?
0
votes
0answers
59 views

Modifying an amp core type transformer

I am attempting to create a 220V AC --> 14.4V 2A transformer to revive a car battery. I took a core type transformer from a music ampifier and want to test it. I don't know how to wire it correctly ...
0
votes
1answer
50 views

Power adapter versus Power supply

I have a mini water-pump/motor hooked up to an LM338 (similar to LM317, but capable of higher current output). I set up the LM338 to create a 6.1-V output, from an 18-V input; this was done by ...
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1answer
69 views

Simple digital circuit schematic question

Below you'll find the schematic for a circuit I have to build and analyze tomorrow for a lab. simulate this circuit – Schematic created using CircuitLab (Note that the blocks I've shown ...
0
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1answer
32 views

Example circuit with an F12C20C dual rectifier?

I've salvaged a MOSPEC F12C20C Dual Power Rectifier from an old PSU. I've been looking for example circuits that would use this component, and an explanation of how it works but I've only found its ...
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0answers
35 views

High Voltage AC&DC transition on PCB

I'm designing a SMPS and drawing layout onto double-sided PCB. Due to mechanical features of design, both AC and DC current should have transition through vertically attached board. For example, input ...
0
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1answer
62 views

Fast Switching For UPS

Well I don't even know how to call this question, but the point is. I am making a DC UPS, and I want to be able to quickly switch from the wall supply to the battery supply, and I don't think a relay ...
0
votes
1answer
60 views

Class II isolated power supply (wall wart) — referencing the output to mains neutral?

If you connect the - terminal of a Class II (isolated) wall-wart-type power supply to the neutral of the mains circuit feeding the wall wart, will that cause any damage or hazards that I should be ...
0
votes
1answer
42 views

Reduce 160 Volts AC to 100 - 110 Volts AC (EL Wire Tape) Help

I am trying to put EL Wire Tape in a project that I am working on. I decided to go and build an inverter for 12VDC to 100VAC and that fell through. I couldn't find any guides that helped on EL Wire ...
3
votes
2answers
93 views

Ground Pour in Power Supply PCB

I'm designing and building a linear power supply for my tube headphone amplifier. Considering this should be HiFi, I'm trying to make it as good as it gets within "normal" building costs and without ...
0
votes
2answers
59 views

Specific differences in electronics for similar spec 12V power adapter/suppy? [duplicate]

I would like to understand the specific differences in power adapters that have similar input/output spec's but have different described purposes. In other words, can I use any power supply/adapter as ...
5
votes
3answers
379 views

What is the name of a footprint that is designed to let you cut the trace between two nets?

I am designing a board where I want to have the ability to separate the connection between two power net's by cutting a trace. Originally headers were meant to be used but due to size constrains I ...
0
votes
2answers
85 views

Ground Loop? Noise from 12v to 5v converter manifest in bluetooth audio source

I've created a custom, bluetooth audio harness for my Jeep WJ using off the shelf parts. Amp - Clarion XC1410 Converter - 12v to 5v buck converter Bluetooth Audio - Logitech Wireless Speaker Adapter ...
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2answers
113 views

ATX POWER_OK signal not provided to molex connected peripherals such as HDD

From Wikipedia: The Power Good signal prevents a computer from attempting to operate on improper voltages and damaging itself by alerting it to improper power supply. The ATX specification ...
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0answers
51 views

Shortwiring a PSU WITHOUT Paper clip [migrated]

So, in a haste to power up the PSU after the paper clip test, I cut all the wires from the 24 pin connector and tried to connect the green and the black wires directly. However, the fan on the PSU ...
3
votes
5answers
242 views

Selecting input voltage for 7805

I generally use switching 12V power supplies for my circuits since they are so common, but I understand the 7805 can take a lower input voltage. If I gave the 7805 a lower input voltage (i.e. 9V), I ...
1
vote
2answers
41 views

Voltage of a sine wave given max wattage rating

I would like to test a speaker by giving a sine wave of 200 Hz. On the technical datasheet following are mentioned Sine Wave : 30W Maximum music load : 60 W Frequency Range : 40 to 2000 Hz ...
0
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1answer
36 views

Positive to negative rail if Opamp has Single Supply

Can the output go to -5V to 5V if an opamp has a rail supply voltage VDD = 5V and VSS = 0V
1
vote
2answers
87 views

Electrical Induction, what are the cable limits before it becomes a problem

I have a little hobby that has 3 power cables coming and going (each cable is 12V DC, 7.55 amp max). Now these cables are ridiculously long (approx 5m+) and the equipment having to be mobile is small ...
0
votes
2answers
157 views

Voltage regulator up to 100v? [closed]

I want to make a power supply that outputs 90v DC, and I was looking for a 0...100v voltage regulators, but I don't find any...? How can I achieve this if I can't find them? The input voltage of the ...
1
vote
3answers
77 views

Measure voltage difference between ground and DC floating power supply lines

110/220V AC to 12V DC switching mode power supply (metal enclosed, input is 220V with separate L,N and ground.) Measured voltage difference with a multimeter between V- and V+ 12V DC as expected ...
1
vote
1answer
86 views

Reverse current protection for a battery operated circuit

I'm planning a hobby project with the following characteristics 3.3V circuit, battery operated (by regulating standard AAA batteries) Most of the time in "sleep" mode, so I need very small quiescent ...
1
vote
1answer
53 views

How to detect the power source when multiple power sources are available?

I have very little background in electronics, I'm from software background. I'm interested to design a system in which there is an 8-bit micro-controller which should get powered from two different ...
0
votes
4answers
107 views

Op-Amp based power supply, what powers the Op-Amps?

I have seen some schematics of power supplies. They contain Op-Amps inside to implement negative feedback. I was wondering, hmmmm what powers the Op-Amps so they can actually work and implement ...
2
votes
3answers
123 views

How can I add power to a USB socket?

I have a USB device that perfectly works when it's plugged into a Tower Windows-PC, but doesn't work when it is plugged into an old Linux Laptop. Is there a way to add more power to the USB device? ...
1
vote
1answer
119 views

simple battery back-up power path design idea

I need an application with back-up battery. Like UPS when power go down device will work with battery. There are chips with power path option but it is diffucult me to get components from outisde of ...
0
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0answers
27 views

UL ETL IEC certs

I finally got to the stage where I can design some usefull circuits, im starting to get into Power electronics, and im about to start designing my 1st switching mode power supply , and I want to do ...
2
votes
1answer
91 views

A circuit/component which can reduce own resistance with increase of current

I'm trying to build following circuit for single-phase 230VAC grid: 0---(LOAD)---(MY_DC_CIRCUIT)---Phase MY_DC_CIRCUIT doesn't have its own power source. The power is considered to be taken from the ...
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2answers
55 views

Power up sequence circuitry

I need to power up an IC and i have two or tree power supply. Datasheet says me: Vdd1 and Vdd2 are turned on at the same time, make sure vdd1 becomes stable before vdd2. My power supply have EN ...
0
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1answer
40 views

What is the theoretical minimum size of solar cells on wrist watches? [closed]

I was wondering what is the theoretical minimum amount of surface area in solar cells one would need to power an analog display wrist watch assuming the following scenario: The watch's face has a ...
1
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2answers
122 views

Bench DC power supply output

I recently purchased a ATTEN APS3005D Regulated DC power supply from eBay and I'm having some odd and potentially alarming results that I'm trying to get my head around. Note: I'm testing this ...
1
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2answers
65 views

What type of power supply should i use for led strip?

I like using led strips to create various pieces of lighting around the house for myself and also for friends. I buy the cheap 3528 analog reels from Amazon, (the stuff that gets shipped straight ...