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

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2answers
56 views

Looking for efficient battery supply to power 3.3V circuit

I have been searching everywhere for the best way to power my circuit and I can't find straight forward information. My circuit needs 3.3V and the maximum current it draws is 50mA. It will run at ...
0
votes
3answers
96 views

What is the significance of 0V output from a regulated power supply?

I am mainly interested to know the application of 0V output from a lab power supply. Which linear regulator IC one can use to get 0V output? Edit:The LT3080 datasheet says that it is adjustable to ...
0
votes
4answers
81 views

Can voltage be controlled in a fixed DC circuit?

If resistance is fixed in a DC circuit, can voltage still be controlled and changed from one value to another? Imagine this circuit, that has a fixed resistance of 1 Ohm, and the desired current is ...
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1answer
46 views

Elongate the power supply p4 connector [on hold]

I've got pico-psu, tiny little power supply for computers. Recently I've moved onto a new motherboard, connectors on this mobo are located further than before. So I had to elongate psu-p4 connector ...
-1
votes
1answer
40 views

19.5V, 5.13A power supply to replace 19.5V, 7A power supply? [duplicate]

I have this laptop: http://www.newegg.com/Product/Product.aspx?Item=N82E16834233058 It came with a pretty large and heavy power supply, so I am trying to replace it with a smaller one. The reason ...
-4
votes
1answer
85 views

Expressing a circuit in the form of block diagram [on hold]

I am doing an electronics project for 12th grade in electronics.This project is about water level controller.I have component list along with the description and I have soldered the circuit as told.I ...
0
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1answer
95 views

What caused my servo to burn out?

I'm working on a servo project. I connected 12 servos to a single Adafruit servo shield and plugged in a 5V 10 amp (http://www.adafruit.com/product/658) switching power supply to the shield. ...
1
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0answers
45 views

at89c51 power supply [duplicate]

I am making a project using at89c51. I used my mobile charger (output: 5V, 1A) as the power supply. Will my IC get damaged due to the high current? I asked cause, without loading the program I ...
0
votes
1answer
49 views

Power supply for Raspberry Pi

Before you tell me that the question has already been asked, only similar things have been asked. I need to power a Raspberry Pi with some electrical equipment attached to it. The Pi needs to run ...
0
votes
1answer
30 views

Repairing (possible) earthing/ground issue in computer PSU? [closed]

I've got a computer that will no longer power on. It used to be willing to power on quite randomly, and ran fine when it did. I'm not an electronics savvy person, but i've done a manual check on the ...
0
votes
1answer
62 views

Prevent EPROM powering from IO pin

I consider using a cheap Microchip 3-pin EPROM with single bidirectional data line as ID storage on various daughter boards. Since I don't want to waste daughter board connector pins on a device ...
-1
votes
0answers
40 views

How do I design a wave generator to produce a sine wave of 1.5 Vpp, 13 - 20 Hz? [closed]

How to design a wave generator to produce a sine wave of 1.5 Vpp, 13 - 20 Hz? I need to make a battery to produce above specified wave with a DC input of 12 V, 2A. Thanks in advance!
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3answers
114 views

Boost regulator from 3V to 14V; then two LDO to make a +5/-5 power supply?

I am designing a mixed signal circuit and I need +5/-5 dual supply for my opamps. Could the following configuration work, else what are my alternatives? ...
2
votes
2answers
126 views

BeagleBone Black - power supply sensitivity

I've bought a AC/DC adapter which per its specifications should output 5VDC and deliver 3A. I was going to use this adapter to power my BeagleBone Black (BBB) with. However, when I'm measuring the ...
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votes
2answers
62 views

How to Mount Power Supply to PCB

How can this 5V 3W power supply board be mounted and electrically connected to a custom designed PCB? Or will it be better to get this power supply board instead due to the right angled pins ...
-1
votes
0answers
33 views

Implications of directly using powerbank on mobile? [closed]

I have Nokia 6600 which is antique and I wanted to experiment with it. We get powerbanks to charge on the go which has an internal battery... Is it okay, to connect a powerbank (and perhaps solder it, ...
0
votes
3answers
121 views

Why do most batteries or circuits use a 12V supply?

I have seen most of the circuit using 12V supply, is there any reason behind this? Is there any reason to choose 12V in all systems like battery-powered devices?
1
vote
2answers
86 views

Changing the voltage of a power supply

I have an old laptop power supply which provides 3.5A at 20V. I want to re-purpose this for another project for which I require 3A at 5V. If I cut the output cable I'm assuming I'll find a +20V wire ...
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2answers
51 views

Running up to 40M (130Ft) of WS2801 IC LEDS

After many hours of searching the internet for information and gathering what I could, I have run into my final problem that I am having trouble finding an answer for. I have 40 Meters (130) Feet of ...
2
votes
3answers
193 views

Is my PSU design safe, what should I change?

Normally I would just go and breadboard the design out, but since this is using mains power, I would rather ask experienced people first. I want to build a desktop 170V DC power supply to fiddle ...
2
votes
2answers
119 views

How does R5 bias the zener in this SMPS circuit?

In the description for the circuit below from this data sheet for TNY268 off-line SMPS switcher, it says R5 is used to ensure that the Zener diode is biased at its test current and R6 centers ...
0
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2answers
89 views

Power supply for 144 LEDs in parallel?

I appreciate any help as I try to figure this lightbox project. I need to wire up to 144 3V (built-in resistor) LEDs from flickering tea lights (normally battery powered). Not sure how many to wire ...
5
votes
2answers
97 views

Could a modified sine wave inverter destroy/damage the AC adapter for a laptop?

I recently encountered a scenario where I attempted to use a Energizer EN500 modified sine wave inverter to provide power to a Dell 180 watt AC adapter. The circuit powering the inverter was 12 volt, ...
1
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2answers
81 views

Can I reasonably expect a USB connection manage a 3.7 Volt 6-8 Watt output at 1.9 Amps or less?

I am thinking about making a 510 Vape eCig mod that runs directly from USB. The cart I would like to attach to the 510 head has a 1.8 ohm resistance atomiser in it and wants to see under 2Amps (or it ...
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votes
1answer
47 views

Are LED drivers inter-switchable?

MR16 type LED bulbs need their halogen counterparts' driver replaced due to low power consumption and they require an "LED driver" that can deliver the necessary wattage. On the other hand, LED ...
1
vote
2answers
98 views

What is used to reduce to 220v AC voltage to lower voltage for DC conversion

I want to build my own power supply section for my project. The condition is that I want to connect the 220V AC power source to the board and the power section is about to reduce this 220V to 5V, 9V, ...
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votes
4answers
69 views

How can I connect two different DC power sources together?

How can I connecting two different DC power sources together? for example 15Vdc(5Amp) with 5Vdc(2Amp). I want to make one DC source (20Vdc,7Amp) by more powerful supplies.
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votes
2answers
109 views

how to design transformer less power supply? [closed]

I want to desgin a 5V,0.5A transformerless supply (minimum components) for mains 100-260Vrms, 45-65Hz? I found several ways to do it which are mentioned below 1. resistive power supply - Microchip ...
0
votes
1answer
95 views

Reduce power noise on AVR

I'm working on an AVR computer, everything works fine, except when I tap any ground point with my finger (there are a lot of them exposed), the MCU (an ATMEGA328) hangs for a brief second. I have a ...
0
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2answers
62 views

Using the same power source for microcontroller (arduino) and rest of the circuit?

I have an Arduino, it controls a 6V DC motor and 12V DC solenoid (which only really needs 7V for what its doing). Originally I wanted to use 1 rechargeable 7V battery (or 9 or whatever the closest I ...
4
votes
1answer
81 views

Characteristics to look for in a bench power supply to use in microcontroller development

I'm doing some microcontroller development, mainly for education and as a hobbyist. So far I have powered it all from USB-power or 5V wall warts and regulated it down with 1117's or similar ...
0
votes
1answer
48 views

Powering a load with specified maximum current of 300mA. Is it safe to use a matching voltage power supply with a higher current rating? [duplicate]

I just bought a guitar amp that can be powered by a 9v battery or a 9v power supply. The instructions that came with the amp specify that the power supply should deliver 300mA maximum. As far as I ...
1
vote
1answer
51 views

Driving a linear actuator from a home automation system

I am not exactly an expert into electrical engineering. I have a Linak LA12 IC linear actuator, and am trying to drive the motor from two outputs on my home automation system. The home automation ...
4
votes
2answers
72 views

Safety concerns over generic switching power supply units

I'm looking for a more stable power supply for my 3d printer. I've recently come across the following kinds of switching power supplies. They seem to come in all sorts of different sizes and ...
1
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2answers
72 views

Can I use a double insulated power supply with a metal framed sculpture with LEDs

I have built a tree shaped wire framed sculpture with LED lighting. The LEDs each have a positive supply to the anode via an insulated wire and resistor, and the cathodes are connected directly to the ...
1
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1answer
58 views

Arduino and Ethernet Shield Power Supply

I have Arduino Uno and Arduino Ethernet Shield. I have four sensors. I am reading sensor values and post it to an ip address. Everything works fine. But my problem is about power supply. When i plug ...
0
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2answers
36 views

Passing control voltages to multiple isolated power supply channels

I'm designing a programmable bench power supply (PS) that has multiple isolated channels (each powered by a separate transformer winding). I like the idea of isolated channels so that multiple ...
3
votes
1answer
77 views

How does feedback in power supply work considering output change delay?

I'm designing an SMPS with a PIC microcontroller, but this question applies not only for SMPS but to linear power supply too. I set a desired output voltage in my microntroller and then I perform ...
0
votes
1answer
60 views

Can my dead Lead Acid batteries be reused?

I have two 12V 4.5Ah sealed Lead Acid batteries from an old electric scooter. The scooter is a decade old, and packed up a few months after purchase. The batteries were literally left as is for ...
1
vote
2answers
108 views

Will my 12V power supply ever burn these IR leds blinking at 38kHz even without a resistor?

I'm new to electronics, my background is mostly on the software development side... so go easy on me, as this might be a really stupid question. I just want to be sure what is safe to assume and what ...
0
votes
1answer
45 views

Known voltage/current source

I am working on an EVM for an electricity meter. Its manual says the EVM requires a known voltage and current source for the calibration. I bought a power supply and measure the output of the PSU by ...
0
votes
2answers
56 views

Can you use rectifiers from different transformer sources in parallel?

Consider following circuit: simulate this circuit – Schematic created using CircuitLab It uses two transformers, rectifies their output separately (so that they can't interfere), filters ...
0
votes
2answers
57 views

Powering SMD 5050 strip via LM2596 DC/DC converter

I decided not to order / use the power supply typically sold with SMD 5050 kits. I heard a lot of explosion stories regarding those dodgy stuff. I want to make my own (power supply to drive SMD 5050. ...
3
votes
2answers
141 views

LDO vs switching regulator

We've currently got a PCB that needs to power a modem and a microcontroller. The PCB is powered via a battery (12V - 30V range). The modem and the microcontroller have separate power lines. The ...
-1
votes
1answer
61 views

I am getting a live in my earth of my extension cord socket [closed]

I am getting a live connection in my earth port of my extension cord socket. I opened up it and I am seeing this. Please help me find what is the issue.
2
votes
2answers
72 views

How to customize the 'write' to instrument?

I'm communicating with Power Supply RIGOL DP832A via Ethernet. ...
2
votes
2answers
108 views

5V DC over data lines

I am prototyping the below diagram and using the following Common Mode Choke from Murata 50475C (4.7mH DCR 0.7R). When I input a signal on U1 Point B 3Mhz D = 50%, I can see AC coupled signal on U2 ...
0
votes
1answer
51 views

12V UPS power supply and battery [closed]

I'd like to use a Tripp Lite PR40 as a backup 12V UPS by connecting it to a battery before a couple motors in parallel. The battery is 125AH deep cycle AGM. Can I do this? The manual says that the ...
0
votes
1answer
62 views

Supply voltage drops AFTER connecting to device [closed]

I have a 19V 2.1 amp (power mentioned is 45 watt) laptop adapter connected to a 19V 2 amp laptop (in description power mentioned 10.2 watt). When I plug the adapter, the multimeter shows the rated ...
0
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4answers
174 views

home socket with DC voltage

I'm wondering why, in a standard house, instead of using many low power AC-DC rectifier, there isn't a big (like 12V 20~50A) AC-DC rectifier which supplies some wall socket with a DC voltage? In the ...