Questions tagged [power-supply]

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

645 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
0
votes
0answers
51 views

Getting rid of a 3-second shutdown of 12V power

A friend of mine is wondering if it is possible to get rid of a 3-second power shortage when you start an old vehicle (press the starter). He is using the power from the 12V supply from the vehicle ...
0
votes
1answer
82 views

Specifying relay for breaking injection molding control circuit

I have an application which requires me to break a 24v signal running with low current (60ma being the absolute max). The signal stays on allowing a large hydraulic motor to close a mold with great ...
0
votes
1answer
141 views

4 wires from from power brick to 2 wire fixture

I am attempting to hook up a 12-volt water pump to an 110 outlet. I bought an AC/DC switching adapter to make the conversion. Intended on wiring a black and red wire to a black and red wire. But my ...
0
votes
0answers
408 views

Has Anyone Ever Gotten a Delta DPS-400AB-5 A PSU to Work Standalone?

I got my hands on a Delta Hot-Swap Server Power Supply that's capable of 400W or 33A on the 12v rail. I've been tinkering with it for a few hours now and can't seem to find what pins are for the Pson ...
0
votes
1answer
52 views

Question about 240V / 5VDC PSU wiring

I am making a Playstation Raspberry Pi project and I am using a new PSU inside the PS1 case to power the Pi. See link to PSU below: https://www.amazon.co.uk/dp/B01DDTYMAS/ref=twister_B01DDTYM9E?...
0
votes
0answers
44 views

Substitute power supply for batteries in motor controller

I'm rigging up a demo stand that will use a (large) model RC car. We can't use its batteries since we can't get to the unit to recharge, so we're using a power supply instead. The requirement is for ...
0
votes
1answer
64 views

What factor limits power supply output power?

Why is it many DC power supplies (for simpler systems that don't need amazingly clean power, for example) have a very low rates output power, e.g 12V 1A? What makes a supply consisting of a 20:1 turn ...
0
votes
0answers
369 views

Best And Cheapest Way To Isolate Multiple DC Power Sources

I need a way to create/simulate (by simulate I mean fool the circuit in to thinking they're isolated), at least 8 5v 1A power sources in the cheapest and easiest way possible. I have a power source ...
0
votes
0answers
48 views

Efficient methods of Chaining Uninterruptible Power Supplies

Let's assume I have 2 identical UPS and deep cycles are not preferred for battery lifetime. I can think of 3 different methods to combine. Which one of these methods should I be using under which ...
0
votes
0answers
286 views

Using 250V PS2 Power Supply to power Raspberry Pi 3

I'm building a RetroPi Box from an old Playstation 2, and I'd love to recycle as much of the PS2 components as possible. My PS2 (first generation model) has a power switch for its 250V built-in ...
0
votes
0answers
170 views

Battery backup circuit

I want a battery back up for a monitoring system. Power supply is 4.8V-6V. Battery is 4.8V-6.4V (with 100uA leakage it goes 4.8V after one year). I designed this circuit but on simulation it ...
0
votes
2answers
343 views

RCA AH5 AC/DC adapter switch polarity question

I apologize in advance for asking this, as this should be answered via Google search but I'm not finding the correct manual for the RCA AH5 power adapter. And before I fry anymore instruments by using ...
0
votes
0answers
226 views

Principle for converting dual power supply to single

I was recently attempting to build a voltage controlled oscillator from this website: http://www.schmitzbits.de/vco4069.html. I struggled with it, for various reasons, and eventually found this ...
0
votes
0answers
112 views

-2.5V Power Issue

I'm having some issues diagnosing one of my PCBs. My goal is to provide an opamp with +-2.5V. I'm getting 5V (3A) from a DC barrel jack in the circuit. I'm using the MAX735 to create -5V and feeding ...
0
votes
0answers
206 views

Dual Power supply from a Single supply

Currently i am doing a circuit for achieving voltage regulation. Please refer below for the same. I am looking for a split voltage supply design using a single supply. On No-Load i am getting the ...
0
votes
2answers
39 views

Asymmerical measuring limits

I would like to know your perspective on the following: When measuring 24VDC both the lower test limit (LTL) and the upper test limit (UTL) are defined by either product, safety or 'common' ...
0
votes
0answers
63 views

marking on old transformer?

I've found this marking on an old transformer This transformer has input voltage selection for the primary and 34v centre tapped secondary, it is used for an old power supply. My question is: what ...
0
votes
0answers
272 views

DC 30v Adjustable PSU using Lm317

This is the adapter i got in My hand I need a cheap diy stable circuit for making an Adjustable PSU using LM317 Voltage Regulator. I got a adapter with output power supply of DC 30v 400mA. I need a ...
0
votes
0answers
68 views

What external power supply should I use for Arduino modules?

I build a data logger with Arduino MEGA, SD, Ethernet, RTC, GSM, display module, and thermal printer. I am facing problem with unregulated power supplies. I have tried many power adapters, phone ...
0
votes
1answer
121 views

Power supply and motor drivers problem.

I have a 24 volt 6.5 amp power supply which I am using to power a stepper motor driver which is rated to 3.5 amps max. Will directly connecting the two cause a problem or will the motor driver only ...
0
votes
1answer
58 views

how to find the active power supplied by an induction machine

3 phase, 8 pole, 400 volt, 50 hertz induction machine. supply current 52.8A angle -72.5deg How do I determine the Active Power supplied by the machine? Is it as simple as (400/root3)*52.8*cos(-72.5)?...
0
votes
0answers
416 views

Safety of zener diode based non isolated power supplies

Are the following zener diode based non isolated power supplies safe to use with a touch based application? I would assume, the circuits are safe if they completely sealed (including the touchpad). ...
0
votes
1answer
133 views

design for portable pv charging for 97Wh lithium ion battery

The manufacturer of my medical device has provided a Lithium Ion battery with these characteristics: 97 Wh Output 3.75A Input 100-240V, 50-6-Hz, 1.0-1.5A Protection overcharge, overdischarge, exess ...
0
votes
0answers
44 views

IEEE standards household electronics

I'm new to the community, and new to building electronics in general. I am mainly concerned with grounding of line voltage transformers -- I am sure there is some IEEE standard on this but I have not ...
0
votes
0answers
104 views

Using 2 LiPo 18650 with L7805CV, is 7.2V enough to run the device?

I am interested in powering a robot using two LiPo 18650 batteries, in addition they need to be fed through a regulator to produce a 5V output for a microcontroller. The problem is the regulator has ...
0
votes
0answers
523 views

Problem with the relay switching

I am trying to switch on and off LED's with the help of a relay. The relay I am using is 24VDC SPDT relay and the LED is 12VDC LED. When I switch on the 12V supply the yellow LED should glow since ...
0
votes
0answers
28 views

Common rectifier (or source) to power testing equipments

I was thinking of a design of an all-in-one box that contains a DIY Oscilloscope, a DIY frequency generator, a DIY bench-top power supply (by a buck converter), and a multimeter (broken out from the ...
0
votes
0answers
96 views

Reverse polarity protection non-isolated power supply

I'm trying to design a circuit with reverse polarity protection. I have found numerous of examples but I can't get it to work for me with a non-isolated power supply. I'm open for suggestions. I ...
0
votes
0answers
2k views

Is this resistor sufficient as dummy load in an ATX 250W Dell PSU?

I have attached a 20 Ohm resistor to my Dell PSU on the 5V rail since its a 2004 PSU and most of the current is on the +3.3V & +5V rail. I have seen on most youtube videos where they mention using ...
0
votes
1answer
41 views

Powering two 5v 1amp devices from one battery

I'm looking to power a rPi Zero W and a tomoko 87 mechanical keyboard both of which take 5v power (I know the rPi needs 1amp, not sure about the tomoko 87 as the description simply says "5v DC"). I'm ...
0
votes
0answers
182 views

choosing the right power adapter for LM317 regulator for battery charging

I looked at the standard LM317 setup at http://www.learningaboutelectronics.com/Articles/LM317-voltage-regulator (where the center of a voltage divider is connected to the adj pin and the inputs and ...
0
votes
0answers
679 views

How to get 6V DC motor running using PWM through STM board

First image is edit of image 2. Use this circuit to build unidirectional motor control using PWM. Ignore 3v pin, MOSFET can be any mosfet having small threshold gate-source voltage eg, 30N06, ...
0
votes
0answers
63 views

Correct name of a 12v power strip socket

I'm trying to locate one of these black strips: I purchased it as a component part in the uk but they don't sell them anymore. It supplies 12v lights (attached to the output of a transformer. Any ...
0
votes
1answer
69 views

Does ATX specify the load currents?

I find it difficult to see the elecrtical specs of ATX PSU. You can, for instance, have this cheap block or another one but their homepages just say that PSUs are ATX-2.2/2.31 compliant and I see no ...
0
votes
0answers
150 views

Power supply for Precision Current Source for Medical Instrument

I am trying to implement power supply for constant current source(LM334) for medical application. I have 24V,3A SMPS to generate required output (38V) to operate LM334 Constant current source of 10mA. ...
0
votes
0answers
355 views

Negative Input DC-DC power supply

I have a requirement of DC DC power supply where the input voltage is -48VDC and output voltage : +5V and -5V with output current 4A and 3A. Is it correct to use a DC DC power supply of more than 35W ...
0
votes
0answers
42 views

Controlling 2 PSUs with an mCU

I'm finalizing my plans to make a physical control panel to interface 2 of my 3D Printers to an embedded Linux device. (Just minimal physical controls since 95% of the controlling will be done via a ...
0
votes
0answers
91 views

Bidirectional Monophasic 2 Motors Driver with ULN2803A and Relays

I am a hobbyist who is trying to build a DIY like car robot controlled via 2.4GHz radio and decided to use ULN2803A which was unused on my electronics equipment and has 8 outputs 4 for each motor and ...
0
votes
2answers
69 views

Designing high current test set up

I need some help designing a high current test. I know just the basic concepts of circuits so any help would be appreciated. I currently have a programmable DC power supply that can supply up to 220 ...
0
votes
0answers
292 views

How to get a stable 5V Supply to get stable readings from ADC on Raspberry Pi using SPI

I have been working on a way to get very accurate measurements of the tilt of a surface. The signal I use is a bipolar one that ranges between +/-2V. I started by trying the MCP3008, but the since ...
0
votes
2answers
348 views

Chassis grounding for multiple daisy-chained units

I'm designing a system that provides power/ethernet/serial for up to 5 daisychained units. All of the boxes will be metal and my initial plan is to run power and signal ground through the 14 pin ...
0
votes
0answers
411 views

LTC3780 voltage/current limit indicator

I recently bought an LTC3780 circuit from China to build a variable power supply. I would also like to have voltage/current limit LED indicator there but every tutorial I found on the internet ...
0
votes
0answers
445 views

DIY power supply 4 amps and 5 Volts

How can I make a power supply that is able to give 4 amps in terms of current and 5 Volts fixed? I've made a power supply before with variable voltage however the amp output never went above 1A. Which ...
0
votes
0answers
57 views

Using somesort of a switch between 230V AC and 24V DC

This is a vary basic question which will probably be answered in a blink of an eye by some of you. I have a few hardware devices which have the same wiring schemes. The only difference is some of ...
0
votes
0answers
117 views

Op-Amp Dual Supply Generation

I am planning to generate +/-9V using LT1026 as shown. These configuration is shown in datasheet of LT1026 Charge pump (page 5). But my question is if I add one more IC in parallel if I need ...
0
votes
1answer
116 views

How to verify if power supply is enough to handle power consumption spike?

I am looking to find out how to analyze what will happen to a power supply if my load suddenly draws more current. On my current example ( but that also happen to me with different components ) For ...
0
votes
1answer
46 views

multiple peripherals though a single USB type C

I'm trying to build a TV set-up box composed of several peripherals such as: computer(raspberry compute module), wireless audio transmitter and a DSP each with various power requirements. I would ...
0
votes
1answer
46 views

Given specific equipment wattage, and the capacity of an industrial grade portable battery, how can I determine theoretical run time?

I am located in North America and all equipment is standard 110-120v. The 4 appliances are: 2 Pioneer CDJ-800s. According to Pioneer's website, they operate at 21w (I assume this is PEAK ...
0
votes
0answers
274 views

Frequency of operation of typical laptop's 5V switching regulator powering USB ports

What lowest frequency should I expect from a modern laptop? I need to calculate a filter for powering some analog circuitry from USB.
0
votes
0answers
224 views

3kW power supply from 230Vac input

What kind of power supply topology(s) should you use for a CC and CV programmable power supply with the following parameters? input: 230Vac output: 0 - 1000Vdc / 3A max.