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

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9 views

Power Supply MultiChannel Floating

I have been looking into DC power supplies and can't seem to find how to do multi-channel floating +/-. Correct me if I am wrong but you can isolate two channels by having a center tap on a ...
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40 views

Help needed regarding Digital power supply design

I was designing a 0-35v/6A power supply with keypad entry with microcontroller.The main idea is to output calculated output voltage by a 12 bit DAC and feed it to an op-amp configured as non inverting ...
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2answers
229 views

Multimeter reading 0 and drawing too much from DC power supply

So I've got a circuit that requires both 5V and 3.3V so I bought a 5V 2A AC/DC converter from a store, which I will add resistors to later for the 3.3V. Before I connect it to my circuit, I wanted to ...
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1answer
49 views

Possible reasons for DC fan failure

In my design I have a constant problem with failing 24VDC fans. The fans are used all across the machine, however they fail in only one position, so I excluded faulty fan model as a source of problem. ...
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1answer
57 views

Is possible to implement this op-amp split power supply design? [on hold]

Hi all, I have a op-amp charge pump circuit that could produce up to 3A 1000Hz AC current regardless of load. This current is used to test a battery (V1 in the image). The weird part is that I have ...
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2answers
72 views

Floating Collector

I am working on a project where power to the 5VDC supply to a micro can be interrupted during operation (by user). I need to signify to the micro that it is about to lose power so it can perform ...
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1answer
42 views

Electrical Part on Connector Board ME302C for Asus Memo Pad

I have some unusual question: does someone know [![Part1][1]][1] what kind of electrical part is on that pcb (encircled)? This is a connector board (ME302C) for ASUS MEMO PAD. The part is ...
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1answer
37 views

Question on Current Sensing Resistor in Lead Acid Battery Charger

I was reading several threads on Lead Acid Battery chargers and encountered a circuit diagram given by Russell McMahon here http://electronics.stackexchange.com/a/152641/93631 First of all, I would ...
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3answers
259 views

What is a clamped inductive load?

As I'm reading about switch-mode power supplies (SMPS) I keep coming across the term clamped inductive load. You'd think there would be a clear definition that would pop up as the first Google hit, ...
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1answer
51 views

How do I limit voltage from two power sources?

I am designing a system to mist my outdoor air conditioning units during the summer. I will be powering a low voltage irrigation value using the low voltage from the AC controls - 24 VAC. I have 2 ...
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1answer
55 views

Buck boost converter output voltage dropping over time

I have a TPS61222 Buck boost voltage converter, in a circuit intended to boost a 3.7V battery source to 5V. The output voltage however, is consistently less than 5V - scoping shows a 4V signal with ...
3
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1answer
127 views

Decoding Transformer circuit for power supply generation

I am referring below schematic of transformer to generate power supplies in the system. Transformer used is step up transformer (Input-5V, Output: +/- 12V, +/- 48) But I am not getting how ...
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1answer
66 views

Circuit for Current Injection and Voltage Reading

I am developing a sensor based on the principle of EIT (Electrical Impedance Tomography). For the project, I need to inject into the material I am using, a constant current between two electrodes ...
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0answers
66 views

How to construct a DC Home Supply System

So I've been thinking hard of how to construct a DC socket to use in combo with a solar setup at home so as to cut losses in using inverter plus DC appliances seem to be generally more power efficient....
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1answer
28 views

Generate +2V Offset on a +12VCD Supply line

I have a 12VDC @50mA_Max supply line. I need to inject a +2V 50us offset pulse to the +12VDC line, having an effective +14V for 50us. I have access to an external power supply, where I can have ...
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0answers
33 views

Power Supply Conversion Pinout Confusion

I'm trying to convert a regular atx pinout to this pinout, but to wire it up I need to know all of the pin definitions for sure, so can yall help answer these questions? The target pinout is one for a ...
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0answers
5 views

Can I use a Revolectrix Power Lab Cell Pro 6 to power XB1?

I had a quick question, wondering if it would be possible to use my Power Lab Cell Pro 6 battery workstation to rig up a power source for a MS Xbox 1? Similar to this question, but different power ...
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1answer
38 views

When do I need separate MLCC (input) and AL-ELEC (bulk) capacitors on my SMPS design?

I've been studying the specification of input capacitance for switching converters. I have a related question here that provides more background. In my research into the topic I came across TI ...
2
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1answer
50 views

Is it useful to think of SMPS input capacitance as part of an LC filter?

I'm at the stage of learning about switched-mode power supplies that I'm focused on understanding the role of input capacitance. Just for background, I'm working with a buck topology for this ...
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2answers
58 views

How much current do I need for a 5050 RGB strip? [on hold]

I want to use 5 meters 5050 RGB Waterproof 300 LED Strip + 20 Key Music IR Remote Controller Sensor. Is it okay if I use a 12V 6A Power Supply?
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2answers
58 views

5v vs 12v dc pcb mounted relay selection

I'm newbie and just got stuck at design decision whether to go for 5 volt dc relay or 12 volt dc relay in power circuit.Both relays equally mentions power dissipation as 170mW according to their ...
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votes
1answer
35 views

Powering project using Moped or Motorbike

I noticed many GPS anti-theft security systems using a kind of Pin for powering them. I want to power a 5v/12v project. Do motorbikes generally have a female or male pin for attaching accessories? ...
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3answers
159 views

What circuit will allow reverse polarity and continue to work?

I am looking for a circuit that will power my device with 12-24v no matter the polarity, the device will use around 1a maximum. I know a bridge rectifier should work but I cannot deal with the ...
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3answers
87 views

Power supply problems

I am building a +/- 45V power supply to drive a master-slave amplifier for a sonoluminescence experiment. I am following a stock design, and am having massive sag problems. The circuit powers up ...
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0answers
45 views

Can I bypass these two adapters?

Scenario I have a LiPo battery connected to a DC > AC inverter and these two adapters (images below) are plugged into the inverter. Hypothesis Everything runs ...
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0answers
25 views

Connecting microcontroller to battery of working mobile phone

Is it safe to use battery of working mobile (ex. Nokia 6310i) through voltage regulator as power supply for MCU? If so, is it safe to charge phone while MCU working?
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0answers
36 views

Why does charging my phone slow/stop midway when not using the national grid like with a mobile power source like a solar cell? [closed]

I recently bought a polycristalline solar cell which is built for charging smartphones, tablets and e-book-readers while camping but I want to use it for normal charging at home too. I tried it ...
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votes
2answers
414 views

Is “catch diode” the correct term to use in SMPS context?

UPDATE: Ok, two good answers, I've chosen the one with more votes as the "right" answer, leaving it to the wisdom of crowds to choose between two fine choices. For anyone who cares, I think I'll ...
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2answers
66 views

Do I need isolation for op-amp stages in a current pump circuit like this?

U3A (OPA703) is used to shift a unipolar DAC signal down to a bipolar signal and feed it to U1 (OPA544). The OPA544 takes this bipolar signal and produce a pretty high current of about 3 Amps at the ...
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votes
0answers
36 views

What type and watts of solar panels are needed for 200Ah/12v deep circle battaries [closed]

I am using 2.5kva inverter with a power bank of four 200AH deep-cycle batteries and am on the electricity grid, but I will be moving off the electricity grid. I am in Southern Africa. What sort of ...
2
votes
2answers
159 views

Why off-line power supplies are called so, like they are “off the line”?

My understanding is that "off the line" means "not on the line". For example an internet user is offline, meaning "not connected". However "Off-line power supplies" are directly connected to the grid (...
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0answers
37 views

Solar power home devices [closed]

Is it possible to build some sort of solar pack that I can charge and then simply modify the kettle, toaster etc and plug them into the solar pack to use? If so how big would the pack need to be and ...
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0answers
70 views

Converting electricity to data bits without hardware [closed]

Can electricity be converted to data bits without using any hardware?
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2answers
93 views

What will happen if I connected 3amps adapter to motor that's need only 2.1amps are that will burning the motor?

I have 3amps power supply and the motor just need 2.1amps so if I connected they together are that will destroying the motor ?
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1answer
47 views

The right gauge wire for a 12v parallel wiring to LEDS and heat sink

enter image description here Hey guys would love your expertise on a project, I'm just a beginner on this stuff. I'm building an LED panel with a total wattage output of about 480W. My question ...
-1
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0answers
36 views

Need help reverse engineering a combined current-voltage feed power supply for an ion beam source [closed]

I'm currently trying to reverse-engineer (or at least make sense) of the arrangement of electronics i utilize on a FIB ion source in the lab i work in. The staff scientist who constructed it left 2 ...
1
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0answers
39 views

Arduino - External Power not working properly [migrated]

I am a newbie to Arduino and created my first project. The project is using a Sharp short range sensor and a 7 seg LED board (http://embedded-lab.com/blog/new-version-of-max7219-based-4-digit-serial-...
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1answer
61 views

Increase Force of a Solenoid

I tried to build a circuit that would allow me to push a washing machine's start button remotely using a solenoid as an actuator. The solenoid is wired to a 9v battery which also powers an ESP8266 ...
0
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1answer
52 views

Parallel external supply to CR2450 coin battery

I have a temperature data logger which should be used within the time period of 1 year as according to the supplier the battery would be drained by this time. The logger has a program stored inside a ...
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2answers
127 views

I fried my multimeter while connecting it to AC

I just bought the multimeter "Multimeter Digital MAS830L" because I wanted to learn about electronics. INSTRUCTION MANUAL HERE. Well, I've read the manual and it said clearly : Alternative ...
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1answer
90 views

Bench Power Supply Project

I got a 750W (12VDC, 62.5A) power supply (I don't have it with me right now so I can't remember the model) from a old server and I was thinking on using it to create a lab bench power supply. My ...
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votes
1answer
98 views

Can 600W PSU work on 1200VA AVR [closed]

This is probably very simple question for everyone on here, but I'm complete newbie when it comes to electronics. Anyway, I'm getting new PC with 600W PSU (my old one had 500W PSU), so I was wondering ...
0
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2answers
107 views

Simplest “battery low” indicator for a 3.7 volt lithium ion battery

I just need a single LED to light up when the voltage drops below a threshold like say 3.3 volt ( sharpness is not that important ). I know basic electronics like transistors,logic gates etc. On ...
1
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2answers
99 views

DC Voltage Supply

new here! And I know just enough to be dangerous! I'm building a toy for my grandchildren that consists of LED lights, switches and knobs, small motors and sound circuits, etc. I used 3V as a spec ...
0
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3answers
86 views

Do capacitors increase voltage?

Just got a (220<-->12-0-12) transformer hooked up with a bridge rectifier and it measured 13 volts DC output from rectifier, but when I added a 1uF capacitor it just jumped up to 20 volts, and same ...
1
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2answers
84 views

wirelessly remote-controlled DC power supply with variable voltage

I need a remote-controlled (wireless) power supply, outputting between 0 and 10 volts and 0 and 2 amps, preferably DC. It should take 110v/120v AC as input. Its voltage should be controllable with a ...
0
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1answer
59 views

How to use supply voltage for a small circuit from a huge variable power supply?

I have a 300 watt solar panel whose voltage and current need to be monitored by installing a device there. There is no source of power supply that I can use for this monitoring device but the solar ...
0
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1answer
82 views

Current limitations of a MOSFET [closed]

I am using IRFZ44N for supplying current to the RGB LED strip. The current that is supplied by the three MOSFETs for the three corresponding colors (R-G-B) is not uniform and much less than required ...
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1answer
54 views

LiPo discharge control

How to control the amount of current I drain from a lipo? U=I*R and I know R but how do I control the values of U and I? If the battery has 1000mAh, 10C and 10 V (I made this up), does the battery ...
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2answers
79 views

is one “bigger” psu more efficient than two small?

I'm going to replace my router and network switch, and question is if both devices comes for example with 5v 1a power supply, is it good idea to buy one 5v 2a power supply and connect both devices? I ...