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

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Can adding power storing capacitors burn up an adapter?

I have been working on a circuit board for an Arduino project. It contains an LCD screen, linear regulators and several relays. In an attempt to remove voltage spikes and dips, I have added several ...
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29 views

Need advice regarding a regulated HV DC power supply for Magnetron

I need a DC 4.2Kv 300ma power supply, and am looking for advice. I'm currently using a the guts of a microwave oven (transformer/diode/capacitor) to power a magnetron for a physics experiment. The ...
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1answer
41 views

Simple Regulated Power Supply

I was trying to make a simple regulated power supply using 4 diodes (0.6v), 2 Resistance, 1 capacitor, 1 transformer (15:1), 1 zener diode. My input is 240v 50hz. I have to get 12V 100mA output so i ...
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1answer
59 views

Common ground between two power supply

I've tried to use a motor driver module(hg7881) with the esp8266. The esp8266 was connected to a 3.3v breadboard power supply and the DC motor with a different one, a 9.6v NiMh battery pack. I've ...
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1answer
33 views

Determining the input voltage range of an adaptor

The label of a power adaptor is damaged so no information if the input voltage is 110V only or 100-240V range. The output is 500mA at 5.5V. I would like to use the adaptor in a 220V country. How ...
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34 views

protect DC power supply from main voltages at outputs

I'm designing a circuit that is hooked up to a 24VDC power supply with a max current rating of 2A. I'm afraid that main voltages (namely 230VAC) may be connected to my circuit by accident. While it ...
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0answers
74 views

How to switch between two 220VAC motor power supplies?

I am not an electrician, electronics engineer or anything that will relate me with your interesting profession, but I am a Project Engineer, Mechanical Engineer, etc. and I am working in my spare time ...
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1answer
37 views

Powering a 4-Pin stock CPU heatsink fan with an external power supply

I have scoured this website and the rest of the internet looking for a solution to my particular issue, but as of yet I have not found an answer. If this is a duplicate question I am sincerely sorry, ...
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27 views

About Battery Balencing

I have one doubt ,i have two Li-ion battery in series and even I'm charging battery's with a charge controller ic ,the doubt is how can i balance my two battery on same voltage with out any ...
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0answers
15 views

Converting power supply to IP67-requirement

My project has the requirement to be at least IP66/IP67-compatible. Furthermore it needs both 5V with high current (20A min.) and 12V (> 15A). Therefore I was thinking about taking a pc power supply, ...
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3answers
47 views

Problem with a solar power bank indicator LEDs

I bought a 10000mAh (actual 4000mAh) solar power bank from Victsing few days ago. After having solved a short-circuit problem that affected the solar panel, I noticed that it took an extremely long ...
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1answer
96 views

Powering 100w 32v LEDs

I need to power many 100w 32-36V LEDs... and building loads of 32V PSUs is costly and time consuming. This is a bit of a crazy idea, and I'm aware that it's probably not the safest way to do this, ...
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1answer
36 views

Charge LiPo 5S with 18.5V laptop power supply

Is it possible to charge 5000mah 5s lipo pack with cheap $10 HP laptop power supply without special LiPo charger? Just by connecting the leads. The charge rate would be less than 1C. Power supply is ...
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1answer
51 views

In the given circuit of a regulated power supply, why is error computed twice, i.e., before and after isolation?

Circuit Operation \$R_4\$ and \$R_5\$ constitute the potential divider which is fed to the error amplifier \$A_1\$. The reference voltage is generated by the Zener diode \$Z_1\$. The error signal is ...
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2answers
101 views

How to measure resistance of resistor in PCB? [on hold]

I have a resistor 1MOhm soldered in a PCB that looks like that And the schematic is looking like that: When I measure the resistance by touching the a multimeter on the two ends of the resistor the ...
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1answer
52 views

Using/hacking an ATX psu - voltage and current

Preface: This is my second attempt in modifying an atx psu for harvesting its high power outputs. I don't have any dummy load as many instructions in the internet have suggested because I think ...
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0answers
25 views

battery augmented power supply

I have a project that requires a 12v power supply. 95% of the time the current draw is only a few amps. As such a pc power supply is sufficient. However occasionally the system requires 200amp for ...
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1answer
47 views

Does a cable exist that would allow me to power a USB device via 2A while also connecting it to a computer for data transfer?

I know that when we charge devices via our computer, it is usually at 500ma (.5A). Does a cable exist that would allow the data transfer to happen to a computer via one USB A connector, but then it ...
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2answers
43 views

Specific Questions Regarding Use of Regulated Switching Supplies

For a project I am working on, I have 3 regulated switching supplies, 5v 5a, 12v 5a, 24v 2a. They are the standard, passively-cooled type which look like this My question: Can I stack these/have them ...
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2answers
664 views

Why is it usually the case that the negative rail for ICs needs more decoupling capacitance (has worse PSRR) than the positive rail?

That the premise in the question seems to hold can be seen from various sources, including: comparing the datasheets of various clones of LM317 and LM337 (too many to list, but generally the ...
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1answer
51 views

Feeding arduino with ATX standby power

I'm designing an Arduino shield to allow the Arduino to control, among other things, an ATX power supply -- I'm running GPIO pins to the PS_ON and P_OK pins of the ATX. I would like to be able to run ...
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0answers
63 views

ATX PSU to variable voltage and current supply (LM317?) [on hold]

Yesterday someone drove by my house and dropped an old pc next to my house. I took it inside and inside of it I found some cool stuff. 2 1gb sticks of ddr ram, radeon hd3850 that I couldn't test ...
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2answers
29 views

How is the resistor value for boost conversion calculated?

I'm looking at MCP1640 and in Section 5.2, an equation for calculating RTOP is presented. However, the two examples underneath have RBOT = 309kOhm. How did that come about? Is 309kOhm some standard ...
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39 views

How to shield an isolated battery powered system?

I'm currently in the process of "designing" (selecting) a DC-DC Converter solution for a battery powered widget that will operate in the desert. It has to comply with various aspects of ...
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60 views

Design Manual for Bumper cars [closed]

I want to study the full engineering of bumper cars (Grid and vehicle), the one used in the entertainment industry for amusement rides. Can any one refer me to any design manual/text book relating to ...
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1answer
39 views

Chassis Grounding a Bipolar Floating Power Supply

I'm building a simple function generator powered from a 24V AC wall adapter. I've rectified the incoming AC to 24V DC using a full wave bridge and an LM317. I intend to split the supply into +/-12V ...
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57 views

Reverse current frying a boost converter?

AFAIK, most boost converters incorporate a diode or some mechanism for ensuring that current flows from the battery to the output. For instance, TPS61030's datasheet says that This device however ...
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0answers
91 views

why do we need grounding in inverter?

i am doing simulation for 120 dg, 3 ph BLDC motor while testing the inverter with R load the wave forms are not proper (positive square wave),but if i connect ground either(supply or neutral) ...
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2answers
47 views

Adjustable power supply simulator/reality

Hi im a student of computer engineering and im currently doing a project of a adjustable power supply it should be doing 0-30V but im getting some problems with the word adjustable haha,i got this ...
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1answer
53 views

AC power cord different on a laptop and a desktop, other appliances

If I look at the power cord plugged from the wall socket to desktop computers, monitors, etc. at the office, it looks like (North America): Now, if I look at the power cord plugged into my laptop's ...
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1answer
52 views

How the amperage of power source is computed?

Almost all power sources have the amperage written on them. How does the amperage of the power source is computed?
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1answer
55 views

Powering multiple devices from a single supply with 48V

First of all I asked this question in DIY.stackexchange.com, because of the cabling in the house. Here I would like to ask about the electronics (or electrical) part of it. And there is a very ...
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30 views

How to detect ripple in a specific frequency range on a power rail?

I'm struggling with a circuit that should monitor the ripple between 1000 Hz and 4000 Hz of a power rail (48 V). It must be able to detect if the peak to mean ripple is larger than 2 V. My first ...
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0answers
11 views

OLED segment voltage reference pin

what is the purpose of a segment voltage reference pin in general or particularly in a OLED display controller SSD1322. The datasheet says: When external VSL is used, connect with resistor and ...
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1answer
59 views

Using capacitors to supply peak current

I hope this thread is allowed. Based upon my previous topic, which turned out to be the exact opposite of what I needed to accomplish, I have a few questions. I have a 240W 24V Supply: ...
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1answer
22 views

Powering an External Phone Ringer - Straight Talk Home Service

My dad is having difficulty hearing his cordless phone ring in his shop, due to ambient noise. He has the phone connected to a Straight Talk home phone service device. So, there is no legacy analog ...
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2answers
63 views

Battery gauge – Microcontroller 3.3V using a 4.8V NiMh battery source

Well I am currently working on building a battery gauge via LED. My target is a red LED to blink if batteries are going to die and a green LED to blink if the batteries are fine. Researching on ...
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3answers
101 views

How to determine the maximum power required by given devices? [closed]

I need to power 4 devices with these power input specs: ...
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1answer
76 views

Three questions about the use of a transformer in switching power-supply

In this document (an introduction to switching power supplies) a boost-mode switching power supply is presented: it has a simple inductor, diode, capacitor and load. Then (page 9) it is specified that ...
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0answers
31 views

Test a ssd1322 based display

What's up folks? I have a problem with one OLED display based on the ssd1322 controller. The DD-25664GE-1A is a 5.5 inches display for which I made a custom PCB connecting the controller to a ...
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2answers
71 views

I2C Bus is Not Responsive When Engine Is Running. How to Diagnose and Fix?

I've got a solder-less bread-boarded prototype microcontroller with a few I2C devices that take some measurements on a motorcycle. For now, The MCU is powered by a LM7805 with decoupling caps near the ...
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2answers
49 views

DC Supply Load Dummy based on NPNs

I am fixing an old regulated load dummy that I use in my workspace. It was a mess and I want to modify its regulator side. My question is: will the circuit showed in the image work properly? If you ...
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1answer
59 views

High voltage AC-AC or DC-DC buck conversion

I have a schematic for an amplifier which if supplied a lower voltage will still work as a low-wattage amplifier. In the original circuit this is achieved using a 3-tap transformer: I would like to ...
2
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1answer
298 views

Whats the overrall power available from two PSUs in series?

Consider this circuit: PSU 1 is rated at 100w, PSU 2 is rated at 200w. How do I calculate how much power is available to the load, given the mis-matched power supplies?
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1answer
48 views

Power supply switching - Ground connection

I am designing a system that has 2 power inputs and has to be working as long as these power supplies are fine. I mean, the system starts working with power supply #1 but if it fails, switches to ...
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2answers
63 views

what battery(s) do i need to power a 12 amp 200 mph motor for 1 hour?

I have a plug in leaf blower/vacuum and would like to convert it to battery power. here is a link to the equipment in question. ...
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2answers
52 views

Powering a ESP8266 and an auxiliar device using a single power source

I am trying to connect two components to the same 12V/1000mA DC power source. The devices are 300mA/9V (D1, auxiliar device) and 500mA/3.3V (D2, ESP8266) respectively. See the diagram below: ...
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2answers
107 views

Is there a way to buffer current for high usage periods?

I am using a USB port as a power source(500-1000ma) for my latest design(Wireless Comms and lots of LED's) and most of the time things work perfectly. However at times I do get spikes where the ...
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3answers
85 views

Suppressing contactor coil inrush, is this possible?

http://www.kvc.com.my/EnterpriseChannel/SharedResources/Datasheet/0/?ProductId=1000066755&Filename=SCHNEIDER-LX4-FH024.pdf I am trying to operate a 24VDC coil with an inrush of approximately 30A, ...
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3answers
99 views

Can I combine 3x 1000ma power supplies (wall warts) to get a 3amp supply [answer: no]

I have a device that requires 3amps 9v. I also have 3 1000ma power supplies (wall warts.) Can I cut the wires of these power supplies, reconnect them all together in parallel, and use them all as a ...