Questions tagged [power-supply]

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

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1answer
32 views

How to power up a project with 3 devices, between 0 and 12 volts

I'm working on a project which involves a DC heating element, a computer fan and an Arduino/ESP8266. I'd like to use one power supply for those devices..... The requirements: The heater needs a ...
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18 views

DIY USB Power Hub

I'm looking to see if assembling my own USB hub is an option. I need to charge 20 devices via Micro USB at once. Data transfer is not needed. Is anything stopping me from getting a 5V 20A power ...
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22 views

Dual supply source, how to do the switching?

I'm designing a circuit that I'd like to normally power from a 12-36VDC source, but want to have the option of also powering it via the USB connection during configuration. I've chosen the LMR16030 ...
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1answer
24 views

WRL-1368 (ESP8266) wifi module briefly flashes blue LED once when powered up, then nothing happens

I bought a WRL-13678 wifi module, but when I connect it to a 3.3V power source, the blue LED flashes once, then nothing happens. I tried powering it from a 3.3V breadboard power supply (connected to ...
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3answers
69 views

How to make linear actuators go in both directions? (Using arduino/microcontroller)

I'm stuck here, I want to make the lineal actuators to go up and down, both of the actuators move to the same direction at the same time. The arduino receives a signal as input and then the ouptut ...
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4answers
170 views

16 A appliance into 30 A outlet

I am hoping someone with electrical system knowledge can help clear something up for me. I am considering purchasing an appliance the requires a 230V, 16A outlet. I asked an electrician about wiring ...
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1answer
43 views

Multiple Power Supplies Powering Long LED Strip - Proper Way to Ground

Please refer to the above diagram. The 2 power supplies are each placed in the opposite end of the led strip. I will be connecting the signal ground and the power ground just before it connects to ...
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20 views

Repair Sound Device Mix Pre 6 battery sled [on hold]

I am using a audio recording device SOUNDEVICES Mix Pre 6 with several powering options. One of them is a battery sled, the MX L Mount for the famous SONY FP970 battery. The adapter can hold 2 and ...
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59 views

Induction Motor With Batteries [on hold]

Recommend me an electric motor which should be run up-to 4 - 6 hours with batteries. I had mentioned the batteries details below which i got. I think mostly induction motor are used in electric cars ...
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122 views

3.3V LDO Selection

If you've ever tried to find an appropriate LDO for your project you may have noticed the incredibly vast range available on the market. During my searches, I discovered this particular regulator ...
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2answers
110 views

Any downside to feeding a buck regulator into a linear one?

I need to convert 12 V down to 5 V and 3.3 V. I am using linear regulators right now but they get pretty warm and eventually I would like to supply more current for it (around 500-700&...
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2answers
49 views

How to easily power multiple components with differing requirements?

I'm a long-term software developer who hasn't touched a soldering iron since Uni. I've been mulling an idea for a hardware project for some time, and have cajoled a raspberry pi into managing the ...
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31 views

Thermistor in power supplies

a thermistor is commonly used in power supplies to limit inrush current. But once the thermistor is heated up the resistance is ideally 0ohms. If i switch the power supply on and off rapidly there ...
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1answer
27 views

Need help with terminology so that I can source a din rail version of this part

Im looking for a 12 VDC power supply that has the ability to switch to a battery when ac power is lost in addition to having some type of AC status function such as an open collector. This part does ...
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2answers
141 views

Battery failing. Oscilloscope?

The question is - is there an inexpensive oscilloscope I can use to measure DC voltage and current to see why my battery pack is failing to power a DSLR? In order to take long time lapse photos with ...
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3answers
68 views

Simpler ways to develop a buck regulator

I am designing a low profile space grade buck regulator. I have the following constraints ICs must be space grade Low component count Small size The converter specifications are as follows. Input ...
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25 views

Variable Frequency Variable Amplitude PSU [on hold]

I’m looking for an adjustable power supply that takes 220V 60Hz AC and produces an adjustable RF power line (10MHz range) with amplitudes up to 500V. Where can I find these? I need something ...
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1answer
33 views

Battery configuration for inverter?

I have a PC with a 280 W PSU. I am thinking about buying an inverter but I am confused. I have an inverter which requires 36 VDC. Will it work if I add 3 12 V, 50 Ah batteries in series? Or shall ...
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1answer
33 views

TEC2-25408 - 8A 12 V - goes max at -20° 4A

I have tried to power that pelletier module with an AT power supply but I reached max -10°C or something I ordered a 12V 10A power supply, as I measure the peltier module, it really does not go up to ...
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1answer
240 views

DIY ATX PSU turns off when attaching load on 12V rail

I want to convert my old ATX power supply to a simple bench supply for 12V devices. On the label it says it's a 300W PSU where I can use 264W on the 12V rail (see image below). https://imgur.com/...
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216 views

Whats the difference between a battery charger & Transformer to power a 12 V 3 A bilge pump?

I made a common mistake, identical to an earlier post "Using a 12 V 3 A bilge pump on a 12 V 8.5 A LED power supply". The pump was 3.8 amp so I purchased a 5amp led transformer, which just worked, ...
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38 views

Use Triac as SMPS to get DC voltage

I want n 12V 1A supply for a project. I want a transformer-less topology. I was reading and experimenting with readily available traic based dimmers. They use phase control to cut the input voltage ...
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9 views

Why do type 2 SPD’s* require overcurrent protection (*load side, mains, Surge Protection Devices) [migrated]

Bought a house built in the 1970’s in a 1970’s neighborhood. It has a 200AMP main panel. A serviceman replacing 1 of the 2 mainboards in the refrigerator suggested that I install an SPD inline in each ...
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3answers
373 views

Mixed analog-digital power supply

I'd like to build a project where I'm essentially controlling analog signal generation in the audio range from a microcontroller. In other words, an analog synth with digital control. I'm at the stage ...
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1answer
129 views

LED Video Wall Power Supply

I am working on an LED panel video wall project made up of 3x8 squares of 128x128 pixel panels. Each panel has a worst case power draw of 65W and typical of 35W. I can get the panels as either 24V ...
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1answer
61 views

Removing output voltage ripple in high voltage outputs

I am looking to reduce the voltage ripple on a DC/DC converter operating at 5kV. I have looked extensively on the internet and have found multiple ways to reduce output voltage ripple, an ...
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1answer
85 views

How to limit current while almost keeping voltage same

I am supposed to design a power supply to a project. I have 3 alternative power supply designs for this purpose. However, one of them sucks huge current while giving enough current. My design is given ...
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42 views

Questions regarding Gallium Nitride semiconductor devices in Switched Mode Power Supplies

I have a couple of questions regarding the use of Gallium Nitride MOSFET devices in a DC/DC converter design of mine. My topology is an LCC full bridge converter. My knowledge is not at expert level ...
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27 views

High Voltage Active Rectification using Silicon Carbide MOSFET

This is a purely theoretical question, please forgive me if I am being stupid. Synchronous rectification and secondary side control of DC/DC converters is very commonplace in low voltage, high ...
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4answers
11k views

How many SMD 5630 LEDs can I power with 12V 1A power supply?

I am new to this and have what is probably a newbie question. I am using SMD 5630 LEDs from a strip that I am cutting off and wiring each LED individually. They will be wired in parallel and I am ...
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42 views

Power bank port detection [closed]

I bought some power banks, I took all the pieces apart in order to set them in a most resistance case, the matter is than before I opened the original case it was powering my arduino at the moment I ...
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1answer
93 views

Switch between 2 power supply feeds without device losing power

I have done a search on here but didn't find the answer (maybe "woods for the trees") but here goes... A brief 'background' -- In my house, there's a switch by my front door that turns on/off the ...
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39 views

Suggestions Sought for a High Power, Low-Ripple Negative Power Supply [closed]

I have an old spectrometer that requires +-12V and +-5V power sources. I have everything but the -5V, 1A. So I am thinking of using one of those +12V or +5V to generate the -5V. The modules I found ...
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55 views

Power Supply of a VCR [closed]

My VCR was not working, I wanted to restore it. I don't have enough knowledge about circuit components. Can you tell what it that white round colour thing in the picture?
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2answers
87 views

Problem in IR2112 use

What is wrong in this connection diagram. I had provided pwm with 20kHz and 5volts. But at the R3 I am not getting results
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37 views

Help me to fix 12V 1A SMPS power supply [closed]

I am new to electronics. I am trying to build an SMPS power supply - output 12V 1A. I got the reference design from online. The DC output from the flyback transformer is 30V+ but I am trying to ...
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3answers
138 views

Three Different Voltage Lines, Same Common Ground?

I am trying to send PWM, clock, latch and blank signals from Arduino through a series (16) of TLC5940 Breakout boards and on to a grid of 512 individual controlled LEDs six feet away (RJ45). I am ...
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1answer
155 views

Integrated 5V uninterruptible power supply (UPS) with a lithium cell?

I'm trying to figure out the best way to implement a UPS for an embedded system that runs from a 5V supply. Essentially the system has a 48v to 5v, 1.2A output DCDC converter that powers my system. ...
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1answer
515 views

SMPS Transformer - Secondary voltage rating

I am designing isolated flyback converter with input voltage range 40VDC-110VDC, 5V/6A output. I am struggling with finding appropriate transformer since each and every one I found have lower primary ...
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1answer
131 views

Using a 120W inverter with a 180W brick

For some testing at my company, we attach the product to a small plane and collect data with a laptop. The product itself is run off a small motorcycle battery and, last time we flew, our laptop ...
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53 views

Implementing a power supply for my project

I looking for advice on the best way to implement a power supply for my project. There are three elements to the project: a piezo mixer / preamp requiring a bipolar +9 / -9V supply (schematic ...
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1answer
204 views

Designing an effective power supply for embedded products

I'm currently designing several embedded microcontroller products to be powered from a wall outlet. I plan to use wall-wart power supplies to give an input of approximately 5-9V DC but I want the ...
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2answers
131 views

Maximum voltage and current input of this circuit?

I am looking to assemble a power supply with an output of roughly 600 watts. One of the components required for such an apparatus is a 40 kVDC, 20 mA flyback transformer that I managed to find and ...
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1answer
49 views

Isolated UART communication: Which side should send the supply for the isolator?

I am in a situation to establish an isolated UART communication between two separate PCBs. The first PCB regulates and sends the required isolated power of the second one. The UART communication will ...
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1answer
101 views

Power Supply wiring check

I'm not too confident with electronics and I'm currently working on a project where I need a 12V mains power supply. I got a switch for it and have wired it. I've shown pictures. Is this wiring ...
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1answer
108 views

Powering a low voltage device from a two wire light circuit

I am about to embark on a home automation project, but I'm having trouble finding Wifi based IoT devices which can be powered from a standard two wire light circuit. The idea is to replace light ...
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4answers
2k views

Homebrew Redundant PC Power Supplies

I'd like to have redundant power supplies to power an array of four hard drives. Each drive uses 5V at .6A (3W) and 12V at .45A (5.4W), for a total of less than 10W each. The four drives will have ...
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1answer
94 views

Switching Power Supply Chirping, How to Fix?

I have a Dedicated Micros UP07223010 power supply that gives out a chirping noise. A voltmeter attached to the terminals shows a swing for each chirp. A few days ago, my HP laptop power supply ...
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1answer
138 views
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1answer
116 views

Transimpedance Amplifiers on PCB

I have several transimpedance amplifiers on my board, and I want to avoid the need for a negative power supply, but I can't see any way around it (except for running the current through a resistor but ...