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
79 views

Zener Diode in Parallel with a Resistor which in turn is parallel to a Capacitor [on hold]

I'm not sure I understand the purpose of a resistor in parallel to a capacitor and then in addition a zener. Initially, I thought it was a voltage regulator but there's no resistor between power ...
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1answer
59 views

Is it possible to use an LDO as an Auxiliary source to a smps?

My SMPS controller can supply about 250mA and 3.3V output. There are rare but crucial moments when power demand goes above 250mA, voltage sags below 2.7V, and the MCU brown-out occurs. The ...
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0answers
85 views

Massive pk-pk ripple on output using isolated DC-DC converter module

I'm having a very odd issue using an integrated DC-DC isolated converter module. As the module stabilizes, a massive pk-pk ripple is developing on both the output and the input. At first we thought ...
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2answers
65 views

How to power 2 15.2v 57.2 watts peltier plates [closed]

I am building a custom peltier cooler out of aluminum insulated with styrofoam I currently have 2 tec-12706 peltier plates and 2 PC fans what would be a adequate power supply for this setup?
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5answers
81 views

Size a power supply for a DC motor?

I'm wondering how to size a power supply for DC motors. I have a 70W 24V brushed DC motor [Linix 63zy24-70-A I picked up from a surplus store]. I intend to control this using a PWM/MOSFET. If 10 ...
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1answer
38 views

By pass diode in PV cells

hope you all are well The bypass diode is usually connected in parallel with PV cell to avoid hot spot and prevent more PV output power losses. The bypass diode is connected in opposite direction to ...
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1answer
49 views

TNY264 - hisses when isn't load significantly

Recently I designed a power supply based on TNY264 datasheet schematic and tested it. It works perfectly but at small loads the TNY generates a loud hissing sound. Only after load of about 100-...
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2answers
49 views

How do chargers with different output values work?

I have a few USB-C devices with their own chargers and I'm not sure if I can interchange them. What's confusing me is the different output values listed on the charger. From what I understand too high ...
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3answers
877 views

Converting 8V AC to 8V DC - bridge rectifier gets very hot while idling

I am tinkering with an Arduino and recently had to convert 8V AC to 5V DC in order to run it. The project is a custom doorbell, which gets the power from the doorbell transformer (transformer is ...
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2answers
99 views

Replace mains 12v power-supply with 12v battery

A Yamaha digital piano is powered by a mains power-supply. The power-supply states the following input/output values: INPUT 100-240V~50/60Hz 0.5A OUTPUT 12V === 1.5A (Where I have written === there ...
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2answers
46 views

Output current capability of LDO

If an LDO generates 3.3V/300mA output voltage and current, what is the input current of the LDO? Must I give more than 300mA current at the input?
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36 views

Should an old IBM PC AT power supply only function while loaded? [migrated]

I was just given an old (from what I can tell) IBM AT power supply. It's pre-ATX and has a physical switch that connects the wall power to the internal circuitry. Output is: 12 V  8 A 5 V  ...
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1answer
95 views

Voltage regulator getting extremely hot

I've built a LED PWM controller according to the below schematic and the voltage regulator is getting extremely hot (I can't touch the heatsink). I've measured input and output voltages and currents ...
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1answer
77 views

Building a circuit to replicate a LiPo battery

We want to keep a Xiaomi Mix smartphone powered on for a very long time (>6 months) with power from the USB cable. This is not recommended by the manufacturer since the battery will be constantly at ...
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1answer
72 views

What would be the difference between the output of a power bank and a laptop usb port? [closed]

I have an encoder which I have been successfully using when powered from my a USB2.0 outlet on my laptop. I need to be able to run it whilst disconnected from the laptop and so tried powering it from ...
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1answer
31 views

BQ2057WSN Charging current issue

Today when I was going to measure charging current in BQ2057WSN charging circuit (Input Supply: 12VDC, Battery: 7.4V,6600mAH) by putting a multi meter in series with Q1 (shown in figure) and measured ...
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3answers
170 views

How do i remove this power supply noise?

Above is the circuit diagram of my power supply. it converts input 12V DC into 5V DC and then 3.3V DC with linear regulator. i have highlighted it in red color in the block diagram. So current ...
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0answers
29 views

Power management controller with multiple inputs

I have planned a (quite complex) controller for a project based on a Raspberry Pi (web UI, logging, camera framegrabbing/video processing, LTE uplink), i2c sensors (assortment of environment sensors), ...
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0answers
34 views

BQ2057WSN Circuit Heating issue

We are using BQ2057WSN charging IC to charge a 7.4V, 6600mAh Li-Ion Battery by providing 12VDC,2A power supply. According to my calculation the charging current is set at 625mA. But while charging, ...
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2answers
42 views

BQ2057WSN Charging issues

I have designed a battery charging Module using BQ2057WSN IC to charge a 7.4V,6600mAH Li-ion battery. According to my calculation the charging current is set at 625mA. The input power source to the ...
0
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1answer
28 views

Specs for an AC Power Bank as an Outlet Replacement

I've been seeing cheaper and cheaper power banks on Amazon, and have even started to see them in hardware stores. My impression is that most people will use them to tailgate or to power batter pack ...
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1answer
65 views

Is it possible using two 3.3v LDOs from one SMPS AC-DC 5V to power 2 MCUs?

I'm planning to use two 3.3V LDOs to supply power for two MCUs, one is STM32, one is ESP-12. Input power of these two LDOs come from one SMPS module 5V, 3W (HLK-PM01). The reason for two seperate LDOs:...
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1answer
25 views

Advice on power section circuit

I'm designing a power section for my guitar pedal circuit that will supply power to my pedal using either a 9V power supply or a 9V battery. I'm using a switched barrel jack but I'm not sure if I have ...
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2answers
86 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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0answers
40 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
75 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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1answer
81 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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3answers
83 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
241 views

16 A appliance into 30 A outlet [closed]

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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0answers
35 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
30 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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1answer
36 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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2answers
66 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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1answer
38 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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0answers
43 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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0answers
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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1answer
44 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
71 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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1answer
148 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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0answers
33 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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1answer
79 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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0answers
55 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
56 views

How to use a pressure sensor (transducer)? [closed]

I have this pair of pressure sensors that are addressable transducers. I want to use them for a project but I don´t really get how to get them to work. I´m used to the type of sensor that has 3 cables(...
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1answer
106 views

Switching Power Supply Chirping, How to Fix? [closed]

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
76 views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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0answers
44 views

Draw 15V from USB C Power Delivery devices

I need to draw 15V from USB C PD capable devices such as power banks or chargers. So I need a rather small tool or build for this I can draw about 15V 3A via usb c with. Thanks for your help.
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1answer
69 views

Solar power to USB C PD

I want to convert direct sunlight energy into usb c pd. USB C Pd then will be used to charge a powerbank. The bank can be charged via USB C. The actual solar panel is this: https://www.amazon.de/...
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0answers
45 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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2answers
49 views

Proper voltages from same source

I'm building a small electromobile. I was planning on using a car alternator as the motor, however I'm now looking into buying a 48V 500W BLDC motor. The problem is I'm not really sure how to manage ...
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0answers
48 views

How to decouple the grounds for two different switching regulators?

I've a single DC 24V battery supply, which I use as the input for generating separate 12V and 5V supplies. Two separate LM2576T ICs are used to regulate the voltage to the lower levels. However, the ...