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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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133 views

Multiple Step-Down Voltage Rails from a single DC Power Supply

I have one working PCB which has three different Voltage Rails: 3.3V, 4V and ...
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1answer
74 views

Flyback discontinuous mode, double voltage over the switch

Considering the following simplified flyback schematic. Which has the following voltage current graphs Why is there 2*Vin over the switch when the switch is turned off? And why is that change to Vin ...
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1answer
45 views

What fuse to select for a 240W power supply

I have a 12Volt 20Amp 240Watt regulated power supply to use for a table top pinball game - comprising of solenoids (2@ 12V 8A peak), some LEDs and a micro controller. The unit has an internal fuse but ...
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46 views

What factors should I consider when choosing a high amperage power supply?

I've searched around, but I haven't found an answer to this particular question yet. I'm building an elecromechanical project which requires somewhere around 60 Amps at 12 Volts. While this may not ...
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1answer
46 views

Is there a PCB coplanar edge connector made for high power transmission instead of data transmission? [closed]

Looking for a PCB-to-PCB coplanar edge connector that can carry ideally 40V and 30A.
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1answer
72 views

220/240 to 200v dc power supply

I have a 12kva (10kw) ups and I want to power it from a 24v battery bank. The dc input is 192dc input from the battery side. I was thinking off getting a 24 to 220 Inverter and rectifing it to output ...
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3answers
194 views

Voltage buffer in power supply

The output voltage from the NPN transistor (TIP142) is 4.7 volts with no load attached and only decreases as the load increases. However, voltage at its base (from an LM7805) remains a stable 5V. How ...
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2answers
71 views

What am I doing wrong? COB LED with LED Driver

I am relatively new to electronics and I am trying to turn on a Bridgelux BXRC-50C2001-D-74COB LED (Digikey listing, Datasheet ) using a 500mA Mean Well DC-DC LED Driver (LDD-500LW). The LED Driver is ...
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1answer
32 views

Powering Pi Zero + Arduino Micro for brief interruption in supply

I have this toy I am making for my toddler that includes Arduino Micro and Raspberry Pi Zero (plus 10 APA-102 RGB LEDs and audio amplifier that feeds a 3W speaker. This all is powered through a 5V ...
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1answer
69 views

Switching Mode Power Supply Fluctuating Output

I designed a switching mode power supply using LNK-562, I share the circuit schematic below. Note that NTC, fuse, and the input filter inductor is replaced with shorts in the real circuits. I am ...
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1answer
62 views

5v 10amp powering arduino and LED strip

I need my 5v 10 amp power supply to power both my LED strip and arduino. I will have the LED strip directly wired to the power supply, then for the arduino I have two ideas - either cut a USB cable ...
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1answer
73 views

Ampere requirements [duplicate]

I read question from someone who was having monitor with 90 W power, 19 V and 3.32 A rating. When calculated using volt and power the amp came out to be 4.74 A. I didn't understand why is there ...
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2answers
138 views

What device can convert (EEG) voltage data to real voltage? [closed]

I seek a device that can be programmed to output physical voltages based on a set of datapoints. For example: ...
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1answer
58 views

9V Battery Current Range

What is the range of currents that I can safely draw out of a 9V battery without damaging it? I am planning to design an experiment and I don't want to draw too much of current out of a battery and ...
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2answers
88 views

How to Convert 28V to 12V?

I have to use a 28V DC power supply for a certain design I am doing. But I only need 12V DC to power up this device. How would I design this in a schematic? What would I need? I have been searching up ...
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3answers
94 views

Crowbar Circuit Resistor

I have a crowbar circuit which uses an SCR with 100mA gate current shown below. In order to use this resistor value at 100mA it would need to be rated for 60W. Obviously here the resistor will pop. ...
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2answers
122 views

Bus-powered non-USB device (like fan,lamp) USB pin arrangement to getting highest power from USB host

Bus powered means device that only use Vbus of USB for it's power supply. I want to use micro USB as my board power supply. The is designed to take 600mA by 3.3v regulator. But I just don't know how ...
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0answers
29 views

Run Bldc motor and controller with DC-DC boost converter.

Is it possible to run 1000w BLDC motor and controller with DC to DC boost converter. Motor controller requires 50amps and 48v current. Can i use 24 volts and boost converter to boost voltage to 48 ...
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1answer
85 views

Power transformer question in vacuum tube circuit

I am having trouble wrapping my brain around this power transformer circuit. I must be missing something very fundamental, so I apologize in advance for that. Can someone explain to me why the center ...
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1answer
65 views

Calculating the ripple voltage from a standard wall adapter power supply

I've come across a formula for calculating the ripple voltage from a wall adapter AC to DC power supply, which uses a step down transformer, fed to a rectifier, with the rectifier output connected to ...
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1answer
39 views

Chain lithium battery charging board and DC-DC voltage step-up

First I am sorry if it is a duplicate of https://electronics.stackexchange.com/a/151157/207677 I have this two cards: 1 A LITHIUM BATTERY CHARGING BOARD LM2577 DC-DC VOLTAGE STEP-UP (BOOST) MODULE ...
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0answers
23 views

Designing a CCM Boost PFC rectifier circuit

I am working on designing a CCM Boost PFC rectifier circuit, supplying up to 2.8kW at 400Vdc nominal, while taking 230Vac, 50Hz controlled via negative feedback in the average current control mode. I ...
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1answer
69 views

Arduino and 3W LED sharing the same power source, is it possible and how?

I've built a remote control for my 3W power LED with an Arduino UNO and I'm powering the Arduino with a USB cable and the LED with 4x AA NiMh batteries (1.2V). Is it possible to power both my Arduino ...
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1answer
33 views

If I use a 5A power pack for 3 led strips 2A will the power pack burn [duplicate]

I'm trying to make a light and I'm using 2A 12v aluminium led strip lights. But I need to know how to select the power supply for this. I'm using 8 led strips: 4 strips 2.5 feet 4 strips 1.5 feet ...
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1answer
76 views

How to connect the power planes of 2 PCBs with the least stray inductance?

By the nature of my project, I am designing 2 power electronic boards that are supposed to have its high power main voltage and ground plane connected together. Can you recommend a type of connector ...
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2answers
52 views

How is load forecasting profitable to power companies

Let's suppose that a power company is using a software model 'X' to do load forecasting which can predict 24 hour ahead load with a MAPE of 5%. Now suppose that I've created a model 'Y' that reduces ...
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1answer
112 views

How does this power supply schematic work? [closed]

The above is the schematic for the power supply portion of a board. As a electronics noob, I find it highly confusing and hence would appreciate some help in unraveling this schematic. The EE13 ...
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2answers
162 views

In SMPS , why does peak current mode control have lower gain for inner loop compared to average current mode control?

This has been bothering me for a while. In some of the design notes of power management ICs , it is mentioned that peak current mode control has 'lower gain - wider bandwidth' inner loop compared ...
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3answers
91 views

Capacitor max safe operating voltage

I'm currently making a power supply with a 32 volt AC out, so the rectified voltage would be 32*1.414-diode drop. The value comes around 44 volts. My question is, is it okay to hook up a 50 V rated ...
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0answers
84 views

Solar Charge Controller with SMPS Power Supply

Hi, I want to charge a 2-Cell Li-ion battery (7.4 V) using CN3722 Solar Charge controller and a SMPS power supply (instead of using solar supply). I have designed my circuit to charge with maximum 1A ...
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1answer
51 views

can I use Two Same Power supply sharing input in single circuit?

I currently have a circuit which consists of two different boards. In the main board, there is a \$230\,\mathrm{V}\$ ac supply, a \$230\,\mathrm{V}\$ to \$12\,\mathrm{V}\$ dc power supply, a 7805 ...
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0answers
40 views

Designing a +10 V -10 V +7 V DC power supply for audio equipment

I've recently purchased a tape recorder (Tascam Midistudio 644) that was very cheap because the previous owner had lost the power supply. The PS-M1 power supply that originally came with this unit is ...
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1answer
46 views

12Vdc to 5Vdc @ 3A circuit

i'm trying to construct the following dc to dc converter. Input: 12Vdc 3A output: 5Vdc 3A but i'm getting no output, any ideas ?
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1answer
54 views

9V instead of 3.7V 8.14WH

I have a solar charger which has a battery of 3.7V 8.14WH which is rechargeable. The battery was rechargeable but died. The charger wasn't working with the battery inside it, so I removed the battery ...
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1answer
63 views

Trusted and small price 220 to 5V

How do you choose your 220V to 5V components? For example, should I trust one like this that it doesn't heat too much or that it doesn't catch fire? The component needs to be relatively small priced ...
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1answer
48 views

PWM as a voltage regulator for 12V wiper motors and 14.8V LiPo

I'm using 12V (~40W) car wipers motors for small robotic project. Motors are driven over MOSFET H-bridge (IRF1405/IRF4905) with PWM speed/power regulation. Currently a voltage source for motors is a ...
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0answers
25 views

Help debugging problem in light meter power supply

I have an old Sekonic light meter (L-778) that was reporting no battery when batteries were installed, and emitted a high-pitched whine that changed in pitch when powered on and off with the battery ...
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1answer
70 views

What's the magic behind inverters? [closed]

I'm having hard time understanding how inverter works and why it works. I mean why is it possible to power a say fridge (220V AC) with a 5v battery using a 5v to 220v inverter ? And since this is ...
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1answer
55 views

Sticking to high voltage DC Current

I heard that if you come into contact with a high voltage DC current, you will ‘stick’ to it until it is switched off. Why is this and how high does the voltage have to be for someone to ‘stick’ to it?...
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1answer
53 views

Ringing issue on I2C FM+ bus between MCU and few sensors - Power supply issue?

I'm experiencing some issues while probing a problematic I2C bus on the oscilloscope. We want to interface several TLV493D-A1B6, with a STM32L4 (we are working as well on STM32F4 and have the same ...
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1answer
47 views

Multimeter across Power Line voltage varies wildly

I'm building a single switched AC/DC Forward Converter and have reached to the point where I have steady o/p voltages and currents. However, I am not able to remove noise that goes back into the AC ...
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2answers
84 views

How to tell if a capacitor is still good?

I was replacing a 400v 120uf capacitor in a power supply (ac 120v-19v DC 4.62 amps) well I was a dumb ass and stuck in backwards somehow. I tested the dc out end while it was still plugged in and ...
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1answer
58 views

2 Coil Latching Relay Setup

I am trying to use a relay to power a RPi for the first time and just confused by how I should wire it. I am trying to control the relay with a ATtiny10 MCU (microcontroller) if that helps in ...
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1answer
129 views

Choosing a suitable power supply for a MOSFET driver chip

I would like to use the TC4427 MOSFET driver chip, in order to switch the current through the IGBT AUIRG4PH50S, which will be placed in series with a resistive load. The power supply providing the ...
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2answers
64 views

Query: why a 4-pin DIN plug on a 5 VDC 10 A supply?

My new 5 VDC 50 W PSU has a 4-pin DIN output plug. The output diagram on the PSU lists two pins as (-), and two as (+). The voltage between any +/- pair is identical (5.13 V), so why the need for two ...
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1answer
60 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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1answer
53 views

a variable dc power supply with V and I vary independently [closed]

checked some variable dc power supply, there is a common problem that when V vary, I following vary, vice versa。 Are there any project overcome this?
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3answers
65 views

Reverse Diode and Resistor in parallel for battery connection. What do they do?

Can you please help me understand what the diode and resistor connected to the battery input line of this circuit are doing? Thank you!
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1answer
41 views

Specifying parts for Induction Heater; how to determine current requirements at transformer? [closed]

I'm working on specifying parts for the following circuit: I intend to have a very large work coil, (like 12" diameter) so I'm expecting to need a lot of power. I'm on a tight budget, though, so ...
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1answer
78 views

Capacitance multiplier for synth psu…?

Noob alert. I'm about to build a pretty simple PSU for my modular synth project. I'm looking at a few schematics from popular sites and I've previously built a simple wall-wart one based on this from ...