Questions tagged [power-supply]
An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.
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Check of PDN for RF Amplifier - Revised
This is an update to my previous post. I was recommended to post it again.
For optimal working conditions, HMC863ALC4TR needs Vdd = 5.5 V and Vgg = -0.75 V. I have tried to design such a network to ...
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What connectors do these power supplies use?
I found a few power supplies which I need for my projects. The only problem is connecting them, I have a few sockets, which are unknown to me. I can disassemble PS of course and replace sockets yet it ...
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Fusible resistor blowing on flyback converter
I have a flyback converter circuit with AC input, and I have a fusible resistor on the hot line before the rectifier. When I hook up AC power to the input, the fusible resistor immediately blows. It ...
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Easiest way to Regulating 12V-16V to 12V?
I want to power the circuit with 4 lithium-ion batteries, 3.7V each. In total, they should supply 12V to 16.8V, I would like to power a motor with this power supply, the motor driver needs 9-12V. What ...
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What is an efficient way for distributing equal power to multiple audio amps?
I'm working on an audio system prototype that requires cables passing through active speakers in series. As cables will have different lengths, I'm counting on voltage drops along the way. Is there an ...
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What type of 3-pin connector is this?
Attached is an image of the connector to my desk lamp. I can't tell what type of connector it is. It's 3-pin but the far left hole doesn't appear to be used. The connector is attached to my desk lamp.
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BJT voltage rail
I have run into some misunderstandings regarding voltage rails in circuits with components such as BJTs. And not the BJTs, but rather the conventional current model schematic made, and the real thing, ...
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Power supply switch PS-ON with bus signal
I have a power supply (PSU) (not standard computer ATX PSU)
PSU EPP-300 is at https://www.meanwell.com/productPdf.aspx?i=715
with function connector:
5VSB
DC COM
PS-ON
If I'm right: DC-COM = GND,
...
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Y capacitors regulations at the secondary of a class-I power supply
I know safety-rated Y1/Y2 capacitors are required at the AC line input for EMI purposes, but what about the isolated secondary of a class I power supply?
What are the safety regulations here?
Can I ...
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Can I use a lower voltage adapter for my Philips Sound Bar? [duplicate]
Edit: I connected the 19 V 4.73 A HP laptop adaptor to my sound bar and it is working perfectly. No humming or distortion. I am so happy. I am running it for long 8 continuous hours and its fine. :)
I ...
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ATX PSU standby section starting problem
I am having a problem in a ATX supply.
The problem is when I plug PSU to 230 V AC the PSU won't start thus I opened and tested 5vSB not present on wire and also not on diode (IN5822).
Thus started ...
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How to Inject Noise into a DC Power Supply with a Function Generator
I am trying to test a filter I have designed on a PCB which aims to minimize the noise of the input power supply. To do this, I need to have a noisy power supply. I currently have access to a benchtop ...
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Designing a self-power current range detector
I need to design a current range detector i.e. a module with an AC current as input and a digital output. When the current is within range (i.e. between 0.1A AC to 2.5A AC), the output should be a ...
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The best way to step down 12V to 5V with at least 10A current from a PS3 power supply for a WS2812B LED strip
I am new to electronics. I had a PS3 Super Slim power supply lying around, which outputs 12V up to 13 amps. Recently, I bought a 5-meter strip of WS2812B LED strip, which needs 5V, and the recommended ...
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Simple door phone circuit
I'm a novice electronics engineer and I have a simple circuit from an analog door phone system. It's the circuit of the push button. It basically takes an input of 12 VAC so it powers 3 LEDs for the ...
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Constant current controller for a 5V, 400A supply [closed]
I'm a grad student with some practical experience in electronics but very little foundational understanding. I have a new project that requires a low voltage and high current (5V, 400A) and I've ...
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Understanding LM723-Based Variable Voltage Power Supply Schematic
Here is the schematic of the PS-1502dd power supply, which uses an LM723 to create variable output voltages. I am having trouble understanding the semantics of this power supply. According to the ...
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Why is my 5V linear regulator giving out 6.34V?
Update :-(:
I tested the pinouts of the IC with a multi meter and the connections are fine. Then I discovered I had done a very stupid mistake and connected Vout where Vin should have been connected. ...
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Why does my voltage from the DC supply box change on its own?
I have a simple electric motor setup that spins using a simple copper coil rotating around between two metal nuts. The nuts are connected to a DC supply box (on the right) like this:
Sometimes, ...
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Need help identifying smd capacitor value
I have a samson auro x12D powered speaker and I cannot find a schematic or service manual anywhere on the internet for this board.
I identified 2 open capacitors (c10 c11) on the power board but I ...
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ATX Computer Power Supply Spark in Non-computer Application [closed]
I would like to ask for your assistance with using a Silverstone DA1650 Gold computer power supply (you can find more about it here: Silverstone DA1650 Gold) for a non-computer application. In this ...
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Does this PSU have no regulator?
Regarding this adapter, there's big output voltage difference between no load and load condition.
Is this a typical linear supply or missing a regulator? Is it intended to be used for what loads range?...
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Designing my own scale with 0.01 gram resolution [closed]
I'm aiming to design a weighing scale with a resolution of 0.01 grams. I'm familiar with basic electronics, but I'm not sure where to start to achieve such a high resolution. Could anyone provide ...
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Multimeter range
I've been using a small multimeter meter and the problem is that anytime I want to measure amperage that exceeds 200 mA, I have to switch the red probe the 10 A port. Unfortunately, I can't get the ...
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My 12V 10A circuit is not working properly
I'm still quite new to electronics and I wanted to build myself a 12 V 10 A power supply for a different project. I followed this circuit design since it looked simple enough for me.
Did all the ...
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Power supply oscillations when driving LEDs with microcontroller
I driving some LEDs at about 114 Hz with a power supply of 9 V and a max current supply of 150 mA, LEDs are running about 60 mA I have some LEDs in parallel. If I increase to 200 Hz it's the same, How ...
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Lower current than specified with LEDs' calculations for power supply
I have 1 meter of this ledstripe with 144 LEDs per meter. It is specified:
144 diodes/m = 34.56 W/m
That would make 6.912 A per meter. But when I connect them and ...
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Type 3 compensator with opamp compare calculation/simu and measured difference
I'm designing a type 3 compensator with an opamp for a flyback which is operating in a constant voltage mode.
Therefore I measured the plant and started to design a suitable type 3 compensator to ...
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Reducing the size of magnetic components
I read some documents and papers and found a couple methods to reduce the size of magnetic components.
Recycling the energy stored in parasitic elements such as transformer leakage inductance, ...
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Why LLC converter can't work in wide output voltage
I've been studying about LLC Converters recently and I've come across a few points that I don't quite understand. Here are my questions:
1.Why can't an LLC Converter achieve a wide output range? Isn't ...
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Designing a Power Supply for a 24V 350W Motor Using 18V Tool Batteries: How to Safely Parallel Them?
I'm currently working on a project where I need to design a device to power a 24 V, 350 W motor using 18 V tool batteries. The 18 V output from a single battery is sufficient in terms of voltage, but ...
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Voltage Tolerance for Power Supplies
I'm designing an off-grid office and am trying to figure out if I can get away with one large DC-DC converter rather than several small ones. I have two main devices that I will be connecting to power:...
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Transistor overheating in a linear power supply [closed]
I'm a novice electronics engineer and as I was trying to fix an old linear power supply of a video door phone system, I found something interesting.
First a little info about the power supply. This ...
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Flyback converter design using UC3843
I am designing a offline power supply which will 24 V as output with 2.5 A. I found UC3843 as better option. I used TI we bench tool to design my power supply. This is the schematic I got from it. The ...
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If the RPM of an AC generator doubles, and its frequency and voltage doubles, how much does its current decrease?
From what I understand, if the rotation rate of an alternating current generator increases, its voltage increases at the same rate...
I also have learned that the total power produced increases ...
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Charge one powerbank from multiple sources
I am in need of more power while traveling and for this purpose I will create a setup with one dynamo hub, one larger solar panel (30W) on the back of the bike and a smaller (10W) solar panel in front....
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Turn off level shifter
I'm designing an LED controller with ESP for SK6812 and there are many of them connected so I need an extra power supply. The ESP uses 3.3 V but the LED's 5 V so I need a level shifter. There is not ...
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Difference between Single-supply and Dual-supply CAN Transceiver
I was about to choose the MCP2558FD CAN Transceiver for a personal project. I found on the datasheet the following diagram:
If my understanding is good, I can use it as a dual-supply Transceiver.
But ...
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Significance of wire wound resistor
I am working on HVAC control panel for 4 wheeler. The circuit for the panel was designed by our previous team. Currently I am facing an issue with a component which is a wirewound resistor in the ...
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Dual supply circuit
I am designing a circuit with 2 48V power supplies to feed a load. My goal is to give priority to Supply 1 when available since I need the load to be fed by only one supply at a time. This is what I'...
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DfPlayer Mini not working when using three LR44 batteries
I'm working on a small project that plays audio. This project uses an ATtiny85 and a DFPlayer Mini as well as some other small components to make the whole thing work. I've tested the circuit using an ...
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Repairing a receiver sub-power supply and need to identify a TO-252 component for replacement (1510B T3330 T237)
I have a receiver that, when trying to turn on, would shut off immediately. Using a hair dryer allowed the receiver to turn on. After a bit of troubleshooting, I found some questionable solder ...
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Regular DACs versus audio DACs
Context
In trying to make modular linear power supply with digital control, I figured I'd need a DAC to output the correct voltages into the feedback circuitry (two - one for voltage and one for max ...
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TN-S Earthing parallel return paths when multiple MEN links
I have a bit-of a unique situation. I have a generator which is running a TN-S earthing system. It is powering demountable offices.
I assume that all sub circuits would have RCDs in the demountable, ...
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Estimation of measurements with a multimeter
I have an EMU-APS PCI sound card which was damaged by a bad PC power supply.
The card is old but costly to replace and of very high capability, so I am attempting to repair it.
As it is a proprietary ...
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Battery insulating pull tabs for LiPo packs?
We are planning to ship devices that contain a small LiPo battery connected to the PCB through a JST connector. Ideally, we'd like the device to be completely powered off until the customer activates ...
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Vintage LM317T Linear PSU Improvement Suggestions
Recently I came into possession of two very old linear PSU devices from 1993.
I replaced the caps and tested the devices and both work. I have been using them in conjunction with 12 7Ah lead acid ...
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Why is there a seemingly big difference in power supply input and output watts? [duplicate]
Looking at a power supply like Corsair AX 860W power supply I notice there seems to be a big difference between the AC input watts (240 V x 5.5 A = 1320 W) and DC output watts (860 W).
I read on this ...
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Laptop connectors and universal chargers (tips M3, M4, etc.)
I am interested in having more information about connectors and identifiers (M3,M4,...M31) used by laptop universal chargers.
Is there any "official" list or convention for laptop ...
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High Current Step-Down Conversion 12V-5V/100A
I inherited two 12 V, 1200 W server power supplies a while back and I'd like to press them into service as electrolysis cell power supplies for making (per)chlorates. I need to drop the output to ~5 ...
