Questions tagged [power-supply]
An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.
10,351 questions
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First PCB design review — ESP32-S3 driving HUB75E LED matrix panel, single board
I'm building a WiFi-connected RGB LED matrix display. The idea is a single PCB that sits behind a 128x64 P2.5 HUB75E panel, connects to the internet, and pushes pixels.
This is my first PCB. I've ...
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Does On-Chip Decoupling Negate the Need for PCB PDN Analysis
I am preparing a PDN decoupling simulation for a KSZ9897RTXI switch, which utilizes 1.2V, 1.8V, and 2.5V rails.
I am trying to establish the maximum frequency range for my target impedance analysis.
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Frequency Jittering in PMIC
Why the Frequency Jittering function in power management chips mostly uses triangular waves instead of sine waves, and what are the considerations behind it?
Why are the frequencies around 1kHz to ...
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Adding an offset voltage to feedback voltage divider on a switching battery charger
I have some sodium-ion cells (3V nominal, 3500mAh) that I would like to use instead of Li-Po for a solar powered project, to hopefully get better performance at low temperatures. One of the issues ...
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Wall wart for Atari 2600 shows 17v-34v when it should be 9v
I just bought an Atari 2600 Vader on eBay. It came with what I assume to be an original power supply/wall wart. Because the plastic case had cracked open on the PSU and was held together with ...
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Peltier Cooling system power supply problems
I am trying to show my students thermoelectric refrigeration.
I am using this Peltier setup.
Lsgoodcare DIY Peltier Cooler Kit 12V Semiconductor Thermoelectric Cooler TEC1-12706 .
It is specified as ...
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Review request: Transformer-based dual supply (12V, 15V, 5V buck) using 7812/7815 + MC34063
I would appreciate a review of this transformer-based power supply design.
The goal is to generate :
+12V (for relay and control circuits)
+15V (for gate driver supply)
+5V (1A, via MC34063, for logic ...
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Power supply from reputable vendor providing voltage 30% off
I ordered a 24V AC power supply for the repair of a 1980s guitar FX rack unit. When it arrived, I was surprised to find that the voltage came up as around 31.3V, as seen on the photo -- about 30% off ...
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Arduino and common ground with external power source, will it explode?
I am building right now a device for some analysis for my company. There, we use mainly 24VDC components, including some pumps that work with PWM. So for that PWM controlling I use an arduino. The ...
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Isolated supply collapses when connecting analog output stage
I designed an Arbitrary Waveform Generator, AWG, project with multiple galvanically isolated stages. The relevant part is an analog output stage powered by an isolated DC/DC converter that generates +...
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Connecting AC Input Into Switching Power Supply
I am using the ALRS12V5AT Switching Power Supply to convert wall 120V AC power to 12V DC that I am using for a project. In the interest of safety, I want to understand how to wire up the cables into ...
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Full-bridge transformer volt-second calculation: why is D = 0.75 used and need clarification to Ts?
I am currently studying transformer design examples from the book Fundamentals of Power Electronics by Erickson and Maksimovic (3rd edition), and I am confused with calculating the volt-second of ...
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Are there devices where voltage matters besides the current? [closed]
A lot of electrical devices expect specific direct current flowing through them.
For those of them, which resistance is static, manufacturer can guide user with power supply only providing the needed ...
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Why is SEPIC converter named so? Is it a misnomer?
This is a follow up question to What does "Single-Ended Primary Inductor" mean?
The below doubts are not clear from the previous answers.
"Single-Ended Primary Inductor Converter":
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What does "All used voltage pins (Vx) must be terminated" mean in this Seagate drive manual?
See https://www.seagate.com/content/dam/seagate/assets/support/internal-hard-drive/enterprise-hard-drives/exos-x24/_shared/files/Seagate_AI_IoT_SATA_Product_Manual_210250000.pdf
On page 32:
What does ...
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