All Questions
Tagged with diy power-supply
24 questions
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54
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DIY ATX Desktop PSU turns off after using full load fast
I have built a desktop PSU with a fuse, output connector and a buck boost converter. The problem is that when I set the maximum power of the converter at once, the PSU turns off automatically. However,...
1
vote
1
answer
54
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Power supply from socket to light-up bracelet
I'm pursuing a DIY project, creating a memory box for The Eras Tour that had LED wristbands. In said wristbands are 2 CR2032 (3V, 0.2mA) disk batteries on square metal plates connected by a metal ...
1
vote
3
answers
317
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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 ...
- 13
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votes
1
answer
141
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Simple circuit to cut voltage below 14V
I would like to power a DIY bluetoothbox from a Bosch Professional 18v battery but they do not have a BMS as far as I know. So I need a way to cut off all energy drawn from the battery as soon as the ...
- 1
0
votes
1
answer
579
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What type of wire can I use to run 5V, 30A to my Arduino controlled relay module over a distance of 10-12m?
I'm building an Arduino-controlled Christmas light show. I power my 16-channel relay module with a 5V, 30A supply. It is placed outside the house and I want to place its power supply powering the ...
- 3
3
votes
2
answers
4k
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Can you power a smartphone (no battery at all) by a power supply alone?
I have a project in mind, where I need alot of parts that quickly would make this project really expensive.
Then I thought that, all the parts I need is already in a smartphone, but I don't need a ...
- 31
0
votes
0
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121
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DIY BLDC - power supply sizing?
I am currently in the process of building a sensor-less 3ph axial flux BLDC with concentrated windings. I’m thinking 12s10p but have not yet decided. It’s just for a project - not for real world ...
- 11
4
votes
3
answers
822
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Matching number of LEDs to power supply
I have an LED power supply - constant current with output 1.4A/96W/23-69VDC. I want to buy a number of LEDs and connect these in series.
What do I need to calculate to know how many of the following ...
0
votes
2
answers
254
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What voltage should DIY laptop external battery have?
I want to make an external powerbank for my laptop, since its battery cannot be removed (MSI GP62M 7RDX).
What voltage should my battery have?
18650 elements have nominal voltage of 3.7.
My laptop ...
- 121
0
votes
1
answer
137
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Understanding Power/Current/Voltage drawn by LED Strips
I am trying to create a LED lamp which will be powered up by a battery. Lets assume I want it to run the lamp for 1hr. My LED Strips operate at 12V with 19.2W/M. I am using around 1.7 Meters(198 LEDs) ...
1
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0
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105
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12VDC Switching to 17VDC high amerage
It's been years since my undergrad work as an EE. I am a physicist and medical researcher now, but, as a startup, we all take on anything we can.
Let's face it... 12VDC high current PSU's are cheap. ...
- 31
1
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4
answers
5k
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DIY 5V power supply from phone charger
I want to power 25 Adafruit NeoPixel LEDs. According to the specifications they draw a maximum of 60mA at 5V each. In total that would be 1,5A at 5V.
I would like to use a 2A USB phone charger as a ...
- 13
1
vote
1
answer
2k
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Meanwell vs generic power supply [closed]
I am currently planning out a custom 3D printer build which will run on a 24V 600W power supply. I have specked out for a $90 MeanWell supply from eBay, but I've noticed similar generic power for ...
- 115
0
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1
answer
2k
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Analog current and voltage adjustable power supply design
I saw this circuit on some recommended YouTube channel and I thought it would be a good start to building a custom PSU, learning some stuff along the way. I would like to keep the circuit analog for ...
- 109
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31
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Common rectifier (or source) to power testing equipments
I was thinking of a design of an all-in-one box that contains a DIY Oscilloscope, a DIY frequency generator, a DIY bench-top power supply (by a buck converter), and a multimeter (broken out from the ...
- 103
2
votes
5
answers
444
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How to power up 50 LEDs? (DIY 'fireflies' project)
I want to install lots of tiny LEDs lights in my garden (at least 50).
I DON'T want high voltage cables in my garden so I am thinking in getting a high power, low voltage transformer to power up these ...
- 834
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2
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597
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Connecting 12V fan to LM317 DIY PSU circuit
I am working on a simple adjustable DIY power supply using an LM317 voltage regulator. J1 in the image below represents the transformer rated at 18VA, which rectified produces about 25V DC. The output ...
3
votes
1
answer
6k
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What is the difference between 4-, 5- and 6-band resistors?
I have been buying PSU DIY kits from eBay and I am learning a lot the PSUs that I've soldered together use the LM317 and the resistors used in R1 and R2 can change the outgoing voltage. The LM317 PSU ...
- 31
2
votes
3
answers
1k
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Put outputs of 2 computer power supplies in series?
I've been working to figure out an LED lighting project for my classroom for a while now, readings on this site has helped. One part of the solution is to combine in series computer power supplies (...
- 63
1
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3
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10k
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Wiring of a USB Y-Connector [duplicate]
Recently I bought an LG External DVD Writer that is TV compatible. But after a couple of times it stopped working on my Sony LED TV. It would start spinning, but stop after two seconds. This would go ...
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-1
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3
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386
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Need to build a compact power supply that runs off the 240V socket and provides 12V, 5V and 3.3V for an Arduino Project [closed]
I want to have an as-compact-as-possible (but no limit on size) power brick/supply that takes power from a UK Wall socket and has multiple outputs with different voltages. Need 12V@2A for stepper ...
5
votes
3
answers
10k
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Safety when using ATX power supply as benchtop supply
I found many pages where people convert an ATX power supply to a benchtop power supply to give 12, 5, 3.3V.
However the current output can be very high (several amps).
When using this and you NEED ...
- 253
0
votes
1
answer
69
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PSU with dc stepdown buck
I want to connect different LEDs that have these parameters (the LEDs I am using are just generic LEDs I got from ebay.):
Led 1: 6.4V - 7.2V @ 0.7A
Led 2: 2.9V - 5.6V @ 1.9A
Led 3: 8V - 12V @ 3.4A
...
- 115
3
votes
3
answers
2k
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Is my PSU design safe, what should I change?
Normally I would just go and breadboard the design out, but since this is using mains power, I would rather ask experienced people first.
I want to build a desktop 170V DC power supply to fiddle ...
- 403