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votes
1answer
42 views

How to safely wire power supply

I plan to use a small 220v to 5v buck converter I bought, to power a Wemos D1 mini from 220v mains power. I am not sure how to safely hook it up to the mains power. It seems that because the system ...
0
votes
3answers
106 views

Can a Variable Frequency Drive convert standard wall outlet (120V/15A/single phase) to ~220V 3 phase?

In my workshop I have a device that requires 220V 3 phase power, with a requirement of up to 1.5kVA. In North America, my wall outlet provides ~120V/15A single phases. (EDIT - my device can take +/- ...
0
votes
0answers
41 views

Bypassing 110v power-supply on LED light-strip?

I am wanting to use 2 16.4ft rolls of multicolor LED strips in my enclosed trailer for lighting. They come with 110v power supply that plugs into another coverter that the LED lights plug into. Is ...
3
votes
1answer
149 views

Powering 9216 leds @5V, @24V with converters

I am struggling with a power supply question. I would like to power up and control 9216 LEDs -- strips of 144 LEDs/meter (WWA SK6812 - just like the RGB kind). These are powered at 5V and draw 43.2 ...
2
votes
1answer
64 views

LM2917 draws too much current

I built a prototype of a frequency-to-voltage converter using a LM2917 following exactly the "Minimum Component Tachometer Diagram" example schematic - just to play a bit and understand how it works. ...
1
vote
1answer
138 views

How can I boost 1 Volts 30 Ampere input to 5V with maximum Current limit of 5A?

How can I boost 1 Volt 30 Ampere DC input to 5V DC with a maximum Current limit of 5A?
0
votes
3answers
652 views

Can I use a power strip with max 250v to a 120v power outlet without a converter? [closed]

I'm going to move to Canada from EU. From my research, most people said that if someone from US moves to EU, they'll need a power converter otherwise it might fry the thing. My question is, if I use ...
-2
votes
1answer
51 views

Looking for a component that lets me choose where to draw power from [closed]

I would like to have a switch or box that allows me to plug a battery and wall power into the box, and then has a switch that chooses which power to use for the output. The ideal inputs of the box ...
0
votes
1answer
34 views

Issue with step-down converter feedback and where to place it

so I figured out where the buzzing is coming from in my circuit, and I think I'm starting to see the problem with it. Here is a schematic I have: The DC/DC step down converter I'm using: http://www....
0
votes
1answer
68 views

Calculating power supply current output

I have a 15V power supply powering 2 Dc/dc converters that are the same. The converters are connected so that the outputs are 10V and -10V (the - terminal of the 10V converter is tied to the + ...
0
votes
1answer
212 views

Buck converter question

I am trying to design a step-down power supply. I was searching and browsing from Texas Instruments products and found one that might be the best for my use. I want to step down from 24V to 5V, output ...
1
vote
2answers
524 views

2 dc-dc boost converters to create dual power supply

I'm doing a project with a Silicon Photo-multiplayer where the breakdown voltage when negatively biased is -25V. I was wondering is there anyway to connect two DC to DC boost converters to give me a ...
2
votes
1answer
4k views

Polarity symbols on universal AC-DC adaptor

I have a universal AC-DC adaptor that has the following symbol by the polarity switch: Is it safe to assume that the top part of the diagram indicates the polarity of the inner surface of the ...
-1
votes
1answer
73 views

Will Appliance with Power Supply AC 100 -240 V 50/60Hz work in US? [closed]

I've got a new Japanese game system; I've had some in the past and used a step down converter to safely use them. That was a long time ago. The power supply for the new one I have reads: ...
0
votes
2answers
171 views

LTC3649 step down controller (lab supply) add current limit feedback led?

On the 20th page LTC3649 there is a good typical application picture. How can I add a led if the set current equal the actual current? It is possible? Thanks.
2
votes
2answers
2k views

How to obtain negative voltage from positive voltage ?

My question is simple. I have one power supply which generate 28 volt. I would like to obtain -18V and 18V. I don't want to voltage divider with resistor. I generated 18 V to use regulator. But I ...
-1
votes
4answers
851 views

How do I use this Switching Power Supply with power from a wall outlet?

I assume the point of these devices is to convert wall outlet power into something useable for electronics projects/products. In my case, I need 24V at 5A for testing an electric motor. So I am ...
1
vote
2answers
90 views

Supercapacitor Voltage Draw

If I am charging a super capacitor with buck converter, that is a 1 amp, 1-18 volt output, and the capacitor is rated for 2.5 volts, how do I stop the buck converter from feeding it more than 2.5 ...
1
vote
2answers
209 views

High Current DC Power Supply

I'm attempting to build a compact way to charge six laptops (of the same model) so that I may avoid using six individual power cables. I'm trying to make it cost-effective yet safe. My initial design ...
-1
votes
1answer
358 views

Convert 5v 20mA to 12v 0.4Amps

I am going to be making a 3d printer and i have made a circuit to control it. However, the stepper motor is 12v 0.4amps and the circuit is 5v 20mA. I need a way to amplify, but if you can show me, ...
0
votes
1answer
1k views

Need circuit for 12 volt 2 Amp step down power supply from 18 volt 1.5 Amp Input

I have a power supply which outputs 18v 1.5 amp. For the purpose of my project, I need a 12v 2 amp power supply. I was wondering, if I can make a simple buck converter to convert 18v 1.5amp DC to 12v ...
0
votes
3answers
156 views

Why use Optcoupler + Mosfet?

I saw this project: http://diyhacking.com/arduino-lamp-dimmer/ which I'm interessted to(except that I will have to use some 24V, still enough to hurt the Raspberry Pi). There is several things that I'...
0
votes
1answer
293 views

Help me hack this speaker, where would I introduce DC voltage

I have a speaker that runs off of AC (there is a switching converter within the speaker) I'm attempting to convert it to battery power, From my understanding the speaker runs off of 5V (someone else ...
-1
votes
2answers
7k views

Converting a 9v Battery powered Device to a 9v dc power supply [duplicate]

I have an old Vivanco MX300 mixer which runs of a 9v battery. I have it in the same place and it's an inconvenience having it run by batteries. Could I use an old AC/DC adapter that would supply 9v ...
-1
votes
2answers
2k views

Convert DC generator to variable AC

Is there a way to convert a DC generator signal to AC and be able to control the frequency and current? Ultimately, I would like to use this signal to measure the impedance of a battery.
2
votes
1answer
519 views

AC-DC converter, transformer modification how-to

I would like to wire an AC-DC converter based on a datasheet schematic. I try to describe my problem. I would like to increase the max current output. The AC->DC converter has a bjt driving a ...
3
votes
3answers
1k views

Transformless power supply without ground

I would like to make a transformerless power supply, I found some description on the Internet like this pdf provided by Microchip. My question is it is possible to use only the phase line(without ...
2
votes
1answer
4k views

Where can I find a 110V/60Hz to 220V/50Hz voltage converter [closed]

I'm debugging a power supply issue with a product made for a 220V/50Hz power source. Most made-for-USA step-up convertors provide 220V/60Hz (from a 120/60 USA mains supply). I'd like to try providing ...