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Wiring 5v to a 12v powersupply

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Audioguru

Sep 24, 2016
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Ripple from the LM2596 will be its output voltage jumping up and down at its 60kHz switching frequency and lower frequency discontinuous mode switching. Many audio and video loads do not work well when there is that much ripple. You never said what the "something device" does.
 

LayZ

Apr 14, 2018
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yes but not with this device. Right now I'm actually smoking Homegrown Nicotiana Rustica in a pipe waiting for my new vaporizer to come and had to put the pipe down when i got the message notification.


I just pulled the battery pack out of the old one that had the usb port go bad and need to figure out how to wire them for recharging now. Which is something I was going to do in a few months.

One thing I'm making in specific with this setup is a drying chamber/dehydrator.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Those regulators are rated for up to 800mA (the same as 0.8A).

However, if you're using the 5V for heating, this unit will dissipate more heat than your vape thing. It will likely shut down due to it exceeding its max temperature if used for very long. Go for the switch mode version that I recommended.
 

LayZ

Apr 14, 2018
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If I wanted to wire these 12v 5a psus to run a 12v 5a device like a small robot the below calculator didnt tell me much. Is 11.91 going to cause problems compared to 11.99 does this mean 12 gauge is the sufficient wire? 12 is what I was going to use for larger psus and was thinking it may be overkill for 12v 5a.

upload_2018-4-15_9-53-34.png
 

BobK

Jan 5, 2010
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That calculator shows that any of those wire gauges meet your specification for less than a 2% drop in voltage over 1 foot. In other words, 22 gauge is sufficient, and the wires could be extended to nearly 3 feet before they would drop 2% of your 12V which is 0.24V.

Bob
 

LayZ

Apr 14, 2018
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Ok the way you described it makes sense. I'm seeing a few kinds of power switches.

Power supply switch (250V, 1A) (seen these used for 12v 5a psu)
16mm 12v 3a (would prefer to buy these)
19mm 12v 5a (was going to buy these by specs)

I'm seeing 250v 1a being used in a similar application to flip on the 12v 5a psu, how is the 1a switch sufficient does this mean the 12v 16mm 3a switch will be sufficient where that 250v 1a is as a replacement switch?

I'm using a regulated switch led power supply, I think that may make things more clear.
 
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dave9

Mar 5, 2017
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What EXACTLY are you doing? Not a summary, not a type of thing, but exactly what are you powering, including pictures and/or links?

There is no need to go through any of this just to produce heat. A mere resistor connected to 12V will do that more efficiently at the single point where it's needed unless it's an ignition source and you need maximum heat density.

This is another one of those topics that becomes a large time-sink because all specifics and requirements were not laid out concisely at the start. Now you're talking about robots, then switches, and still not linking to specific things, lol.
 

LayZ

Apr 14, 2018
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I'm making a really cheap version of a few things.

I just need to know the electrical side and can fix any errors the poster had using assumptions. And I've also asked questions for 3 entirely different things/builds.
 
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dave9

Mar 5, 2017
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^ And leaving out the specifics which is counter productive.
 
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