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5v Power Supply?


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#1 iced98lx

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Posted 18 July 2013 - 03:14 PM

What are those of you in the US using for a reliable 5v powersupply? I need to power two 8 channel relay boards and my 20x4 LCD. I'll leave my 5v sensors on the netduino's 5v out for now, since I don't want to get into accuracy issues. Right now when my relay's kick over my LCD dims- can't be good for the board.



#2 NooM

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Posted 19 July 2013 - 12:08 AM

iam using that:

 

http://at.mouser.com...ualkey967-LS355

 

i like it a lot. there are also more simmiliar aviable, with different voltages and power.



#3 Dr Who

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Posted 19 July 2013 - 12:38 AM

What are those of you in the US using for a reliable 5v powersupply? I need to power two 8 channel relay boards and my 20x4 LCD. I'll leave my 5v sensors on the netduino's 5v out for now, since I don't want to get into accuracy issues. Right now when my relay's kick over my LCD dims- can't be good for the board.

 

When running my Netduino (or the Mini) I typically use the plug-in type that's normally associated with a now discontinued MP3 player. It produces 5v and even supports the logic. Interestingly enough I moved back to the Mini for what I'm working because something was decidedly all farbled with the timing on the Netduino (model 1) and the same program as written for the Mini worked there, but not on the Netduino (model 1).



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#4 nakchak

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Posted 19 July 2013 - 08:24 PM

Depends on how you want to use the device:

 

if you want the PSU integrated then you cant really go wrong with a LM7805 based circuit (as long as your current requirements are < 1.5 amps), you could also look at some of the simpler switchmode designs.

 

If the PSU is for bench use, then you cant really go wrong with an old PC power supply. there are loads of tutorials on the net about turning them into a bench PSU, then real advantage is that the current availible in even the cheapest of ATX PSU's is far in excess of most hobbyest needs and you have at least 3 very well regulated voltage sources (3.3, 5 and 12v)

 

Finally as the Dr. suggested a plugin "wall wart" style power supply can also be used.

 

Nak.



#5 MrGringoPy

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Posted 22 July 2013 - 10:55 PM

http://www.amazon.co...0?ie=UTF8&psc=1



#6 cce1911

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Posted 24 July 2013 - 07:57 PM

This is a great question, but I'm curious to know what people are using for battery packs. My N+2 is driving a single 4 channel relay board...



#7 iced98lx

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Posted 29 July 2013 - 04:49 PM

Thanks all, I think integrating a desktop PSU is likely the way I'll go, both for bench testing and for deployment.



#8 Wayneio

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Posted 01 August 2013 - 05:31 PM

iam using that:

 

http://at.mouser.com...ualkey967-LS355

 

i like it a lot. there are also more simmiliar aviable, with different voltages and power.

That looks good. Is there one with multiple outputs to control a few relays all across the house?



#9 NooM

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Posted 01 August 2013 - 05:40 PM

i dont know if there are any with more outputs, but i guess not. its not that big, and the connectors are quite large, so not that much space left :D

 

 

but you can add more than one cable ofc. like i soldered a little board with switching regulators and screw terminals, and than made a fat cable from the supply to this board, so i can use many different voltages of it. - i have the 5v version of the supply, but mostly use 3.3v (-except for some parts that needs 5v or more)

 

i suggest getting at least the 5v version and step it down.

 

a pc power supply has 3.3,5 and 12v - but its also way bigger and iam sure has more loss

 

edit: all across the house is bad with low voltage and higher current. it generates loss and heat.

 

thats why we use 220v here in the houses, to not burn the cables.. like a 500watt device is fine with 220v, but with 5v or so the cables would melt (or be way way bigger :D )






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