Here is a 5 volt @ 700 millamp switching power supply are Gone at GoldMine Electroni

sam_sam_sam · 2011-03-21 10:52

http://www.goldmine-elec-products.com/prodinfo.asp?number=G17395 They were $0.79

"Small lightweight charger made by Samsung part# ATADM10JBE has standard plug for AC outlet and special connector on other end. Cut off the connector and you have a nice lightweight charger/adapter capable of putting out regulated 5VDC at up to 700mA. Size of adapter body only 2.3" x 1.1" x 1.4". Can operate from 100VAC up to 240VAC. New in sealed bag (you can cut off connector if you desire). Reg $2.29 each. G17395 "

One note about this (you can cut off connector if you desire). you can open the the connector that at the end of the cord it has two screws to open it then you do not need to cut any thing off

I am using this to power my Propeller Education Kit that I put on a Proto Board

Beau Schwabe · 2011-03-21 16:30

sam_sam_sam,

That's a good find... I have re-purposed a couple of our own cell-phone chargers in a similar way. By the connector in your link, it looks like that's what the power supply was originally intended for. A few that I have used are rated at 5V 500mA.

localroger · 2011-03-21 16:43

By an amazing coincidence 5V @ 500 mA is what you can safely draw from a USB port without negotiating with the USB controller. My cell phone is charged through a micro USB connector, and a lot of stuff is being designed around that so you can charge them from laptops and hubs.

Beau Schwabe · 2011-03-21 17:01

It's also an interesting coincidence that after dropping a 5V supply through 1 diode you get 4.4V ... thus allowing you to 'charge' your lithium cell-phone battery without needing 'over charge' protection circuitry. Let's just hope the 5V stays where it belongs.

sam_sam_sam · 2011-03-21 17:56

A 5V supply through 1 diode you get 4.4V ... thus allowing you to 'charge' your lithium cell-phone battery without needing 'over charge' protection circuitry. Let's just hope the 5V stays where it belongs.

That not the bigger problem

Here is the real problem and that is this that the Switching Power Supply dose not over current I seen a few them do this and had to use a LM317 to control them

I have seen a few over current at least 500 millamps over what they are rated at

http://www.allelectronics.com/make-a-store/item/PS-10/1-AMP-SWITCHING-POWER-SUPPLY-w/SELECTABLE-OUTPUT//1.html

Here is an example of one that I just hacked to charge lithium cell 8.4 volt battery pack when set to 8.4 volts It was charging at 1.47 amps and is only rated at 1 amp

h.250,w.150,m.ecf72bf88ca94702fd66e52994a64f7b,3178,ps_10.jpg

localroger · 2011-03-21 18:06

Generally the current rating for a power supply is the minimum it can supply continuously. Most power supplies can and will supply more than what they are rated for. While they are oversupplying their components heat up, and it's usually the voltage regulator overheating that finally shuts the power supply down if you ask it to continuously supply too much power. Switching power supplies are very efficient though, and don't generate a lot of heat compared to analog supplies, so they can run a long time at more than their rated current before shutting down.

sam_sam_sam · 2011-03-21 18:30

localroger wrote: »

Generally the current rating for a power supply is the minimum it can supply continuously. Most power supplies can and will supply more than what they are rated for. While they are oversupplying their components heat up, and it's usually the voltage regulator overheating that finally shuts the power supply down if you ask it to continuously supply too much power. Switching power supplies are very efficient though, and don't generate a lot of heat compared to analog supplies, so they can run a long time at more than their rated current before shutting down.

I will have to run one in a over current state and see what happen to it and see how long it will run that way before it shut down and if it work again once it cool down

BTW this power supply has 1 amp MAX on it the one I was talking about

Don M · 2011-03-23 12:57

I ordered 20 of these yesterday and just got an email stating they are sold out

These would have been great for a project I'm working on. Thanks for finding these deals too bad I missed out.

sam_sam_sam · 2011-03-23 13:16

Take a look at these two pages you might find something that will work for you

http://www.allelectronics.com/make-a-store/category/480/Power-Supplies/1.html

http://www.goldmine-elec-products.com/products.asp?dept=1007

I hope this helps

Here is a 5 volt @ 700 millamp switching power supply are Gone at GoldMine Electroni

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