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Quick question for EE guy, 5volt, USB, soldering, etc (solved)
spystyle:
Thanks :)
EE-HERO to the rescue :)
Ond:
The simplest way IMO? Assuming one of your 5V adaptors is rated at 1.5 amps (it will be printed on it) just solder a plug that fits the socket onto the adaptor. Plugs in various sizes designed for that purpose with screw on barrel covers are available at most electronic hobby stores. You can twist the wires on intially to the plug to check the polarity is correct before soldering. I keep a range of plugs in my parts for this purpose to reuse those pesky bricks that seem to pile up when I'm not looking. This is neater than soldering directly to the pads on the board.
Thinking about it though, very few 'general purpose' 5V bricks are rated at 1.5A (most are at or less than an 1 amp) The exception to this is PS units designed to provide power to external drives. Good hunting!
shardian:
You need to run power directly from a +5 tap on the power supply. DO NOT power a device that big from the USB bus.
As for where to solder: Most of those plugs have the pin as positive, and the outside as ground. That way when the wall wart plug is just sitting there, the positive terminal is hidden inside the plug ( safety issue). Put you DMM on continuity test and put one lead on the pin, and the other lead on each solder point until you find the correct one.
Just to be sure, most DC things have a plaque that says the voltage and amps requirement, then below that have a simple diagram that shows a dot with a "c" around it. It will denote if either the dot or the "c" is positive or negative. If that diagram isn't on the device, the pin is positive.
danny_galaga:
--- Quote from: shardian on July 09, 2010, 08:51:15 pm ---
As for where to solder: Most of those plugs have the pin as positive, and the outside as ground. That way when the wall wart plug is just sitting there, the positive terminal is hidden inside the plug ( safety issue)
--- End quote ---
Out of curiosity, why would it be any safer?
Ond:
--- Quote from: danny_galaga on July 10, 2010, 12:10:09 am ---
--- Quote from: shardian on July 09, 2010, 08:51:15 pm ---
As for where to solder: Most of those plugs have the pin as positive, and the outside as ground. That way when the wall wart plug is just sitting there, the positive terminal is hidden inside the plug ( safety issue)
--- End quote ---
Out of curiosity, why would it be any safer?
--- End quote ---
Yeah I wondered about that too......
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