Colloquial name for an AC/DC adapter where the AC pins and regulator circuit are combined within a single enclosure. Some other regional names include plug pack and power adapter.
4
votes
2answers
154 views
Do 2 5V DC wall warts in the same AC outlet have a common DC ground?
I'm trying to power a LED strand from one wart (5V), and my logic driver FPGA from another wart (also 5V). Both warts are plugged into the same outlet strip. I know I should probably power them from ...
0
votes
3answers
141 views
Is it safe to parallel wall-wart inputs via a single cable?
I have 4 identical devices each with their own low amperage wall wart, and I want to tidy up my power cabling. (They are more like laptop power supplies than wall warts, as they have an AC cable, ...
1
vote
0answers
79 views
AC adapter: is excess current rating okay? [duplicate]
Until now, I've always been using a digital TV decoder instead of my TV´s integrated decoder. The digital TV decoder supplies the antenna's amplifier with power through the antenna cable, but when I ...
0
votes
1answer
83 views
How can I reduce the power consumed with wall warts?
I have been designing a project that requires a 5V for some components and 12V for others. I am planning to leave this plugged in 24/7 so I want it pretty efficient. I know they don't waste that much ...
3
votes
3answers
145 views
Do I need to use any external parts with a voltage regulator?
I have recently bought a voltage regulator (link, specs, and datasheet below) and I am regulating a AC-to-DC 9v power supply into 5v with as little components as possible. In the datasheet, all of the ...
-1
votes
2answers
53 views
subsituting one transformer for another [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
I have an eliptical machine that is no longer being manufactured. it appears that the AC to AC adaptor ...
5
votes
1answer
109 views
Determining if a power supply is isolated?
I've been looking for a low cost adapter I can use to power some electronic circuits I'm playing with. Pretty much the only requirement I have at this time is that the adapter is mains isolated for my ...
0
votes
0answers
44 views
Connecting multiple power suplies [duplicate]
Possible Duplicate:
Using multiple power supplies to increase current
Can I use multiple power supplies of the same voltage to get a sum of their currents? (e.g. five 5V, 2A power supplies ...
7
votes
4answers
392 views
Does appliance wattage differ by country, since the voltage does?
As an example, I have an AC-DC "wall wart" that specifies an input voltage of 100-230 volts and an input current of 0.3 amps. Since my mains supply is 230v:
Does that mean that it uses 230*0.3=69 ...
2
votes
1answer
97 views
Powering multiple circuit boards from one wall wart
I've got two home-build Halloween props that currently run from multiple battery packs. I want to switch this to a single wall wart. Here's what I need to power: 1 arduino, 2 Cowlacious audio ...
2
votes
2answers
454 views
Switch mode power supply
I am currently using a 5V DC, 1 amp wall wart to my circuit which is on a PCB. The wall wart plugs into the PCB using a barrel jack. All in all, my circuit uses around 300mA and can take between ...
6
votes
4answers
1k views
Least expensive way to plug in a microcontroller into 120V (without wall wart or batteries)
I need to be able to power a Atmega168 by plugging it into a wall. The circuit is a little bit more complex but not too much. The Atmega168 needs between 1.8V and 5V at 200mA. The ideal solution ...
6
votes
1answer
4k views
Converting passive USB Hub to powered USB Hub, by adding regulated wall-wart as power supply?
From a quick price-check on ebay,
Passive (bus-powered) USB Hubs - ~ $2-$5
Powered (externally) USB Hubs - ~ $15-$20
My use-case is to expand the no. of USB ports on a ARM-based SBC, and to embed ...
1
vote
2answers
295 views
Wall transformer amperage
I have a battery charger that uses a 24VDC 300mA wall transformer. The transformer died, and the closest replacement I could find was 24VDC @500 mA. The new transformer did seem to charge the battery ...
5
votes
4answers
705 views
Advice on cleaning up 5VDC from a wall-wart
Assumption: I think it's generally true that commercially available AC/DC wall-worts can be expected to be pretty noisy (e.g. you can't count on much better than 5% stability).
Background: I'm ...
13
votes
5answers
1k views
How much power is really wasted by a wall wart?
The title pretty much sums it up... Hyperbole aside, how much actual power is consumed by a typical wall wart when the device it's attached to isn't powered on? And are there designs for wall warts ...
