All Questions
40
questions
2
votes
2
answers
294
views
Transformer that doesn't take power when not used
With Is this (working) 2-doorbell system dangerous? and Why is it impossible to connect these two doorbells in series or parallel?, I arrived to the conclusion I need a new 220 V AC => 10 V AC ...
- 1,946
1
vote
1
answer
100
views
Battery replacement for 16 VAC
I have a mains power adapter that powers a small model train set. I would like the option to power this off a rechargeable battery, although I'm not sure this is possible, as it uses AC.
My current ...
1
vote
1
answer
143
views
Laptop AC adapter power cord [closed]
I suppose this is probably a stupid question, but my laptop was expensive so I want to make sure I'm protecting it well..
I ordered a second AC adapter for my computer, a used OEM one, but the cord ...
- 21
2
votes
1
answer
283
views
Power adapter 13.5V vs 15V
I'm trying to troubleshoot a problem with my Creative Inspire T6100 speakers.
They seem to be known for volume control issues.
In any case, I'm trying to determine if the power adapter is working as ...
- 123
0
votes
1
answer
68
views
What is the type of AC power in Power supply/Adaptor rating?
Most of times, Power Supply or Adapter has an annotation related to the power rating such as in this figure
For the red underlined value, I understand that it is the actual delivered DC power, and ...
- 149
0
votes
0
answers
90
views
Name of unusual power adaptor plug
I'm trying to find out if this kind of power plug for my laptop has a name, so that I can google for it more successfully.
I haven't ever seen any other like it, with its 4 pin connectors.
Does this ...
- 101
0
votes
2
answers
2k
views
Will connecting a NEMA 14-50 to a IEC 60320-C13 in this manner present issues
I have a japanese item in my house which takes a considerable amount of power (>1.5 kW) and takes a C13 power plug expecting 210-250V at 50-60Hz.
My idea was to connect a NEMA 14-50 power cord in ...
- 687
4
votes
4
answers
3k
views
Fuse keeps blowing on AC/DC Adapter
Recently I have noticed high freq. screeching noise coming out from my laptop's adaptor. I opened it up and found that it came from somewhere around a diode named egp10a. I checked it (unplugged) with ...
- 157
-2
votes
2
answers
11k
views
splicing ac adaptor cord which is positive and which is negative?
i lost my original asus router power adaptor. so i have a 12v power adaptor with a tip that fits my 19v asus wifi router, and i have a old 19v power adaptor that has a tip that is too small to fit my ...
1
vote
2
answers
1k
views
How can 10V AC change to 12V DC?
This is a circuit that takes 220V DC as an input. I understand how the 220V AC changed to 10V AC and changed to DC by whole-wave rectifier. But why is it 12V??
- 11
0
votes
2
answers
107
views
AC to DC converter device (AC adapter) with adjustable output voltage and adjustable output current [closed]
Is there a device available in the market that can take an input AC from mains and convert it into DC and output it, the output current and voltage must be adjustable.
I know there are AC adapters ...
- 335
1
vote
2
answers
2k
views
Is it safe to wire an AC-DC adapter directly to a DC motor? (with this setup...)
I just wanted to check that this setup is safe as I am not an electrical engineer, nor am I experienced...
I am using an AC adapter which outputs 12 volts DC. It has a max current rating of 6 amps. I ...
- 37
0
votes
2
answers
746
views
Why does dropping my laptop's AC adapter in the floor make it work again? [closed]
For several months now I've had trouble getting my AC adapter I use to charge my laptop to work. It's one of those typical looking things, with two ends and a big bulky rectangular thing in the middle....
0
votes
0
answers
298
views
Build 100-240v Power Adapter
I am trying to power a 5v circuit from any voltage between 100-240v. I know it is possible to do this with a transformerless power supply, but only for a single voltage (e.g. 120v only), but how do I ...
- 11
0
votes
2
answers
104
views
Is miniaturization of office device A/C adapters feasible?
Today I looked upon my desk: as you can see in the screenshot below, there are three plastic boxes containing A/C adapters for (I think all in the 12-20V and 1-2A range):
screen device
notebook
...
- 101