All Questions
12
questions
6
votes
2
answers
1k
views
Is an AC/DC converter with no visible fuse before the transformer inherently dangerous?
I've been using a generic, unregulated mains AC/DC converter (wall-wart) for a very low-power project. It's output was a bit prone to 50 Hz ripple, so I opened it up to investigate how the circuit ...
- 657
-1
votes
1
answer
154
views
AC-DC Schematic - Is this a Death Capacitor [closed]
Is this a death cap? I think it's not a death cap because it doesn't connect to the DC ground, but I'm not 100% sure.
Image Source: Hi-Link HLK-20M24 Datasheet - https://www.rhydolabz.com/documents/...
- 133
0
votes
1
answer
75
views
What fire tests are done on power adapters/chargers?
I was curious about the fire risks in using a typical AC-to-DC wall adapter
(e.g., this)
and went to the UL website
to learn what exact tests were done to get the "UL LISTED" stamp,
but I ...
- 554
3
votes
4
answers
1k
views
How to protect a power supply
Enthusiast here, with no particular electrical engineering knowledge.
I have ordered a power supply, similar to this one in the way it is built:
Here are the specs:
Input is 230V AC
Output is 48V DC ...
- 139
18
votes
3
answers
5k
views
Does this AC to DC + breadboard setup have the ability to kill/severely hurt me?
I'm currently building a PC peripheral that uses an AC to DC converter to power a set of DC fans. I'm not a trained EE or electrician, so I want to make sure I'm not putting myself a risk with this ...
- 285
2
votes
4
answers
767
views
Limits to use an off-the-shelf grounded AC-DC power supply with a two-prong cable
We are selling a product using an AC-DC power supply manufactured by CUI INC (SDI24-5-U-P5 datasheet). We sold the product in a few European countries but we are currently talking with a new ...
- 336
0
votes
1
answer
174
views
Protection circuitry for AC/DC converter
I'm using the RAC02-GB (Datasheet) as an AC/DC converter and I'm confused about the protection circuit they included in the datasheet:
I want to make sure the AC/DC converter has the proper external ...
- 491
2
votes
2
answers
184
views
What are the safety and device risks associated with not connecting the grounding prong on a 120V AC device?
For example, imagine a device that comes with a 3-prong (grounded) AC plug. What are the risks associated with, for example, plugging this device into a 2-prong extension cord which effectively ...
- 539
2
votes
2
answers
1k
views
What are design considerations for grounding an enclosed AC-to-DC converter?
Here I'm talking about a device that takes 100-240V AC in, and outputs 10-20V DC out. In terms of grounding, I'm referring to the grounding offered by a standard outlet (e.g., a NEMA-5-15R receptacle)....
- 539
0
votes
3
answers
30k
views
220 AC to 220 DC Converter
I am designing a circuit that will give me an adjustable 220DC voltage. The load is approximately 2kohms, so the maximum current that will flow is 100mA.And I have design restrictions, it needs to be ...
user86045
1
vote
4
answers
5k
views
Can a current be induced in an HDMI cable that runs parallel to a 120v AC cable for 15 feet?
I just went to go unplug an HDMI cable and got shocked from the end of it! The only possible causes of this that I can think of are that the receiving or sending end of the long (50ft) HDMI cable is ...
- 25
9
votes
8
answers
9k
views
Is it safe to use a DC power adapter that isn't UL Listed or CSA certified?
I picked up a 9V switching DC adapter from SparkFun a while back, but I've been hesitant to use it because it doesn't have any of the usual "safety" approvals that you normally see on power adapters (...
- 215