The ac-dc tag has no wiki summary.
26
votes
2answers
455 views
If we could start our electrical grid from scratch with today's technology, which would be the most efficient choice? AC or DC?
Lately, I’ve been reading about the many advantages of HVDC transmission systems for long distance transmission, undersea links, and others. The historical reason of why AC was picked over DC was ...
3
votes
2answers
123 views
Converting universal AC to 3.3v DC @ 0.1A
There's a bunch of topics around this but i haven't found something that fits my requirements. I'd imagine this is a fairly common thing though so any pointers would be appreciated
Basically i want ...
-1
votes
2answers
132 views
Smallest AC to DC converter [closed]
What is the smallest cheap AC (110v) to DC convertor available for Arduino. I want this to be embeddable in a box along with Arduino without taking more space.
Thanks in advance
3
votes
3answers
224 views
BJT Pre-Regulator
I have a circuit that has an input of 35V peak and I would like to drop the voltage down to 5V 200mA. I was recommend to use a pre-regulator in the following configuration:
The good thing is that ...
0
votes
0answers
55 views
Where can I find a small wall outlet feed through?
I am looking to make an aluminum box that contains an AC/DC converter to protect the wires, but I need to be able to plug in a regular AC wall outlet cord to the box itself (to go through and bring ...
2
votes
2answers
128 views
Electrical circuit / transformer in series?
I would like to pull out 5v 3A max in series from an already existing connection from the mains 240v 40A connection.
Current circuit:
What I would like to implement:
What are the possible ...
7
votes
2answers
961 views
Help me understand the relationship between positive, negative, neutral and ground in AC and DC
This question stems from notations on schematics and seemingly conflicting information I'm seeing. I suspect that I'm seeing different vernacular for the same concepts--but I'm in a place where no ...
1
vote
2answers
526 views
How to use a transformer to power a 5V chip (an Atmega328)?
I am designing an Atmega328 based device which needs to be powered directly from 230V AC. I have found a transformer in my local electronics store which seems perfect, but I have never worked with ...
0
votes
4answers
238 views
Dual AC feed to power a DC unit (Raspberry Pi) with Diode and Polyfuse for protection
I wish to place some Raspberry Pi's in remote locations (data centres) for telemetry and other services like serial OOB access.
Typically dual AC feeds are presented to customers in a data centre ...
3
votes
2answers
343 views
Calculating the True Power Factor in non-linear loads
In my circuit I am taking in 60 Hz 120 VAC from the power company and hooking it up to a AC/DC non-linear switching buck converter I am designing.
I know that:
true power factor = (displacement power ...
1
vote
2answers
174 views
Is PFC compulsory for AC/DC converters 75W and above?
I’m reading the user guide for a Microchip reference design of a 300W AC/DC converter. Section 1.2 starts with these requirements:
A conventional SMPS must implement PFC if it draws more than 75 ...
