Questions regarding the safe and effecient design and implementation of AC voltage to DC voltage supplies. Typically Mains to some lower DC voltage.

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1answer
177 views

Does a bridge rectifier care that much for AC frequency?

As I understand it, a bridge rectifier is a set of diodes that play a trick of logic that keeps the polarity positive. So, within the context of a household DC transformer does it matter what the ...
1
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4answers
138 views

Powering 28 LEDs in series by 220VAC - simple stabilizer

I have a home-made thingy that I would like to use as a lightning in my living room. It contains 7*4=28 LEDs (red, 1.86V, ...
2
votes
3answers
77 views

AC adapter: Input power vs Output power

When I look at, let's say an iPad AC adapter, the input/output rating on the charger states: Input: 100-240V 0.45A (AC) Output: 5.1V 2.1A (DC) I know that the ...
1
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3answers
77 views

Picking an AC-DC Converter to Minimize Cost [closed]

I'm trying to design an AC/DC converter to implement into a project I'm working on. The project needs to be isolated from mains and shouldn't require more than 1A at 5V. My question for you is what ...
1
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2answers
113 views

Thinking about LED light bulbs..as full wave rectifiers

Tw questions on LED bulbs. First Qt: Just something I was wondering. Since LED's bulbs are, by definition rectifiers ( I believe they are full wave) would it be possible to use them as such by putting ...
-2
votes
1answer
95 views

How can I create a bridge for 230V to 12V DC with 1 amp? [closed]

I am new to electrical. I would like to know how I can create a bridge for 230V to 12V DC with 1 amp? I searched Google and I got results but I am confused about what type of diode I need to use and ...
0
votes
0answers
47 views

Is it okay to rapidly switch on and off a DC adapter

I have a thermoelectric coller I've converted to a heater which I usually use a normal thermostat to control. I've just upgraded to a PID-based controller which of course is going to be switching ...
3
votes
2answers
200 views

Why have atx power supplies need selector voltage?

I am studying various ATX power supplies schematics and don't understand the need of the voltage selector as switching power supplies work at range of voltages. In most schematics i see the 110V line ...
0
votes
1answer
55 views

Wiring different DC voltages to use 120V AC

I apologize in advance if this is simple. I've only had an intro to circuits class and all we did was analyze existing circuits, and even that's been a while. For a design project I'm trying to wire ...
1
vote
1answer
149 views

Can I use the output of mobile charger as a DC source for my circuit?

The title explains it all. Can I use the voltage and ground pins from the mobile charger and use it in my breadboard circuit? Is it safe? If it isn't, what is the thing I need to buy so as to convert ...
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votes
6answers
515 views

How can I run a 7.2VDC battery-powered drill off a 220VAC wall socket with limited part availability?

I have a battery drill, but the battery is useless, so I want to power direct from the outlet. I need convert 220VAC to 7.2VDC @ 4A. I can't use a transformer because the high output current, it ...
0
votes
1answer
277 views

Step-down transformer AC to DC voltage conversion problem?

I got a step down transformer from an old black and white CRT TV that is about 18v 0 18v, 10A AC current output. I wanted to convert AC to DC, so used four 1N4007 diodes as a bridge rectifier. When I ...
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votes
2answers
83 views

which ac-dc adapter work with my device? [duplicate]

lets say I loose the acdc adapter of a device, like a laptop or a wireless router, how do you know that another adapter will work with my device? my assumption is that I have to match the same voltage ...
2
votes
2answers
1k views

Making 12V DC from 6V AC

I've got a 1980 Honda XL 185s that has a 6 volt electrical system. The headlight uses a 6V AC, 30 watt bulb powered from the generator. The other lights (tail, blinkers) operate off of the 6 volt ...
3
votes
1answer
189 views

12V 1A DC input filter

I have to design a power input filter of consumer device. It is powered with desktop AC/DC 12V power supply. Max current consumption - 1A. Device has a full metal enclosure. I am considering putting ...
-3
votes
2answers
124 views

convert ac to dc circuit [closed]

I want to build real circuit, which converts AC signal to DC. AC signal looks like below: Its period T is about 2 seconds. At the output I want to get DC as shown in the right graph with voltage ...
2
votes
3answers
333 views

Can I use a 3-wire AC adapter in a DC circuit?

I am reading through the excellent book Make Electronics and am in a chapter that suggests getting an AC adapter, cutting off the connector at the end and stripping the rubber outer coating back to ...
0
votes
0answers
78 views

power supply for 12 volt impact wrench

I want to power up a 12 volt impact wrench (without a car) using the right ac / dc converter but the device reads "13 amp max current"... Should I go with a 13+ A power supply, or I can use this 8.3 ...
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votes
2answers
309 views

DC Adapter on AC Adapter Speaker [closed]

i've Speaker with woofer requiring AC 12 voltage, and i have DC 12 voltage Adapter. However, speakers are working properly. but Can i use DC 12 V Adapther with the Speaker which is requiring AC 12 ...
0
votes
1answer
131 views

Is there a prebuilt PCB that does the equivalent of a wall wart for a similar price?

I am working on a project, and I need to convert 240V AC power to 5V DC to power a microprocessor. I can't use a wall wart, and I am looking for a PCB that will do the same as one - for near the same ...
1
vote
0answers
183 views

Reading a smoke alarm interconnect signal

My place has a few 120v AC powered smoke detectors (each with a 9v backup battery). They are "interconnected", meaning when one goes off, they all go off. According to this page, they communicate by ...
28
votes
2answers
703 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 ...
4
votes
2answers
1k 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
455 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
566 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
78 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
184 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 ...
10
votes
3answers
10k 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
2k 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
390 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 ...
4
votes
2answers
981 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
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2answers
294 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 ...
7
votes
7answers
1k 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 ...