Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [ac-dc]

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

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

Not about the band of the same name.

435 questions
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4 answers

What is the Zener diode doing in this 123V supply?

We are fixing up an old Atari game cabinet, and we keep blowing the Zener diode D802. This is a 51V zener diode, but we don't understand what it's doing and so we can't figure out what is causing it to be overloaded. The concept of operations for…
Kenn Sebesta
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AC/DC converter problem

EDITED to update diode spec and schematic... I have two failed outside security lights each with PIR circuit with relay to switch 240V AC mains voltage to another circuit which looks to be a simple AC/DC converter which then feeds a matrix of 60…
MisterSquonk
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Splitting a 10amp 2.1mm DC barrel into positive and negative

I have this AC to DC converter and I want to be able to split out the positive and negative wires from the barrel without cutting off the barrel. I've been looking at options such as this jack to terminal screw adapter, but I don't think it is rated…
Matt
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Half wave rectified average output power

In the highlighted portion for the AVERAGE power, why did he use the DC RMS output voltage and not the DC AVERAGE output voltage? Do we ever use the DC AVERAGE output voltage for finding power? SOURCE: Power Electronics Daniel W. Hart published by:…
OMAR
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How to hook a transformer to a outlet

I bought some plug ends to hook up to my outlet I wanted to connect the plug with some wires, I was told that I needed these type of wires I however wanted to use low voltage wires like these It will be hooked up to a transformer that will output…
Thedagz
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1 answer

Simplest AC-DC: charging capacitor at needed AC input voltage

To implement a simple AC mains input circuit to charge a capacitor with low voltage DC I think that it should be possible to connect the output capacitor to the AC line through a diode, and a transistor which will disconnect the capacitor from AC…
Roman Matveev
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AC DC circuit mixed. Voltage at a point

I'm Computer Science student and I'm having a hard time understanding this task: Answer is: Va for DC = 0V, Va for AC = -1 - 3j Vb for DC = 4.8V, Vb for AC = 1 - 1j I have a couple of questions considering this circuit: What does "voltage at a…
KVASS
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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 together (theoretically, not in practice) 4…
John North
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1 answer

How to convert 240 V single phase to 300 A 12 V DC

Residential situation with mounted 2-ton hydraulic 12 V crane. Have 120/240 available, need to create 12 V 300 A available power for intermittent use, boat launch. Average power used 150 A 12 V DC, with peak at 300 A very occasionally. Loads…
Brad R
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Compact on board AC to 5VDC converter

So I'm playing around with an idea, but I'd like a good, compact way to power it. In the past I've used old wall warts to provide the power. Just find one with the power output I need, solder the AC power to the plug with some heat shrink tubing to…
AndyD273
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Will transformer work with lower voltage?

I'm looking for a way to convert 8VAC to direct current. I found a converter that can convert 10V~20V to 12V3A. Will the converter work when I input it with 8V? And how much output voltage will be generated? It the Szduli S3-A121203. 36W AC-DC…
JimmyD
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Need an AC to DC converter and have two input options (16 VAC or 120 VAC). What are tradeoffs using a lower AC voltage vs the higher one?

I'm starting a project to replace an incandescent lit house number sign with one lit by an LED strip. I'm using existing wires and plan to do AC to DC conversion in the basement (3.3 VDC or 24 VDC--TBD, but most likely will be 24 VDC). The total…
Adirondack Jim
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which ac-dc adapter work with my device?

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 and the amperes have to be equal or higher than…
user1006274
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convert ac to dc circuit

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 12V and current is 2.1A to get power 25W. Can…
Nurlan
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Does anyone know an alt code for ac/dc - Alternating Current (AC) Direct Current (DC)?

I have been trying to find an alt code for the ac/dc symbol, but have not found one or a way to suggest it.
Gwen Arms
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