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.
233
questions
0
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0answers
33 views
Astable 555 used for AC to DC Halfwave to DC stable conversion, is what I have done correct?
I have this falstad-circuit:
And here it is per request, as a SCH file screen:
I'm trying to use a 555 astable to convert a variable AC with maximum of 12V (coming from Bicycle Hub) to 8VDC, ...
0
votes
0answers
38 views
Use Triac as SMPS to get DC voltage
I want n 12V 1A supply for a project. I want a transformer-less topology.
I was reading and experimenting with readily available traic based dimmers. They use phase control to cut the input voltage ...
1
vote
2answers
102 views
How to find the right smoothing capacitor for rectification circuit
I am creating a power supply which will need to convert the 24vac to 5vdc. I am thinking of using a rectifier to convert ac to dc, then a capacitor to smooth out the voltage, then an LM2596-5 to drop ...
-2
votes
0answers
53 views
Power Factor Correction: Facing a trouble while converting AC to DC
I am Designing AC to DC power supply.
For Power Factor Correction I am using LT1248 from Linear technology, It works in Boost CCM operation, and the schematic is designed for 400VDC output using ...
3
votes
3answers
226 views
Why aren't non-isolated DC-DC converters made for high wattage applications?
I am new to electronics. I am presently studying DC to DC converters.
One thing I noticed is that most of the people are using isolated stepdown converters like half bridge, full bridge, or resonant ...
1
vote
1answer
58 views
(230v)AC-DC(12v) wall adapter flashes when connected to dc to dc buck converter [closed]
So I used a common 230vAC to 12vDc (1AMP) wall adapter with dc jack like this
and converted to 5v using a dc to dc buck converter same as based on lm2596s
But the adapter LED starts blinking (...
0
votes
1answer
50 views
SMPS 5V without load, fluctuation on load TOP258PN [closed]
I am using PI Expert Online (this) to design a smps circuit for 5V, 2.5A output. I already have TOP258PN IC with me so built circuit for that.
Change from schematics: I am not using choke and using ...
4
votes
4answers
353 views
Is DC-to-DC (24 V to 12 V) buck conversion typically more efficient than AC-to-DC (110 V to 12 V) conversion? [closed]
While building an online UPS system, I'm basing the choice to eliminate as many AC inverters from the system as possible because of the assumption that DC-to-DC conversion is more efficient than AC-to-...
2
votes
3answers
101 views
Please help me understand how to add AC power to my DC device
I have a device that runs off of three D batteries. I would like to be able to add a power cord so that I can plug it into the wall and run it off of that instead. I would also like to still be able ...
3
votes
1answer
75 views
Different Wattage Solar Panels for Home [different Voltage/Ampere]
My current solar system for home
12V 100W polycrystalline Solar Panel.
12V 75Ah Lead Acid solar tubular Battery.
PWM 12V 10A Solar Charge Controller.
12V Input and 200VA Output Inverter.
Current ...
1
vote
2answers
111 views
Power drop on AC-DC converter due to relay
A uController circuit is powered with an AC-DC converter. This circuit in turn acts on some relays to turn on and off some loads. We have two bi-stable relays and another simple relay (Omron G5DN-1A) ....
2
votes
4answers
157 views
300VDC to 24VDC voltage converter - Cheapest implementation
In an application, 100+, 100W 24V halogen lamps need to be individually controlled and run simultaneously. They stay on for a few seconds at a time and need to have very constant irradiation.
...
0
votes
2answers
60 views
How to insulate DC from earth noise while keeping it referenced to it
I have an AC/DC converter (220 to 24) inside an electrical cabinet. The 0VDC is referenced to earth, like this (couldn't find a symbol for an AC/DC converter in the schematic editor so I made a dirty ...
1
vote
2answers
80 views
AC “chopping” power supply inrush current problem
I've made a simple AC to DC chopping/switching power supply circuit (I'm not sure if it's called that) as shown below. in the left part of circuit (which is the gating/chopping part) when the ...
0
votes
2answers
68 views
3.3v Powersupply
I have been needing a 3.3 volt power supply that can use at least 12-24 volts ac dc in. I have looked online and managed to make this schematic
but I have no idea if it works.
I was hoping if you ...
0
votes
1answer
107 views
Why would this Class D Audio Amplifier have low current draw?
Disclaimer: Saying I have very little knowledge of electrical engineering theory is an overstatement. I very much appreciate your help and patience. I'm not finding any questions similar to mine, but ...
0
votes
1answer
233 views
Is it safe to use a 19V DC adapter for a 12V input if it can provide enough watts? [duplicate]
I have a small TV which expects 12V DC at 34W. Can I use an adapter with a higher voltage rating (19V for example) as long as it can provide enough amps to satisfy the amount of watts needed by the TV?...
0
votes
2answers
112 views
Am I safe working with a power supplier of 12 DC connected to the AC wall socket main line?
I'm working on an electronic home experimental project. But
I have always been afraid of the issue of electricity since it can electrocute.
My question is.. Am I safe working with a power supplier ...
0
votes
2answers
72 views
Transformer in 127V AC - 5V DC Converter
There is a transformer in this 127V AC to 5V DC Converter. I am trying to get one of them. But I don't know what kind of transformer is and I am unable to find it in my city.
Also, it is so small. ...
0
votes
0answers
37 views
SMPS topology for combination of current controlled rail and fixed voltage rail
I'm looking at designing a LED driving power supply that can interface with a universal AC main input (~90VAC-260VAC) and produce 2 rails at the output; one a current controlled rail, and the other a ...
0
votes
1answer
49 views
How do I choose appropriate fuse for my circuit?
I am currently using a AC-DC adaptor with specs:
AC-I: 100-2040V~50/60Hz 1.6A
DC-O: 12V 5A
Which is powering up 8 DC motors,
4× 12V 6W
4× 12V (wattage not specified, the motor is meant to be ...
1
vote
4answers
134 views
How can I run my e-bike wheel on AC power?
I have an electric wheel designed for an electric bicycle conversion. By my understanding, the wheel is essentially a 48V, 1000w rated brushless DC motor. It comes with a thumb throttle and kill ...
0
votes
1answer
136 views
Gigabit detection DIY
Ethernet up to 100Mbps uses only 2 of the 4 twisted wires in an ethernet cable while gigabit is using all of them. Connecting an LED to one of the gigabit-only pairs should therefore make it easy to ...
1
vote
0answers
116 views
Reducing AC/DC adapter (SMPS) output voltage
I have a AC/DC adapter P-1650-22 (used to power a notebook) laying around.
I would like to use it for other purposes, i.e. as a constant voltage source for LEDs.
The problem is, that the output ...
2
votes
4answers
164 views
Converting Christmas Village from DC to AC
So this was the year we bought a AC-powered O-gauge Lionel train and a battery-operated village to add to our Christmas tree decor. The problem, the village eats batteries like a kid eats cookies.
...
0
votes
2answers
72 views
Is Cadence unable to simulate AC to DC converters using simple full bridge rectifier?
I've tried several different topologies, such as the full bridge rectifier and the following which I've successfully tested on other simulators.
However, on Cadence I always end up getting static ...
0
votes
1answer
159 views
What components do I need to add to the power circuit for this ESP8266 project?
I'm planning to make some controllers for each of the electrical heaters in my house. The heaters use a pilot wire to control their mode of operation:
I'm following this project to control the pilot ...
0
votes
2answers
81 views
Design an AC/DC Nonisolated Switching Mode Power Supply
I'm designing a fifth generation pcb for my project and yet I stumbled across another design problem. First of all, the circuit and all components are enclosed from the environment and users (because ...
0
votes
1answer
53 views
What is the best starter adjustable power supply for pretty cheap (preferably ac/dc) [closed]
Please I am just a kid no $8953739857239875 power supplies. Btw I am an inspiring electrical engineer and I'm 10 so I need a bit of help so I don't how do I put this nicely, ahem trip the breaker if ...
2
votes
1answer
339 views
Function of the Third Pin Inside Laptop Barrel Connector
So I've been doing research on barrel pin connectors, and have been trying to apply this knowledge to understand laptop barrel connectors, specifically. My confusion relates to the function of the ...
0
votes
3answers
80 views
Changing AC amplitude and frequency
I'm working on a project for school to monitor a 6 and 15 VAC signal coming in at 11KHz for both. I'm trying to find a simple way of recreating that at home for running some tests on circuits I'm ...
0
votes
1answer
48 views
How to size transformer for a circuit?
I am using a 5 Watt PCB mount AC/DC power module with universal input(85-264 V) and output as 12 V. The cost of the module is very high so thought if we could replace the module with a PCB mount ...
0
votes
2answers
135 views
What should I buy to test whether my DC power supplies are able to provide their rated power? [closed]
I recently bought an aftermarket AC-DC power supply for a laptop which was woefully defective. When connected to a Chromebox, a boot message appeared indicating that the supply could not provide ...
0
votes
2answers
181 views
DIY electromagnet using copper wire and AC adapter
I want to make for some demonstration (caching some paper clips on ON and doping them on OFF) electromagnet made from copper wire (should it be single wire?) with ferromagnetic inside coil:
As power ...
0
votes
1answer
102 views
Simple AC to DC converter: upper limit for the capacitance of filter capacitor?
By 'simple AC to DC converter' I mean the familiar circuit shown in the figure below, where the capacitor C reduces the ripple.
A sufficiently large capacitor can be used in order to reduce the ...
0
votes
1answer
43 views
Non-isolated DC power distribution for an appliance
I am building an appliance where we have a device where we need to have a +48 V/300 W DC power rail and a +24 V/300 W DC power rail. The AC (mains) should be world-compatible (both low- and high- ...
0
votes
1answer
62 views
About Ac to DC convertor..? [closed]
Which is the best way to convert Ac to DC , with maximum efficiency possible by using a transformer.
The required voltage is 5v and current is 1a .
I saw a circuit from my mobile phone charger they ...
0
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0answers
39 views
Fuses on both lines of an isolated AC/DC converter
I'm redesigning a board made from another person. This board have several AC/DC converters (like Traco TMP07 Series and similar) and some screw connectors to connect external devices. Neither the ...
-1
votes
1answer
68 views
What products can be used power LEDs from an wall outlet? [closed]
I am currently working on a project that will be a type of night light that plugs straight into a wall. What parts can I use to convert the wall outlet voltage into that which can be used by a couple ...
0
votes
2answers
64 views
What is a Kva in simple terms, for somebody who doesn't know electrical engineering?
I have a DC circuit that runs on 8.1 A × 12 V (97.2 W). Power is supplied from a AC-DC transformer that plugs into a socket.
How many of these can I run in a place that provides a maximum of three-...
2
votes
2answers
74 views
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 ...
0
votes
1answer
60 views
ATX 12V power supply fan required or not at low current?
Does ATX power supply really need its cooling fan when drawing only 3A at the +12V rail? I know that the fan is mandatory when it's running a computer that draws 200 Watts and above but is the fan ...
6
votes
1answer
727 views
Replace x2 capacitor with polyfilm? [closed]
I have a 12 V power supply that's not working anymore, so I opened it up and checked for faulty components with a multimeter, and I found two of them so far. One was a 1000 µF 25 V electrolytic which ...
2
votes
2answers
146 views
Limiting Inrush on AC/DC converter
I created a simple power supply as shown below that results in an unregulated 50VDC which is what I desire. The transformer is rated for 1000VA. It works ... but only if you're lucky enough to turn it ...
0
votes
0answers
106 views
Need help selecting a transformer for an AC/DC converter
I'm working on a pinball project that requires a 50VDC voltage to drive solenoids. The biggest load comes from the flippers (which both could be activated simultaneously) however it's possible for ...
0
votes
2answers
190 views
0
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1answer
369 views
Understanding LED driver circuit AC to DC conversion
I am recently working on mains socket outlet type LEDs lights. They all have very similar AC to DC conversion circuit.
simulate this circuit – Schematic created using CircuitLab
C1 is a X-2 ...
0
votes
2answers
557 views
How to design a AC-DC circuit using only the hot/live wire has power input?
I was looking at these new IOT devices coming from CN that are designed to replace your standard wall switch with an ESP8266 smart-switch.
It seems there are two types: A) the typical one where the ...
0
votes
1answer
424 views
N-Channel Mosfet has full Voltage on all Pins (IRFZ44N)
I recently wanted to use a IRFZ44N N-Channel Mosfet (up to 50V) to control a 50 LED Panel with a current of 35V.
The Panel itself uses 230V AC which goes to a rectifier (?) which outputs 35V DC and ...
0
votes
1answer
56 views
DC signal to Integrated signal
I'm so new in analog electronics. So I stuck with one issue. Let's say I have an input signal, like blue one:
To get a DC form I can rectife it (got a grip on it). But what I need is a smooth(...
