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39 Threads found on 220v To 5v
First of all, this is not safe. Anyone unaware of this, could inadvertently plug some device into this connector thinking it would have 5v, and would get surprised in the worst way to find out that it has 220v. Moreover, certainly the insulation as well as the clearance of the terminals are not suited for this voltage level, neither to the electric
The output of the bridge rectifier is pulses with 0V between them. A 7812 voltage regulator will not work properly when fed pulses because it has a minimum input voltage rating of +14.5V. So the rectifier must be filtered with a pretty big capacitor which increases the high DC voltage to near the peak voltage of the 220vAC which will be about +309V
Err, yes, it all depends on the relay design, if you want to switch 5 KW @220v with a 5v 20 mA relay then a slave relay would be required. Frank
No pins of 8051 can accept analog voltages. So you need an adc converter. If it is a matter of reading the applied voltage only, then why don't you rectify the supply. This way you can rule out the negative half cycle... Use a rectifier & a good filter, convert it in dc, read through adc, multiply by 44( if step down is 220v - 5v) & divide by 1.414
You need to use resistor for diode to limit current. Maybe you kill diode, replace opto triac. Check code. First check optotriac with 220v load only with 5V source without uC. Use power source of 5V and 220v for optotriac led.
I need a circuit to convert the 220v ac to 5v dc. 1. Is there any better alternate for changing the level of voltage instead of transformer? 2. I need a very smooth dc. (No matter how big the circuit would be!) 3. what should I consider for Impedance matching? Simplest would be to use a 50Hz transformer to ste
Is this for your vehicle? You may want to investigate something like raspberry pi, which can operate from 5v. Otherwise, I'd suggest that it is quite hard for someone new to electronics to develop a PC power supply that operates from 12V. There is the inverter option to take 12V and convert to 220 so that you can power a conventional 220v PC power
Hello , Can anyone tell me how does the following circuit work? 7627176271 Attachment 76025 i've used it in a project's power supply to convert 220v AC to 5V DC for use 5V DC to ATmega16 and servo motors , (ATmega16 and a servo are connected parallel) ; will the parallel connection
I want to make multiple output smps to submit as my institute project.. i want its circuit diagram. Input : 220v Output: 5v,9v,12v,24v
Dear all Can i down the AC voltage from 220v to 10 volt without transformer, Is there any device make this function? thanks in advance.
why bother to build one ? buy a ready made they are so cheap. 5V 2A Regulated Switching Power Supply (110~220v) - Free Shipping - DealExtreme
Hi, The nominal coil voltage is 1.5v, which according to the datasheet has a max of 3V for a DS2E-S-DC1.5V; the contact or switched voltage has a max rating of 220v DC or 250V AC. These are two entirely different entities.
Hmmm.... the idea is correct but the implementation is flawed. To reduce the power you need to drop the voltage by a factor of (3500/4000) or 0.875. The 220v therefore has to be dropped to 192.5V The resistor has to drop the voltage so with 220v at one end and 192.5 at the other end, it must drop 27.5V The value needed to do this at a current o
Hello All, I am designing a project with which I can control a 220v low power load (small light bulb or small fan) with the signal from a PC parralel port such that when the 5V from the PC parallel port is off, the 220v is shut off from the device and vice versa. For now, let's assume that I have the 5v control signal ready from the PC. 1) Wha
Hi there, can anyone give me a solution (circuit) for transforming a variation of 220v AC ? 10% into a variation from 0 to 5V ? Thanks in advance. -SQD-
Hi every one !! I want to design a circuit ( input 220v AC, output 13.5V Dc ) to charge for battery 12V Dc 100Ah using SMPS (boost mode ). I need some idea to do it . And i need some fomule to calculate SMPS transformer in this case ? Thanks !
hi, plz help me with the design of a step down transformer 50Hz, 220v AC - 5V AC, i = 0.5A, with high efficiency, plz its urgent, so desperate. tnx
Hi, I want to design a fly back AC-DC Converter to supply a set top box... In input I have Vin = 220v. In output I need to have : 12V, 5V, 3.3V, 2.6V, 1.1V and 1V. Please could you help me with some reference design or some ideas. Regards, Titou.
It depends on the application. If the 220v is AC mains, the current is low and you don't mind the health risk, you can do it with two resistors. Otherwise I would suggest a 220v to 5V transformer is the best solution. Brian.
configure pic adc input with vref=2.5V as u say the input signal is varying u can have a 1Mohms resistance before the pin to scale down the voltage if it is AC 220v use a 6Mohms resistance
Of course, they using a technique with switches, and then averaging the output. We were doing this is my previous company for the AC-DC converter, which would convert 220v to 5v. Cannot exactly remember what the name was, but google it.
Is there any criteria to make the DC voltage choice in the presence of many supply voltage in the electronic cart? For example: supply voltage: 12V ; 5V ; 3.3V ; 1.1V ; 1V For the AC voltage : 220v So what supply voltage should I choose for the first conversion? 220v/ 12V or 5V or 3.
Hello, I wish to make a cheap ZCD for 220v AC Mains lines. This is require for my isolated TRIAC firing. I would require the output of this ZCD to be in 5V range and it should be able to detect both rising and Falling edges. The PC817 Solution is elegant but requires 2 circuits to make a full detection. If there is some thing possible to do w
Hi, I have a board with PIC186722. It works OK, but when I switch on some 220v lamps near by sometimes it freezes. I tought I should put on an LC filter to eliminate these spikes, but will this help? I am using the USB's 5V (and external 5V if it's not connected to the PC) and it's regulated to 3.3V with LT1763 (I tried with MC33269D-3.3 t
any have a schematic for 220v to 5V 1A supply using simple smps? You could use a transformer to get AC 6~10V,and then rectify it with diodes and RC circuits. PLs refer to a primary electronic book.
Hi, there, Would you tell me which eda tools I can use to design a flyback converter IC(~220v to 5V/3A)? Any advise for me? How to deal with the transformer? Thank you!
I want my Microntroller circuit to start working (Get 5V VCC) when a 220v AC Supply in another circuit is turned of.. Like, if a machinery operating under 220v AC is turned off, my microcontroller should start working... i.e. it should get 5V What kind of relay should I use? I havent used Relays before, so i have no idea of how to use them..
hi all i am designing a fan speed controller using 2051 and single seven segment display . since the circuit needs to be smalll ,i want to cut short the power supply components.i want to make a power supply using resistance and capacitor ,diode. i want to derive 5 volts from 220volts. can anybody please give me the circuit idea for this power supp
how can i connect BUZZEER 220v with alarm clock that turn on battery AA 1.5v please when the alarm clock ringing(small motor switch on) must the BUZZER 220v switch on it's for wake up to university :cry::cry::cry::cry::cry::cry::cry::idea::idea:
how can i connect BUZZEER 220v with alarm clock that turn on battery AA 1.5v please when the alarm clock ringing(small motor switch on) must the BUZZER 220v switch on :idea:
Because of the low voltage (1.5V) your options are very limited .. Maybe you can use an optocoupler, for example the MOC3021 - with the emitter's input forward voltage of just ≈1.2V, and to drive a buzzer of 220vac use a triac .. see picture below .. Regards, IanP
It is a "flyback-converter" circuit that converts AC to DC in TVs.This circuit is called "switch mode power supply" which is different from linear this circuit there are a transformer,capacitors,resistors,diodes and transistors.They convert 220v AC to 120V,40V,6V,5V...DC whatever you depends on the ratio of N2/N1 of transform
Hi everybody, I need some help, I need a capasitive circuit that converts 220v AC -to- 5V DC . Can you help me finding this? Or can you give me an idea to construct the circuit? Thanks a lot..
i have a problem with the (0V - 220v)analog input of the DSO.. i need to minimized/attenuate it to 0V - 5V... what viriable gain amplifier or programmable gain amplifier would you recommend
I build simulation model of an sigma delta modulator (analog input digital output) in order to control transistors in 3phase full bridge resonant inverter. In negative feedback loop I have 1bit D/A converter and it gives +-5V. Reference voltage is 5V*sin(2*pi*50Hz*time). I couldn't rise this voltage at 220v because of op amp input is max 30V (V+ -
I want to get 3 power supply 5v/2A, +15v/0.3A, -15v/0.3A from ac 220v. I think I should use transformer first(tranform to 15v or 5v?), and then rectify it. And then what should I do? and which regulator could provide 5v/2A? Thanks. Yes you need a transformer. To at least 15 not 5volts. Unless from 5volts you want to go back
Hi, Need an interface that gives me a steady 0 with 220v in and a steady 1 without 220v in using a 4N25 or TIL111 or any other opto that gives galvanic isolation. Thanks, Fernando
Hi everyone I am doing a system including a motor and I am using 220v AC relays and AY89C52 to control the system. Everything was going fine until I connected the microcontroller circuit with the relays as when the relays are switched on or off they reset the microcontroller circiut.
I don't trust 220v 50 hz triac/resistor to common DC elektronic/Processor. If I where you use the optoswitch, to isolate AC/DC!!! Thats just mine opinion. I'm sure there is another way. But I think this way is simple and secure!!!! That's just my words.. //BoNe